code:
# memchr.m4 serial 8
dnl Copyright (C) 2002-2004, 2009-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN_ONCE([gl_FUNC_MEMCHR],
[
  dnl Check for prerequisites for memory fence checks.
  gl_FUNC_MMAP_ANON
  AC_CHECK_HEADERS_ONCE([sys/mman.h])
  AC_CHECK_FUNCS_ONCE([mprotect])

  dnl These days, we assume memchr is present.  But just in case...
  AC_REQUIRE([gl_HEADER_STRING_H_DEFAULTS])
  AC_CHECK_FUNCS_ONCE([memchr])
  if test $ac_cv_func_memchr = yes; then
    # Detect platform-specific bugs in some versions of glibc:
    # memchr should not dereference anything with length 0
    #   http://bugzilla.redhat.com/499689
    # memchr should not dereference overestimated length after a match
    #   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=521737
    #   http://sourceware.org/bugzilla/show_bug.cgi?id=10162
    # Assume that memchr works on platforms that lack mprotect.
    AC_CACHE_CHECK([whether memchr works], [gl_cv_func_memchr_works],
      [AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <string.h>
#if HAVE_SYS_MMAN_H
# include <fcntl.h>
# include <unistd.h>
# include <sys/types.h>
# include <sys/mman.h>
# ifndef MAP_FILE
#  define MAP_FILE 0
# endif
#endif
]], [[
  char *fence = NULL;
#if HAVE_SYS_MMAN_H && HAVE_MPROTECT
# if HAVE_MAP_ANONYMOUS
  const int flags = MAP_ANONYMOUS | MAP_PRIVATE;
  const int fd = -1;
# else /* !HAVE_MAP_ANONYMOUS */
  const int flags = MAP_FILE | MAP_PRIVATE;
  int fd = open ("/dev/zero", O_RDONLY, 0666);
  if (fd >= 0)
# endif
    {
      int pagesize = getpagesize ();
      char *two_pages =
        (char *) mmap (NULL, 2 * pagesize, PROT_READ | PROT_WRITE,
                       flags, fd, 0);
      if (two_pages != (char *)(-1)
          && mprotect (two_pages + pagesize, pagesize, PROT_NONE) == 0)
        fence = two_pages + pagesize;
    }
#endif
  if (fence)
    {
      if (memchr (fence, 0, 0))
        return 1;
      strcpy (fence - 9, "12345678");
      if (memchr (fence - 9, 0, 79) != fence - 1)
        return 2;
    }
  return 0;
]])], [gl_cv_func_memchr_works=yes], [gl_cv_func_memchr_works=no],
      [dnl Be pessimistic for now.
       gl_cv_func_memchr_works="guessing no"])])
    if test "$gl_cv_func_memchr_works" != yes; then
      REPLACE_MEMCHR=1
    fi
  else
    HAVE_MEMCHR=0
  fi
  if test $HAVE_MEMCHR = 0 || test $REPLACE_MEMCHR = 1; then
    AC_LIBOBJ([memchr])
    gl_PREREQ_MEMCHR
  fi
])

# Prerequisites of lib/memchr.c.
AC_DEFUN([gl_PREREQ_MEMCHR], [
  AC_CHECK_HEADERS([bp-sym.h])
])


code:
# mmap-anon.m4 serial 8
dnl Copyright (C) 2005, 2007, 2009-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# Detect how mmap can be used to create anonymous (not file-backed) memory
# mappings.
# - On Linux, AIX, OSF/1, Solaris, Cygwin, Interix, Haiku, both MAP_ANONYMOUS
#   and MAP_ANON exist and have the same value.
# - On HP-UX, only MAP_ANONYMOUS exists.
# - On MacOS X, FreeBSD, NetBSD, OpenBSD, only MAP_ANON exists.
# - On IRIX, neither exists, and a file descriptor opened to /dev/zero must be
#   used.

AC_DEFUN([gl_FUNC_MMAP_ANON],
[
  dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
  AC_REQUIRE([AC_PROG_CPP])
  AC_REQUIRE([AC_PROG_EGREP])

  dnl Persuade glibc <sys/mman.h> to define MAP_ANONYMOUS.
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

  # Check for mmap(). Don't use AC_FUNC_MMAP, because it checks too much: it
  # fails on HP-UX 11, because MAP_FIXED mappings do not work. But this is
  # irrelevant for anonymous mappings.
  AC_CHECK_FUNC([mmap], [gl_have_mmap=yes], [gl_have_mmap=no])

  # Try to allow MAP_ANONYMOUS.
  gl_have_mmap_anonymous=no
  if test $gl_have_mmap = yes; then
    AC_MSG_CHECKING([for MAP_ANONYMOUS])
    AC_EGREP_CPP([I cant identify this map.], [
#include <sys/mman.h>
#ifdef MAP_ANONYMOUS
    I cant identify this map.
#endif
],
      [gl_have_mmap_anonymous=yes])
    if test $gl_have_mmap_anonymous != yes; then
      AC_EGREP_CPP([I cant identify this map.], [
#include <sys/mman.h>
#ifdef MAP_ANON
    I cant identify this map.
#endif
],
        [AC_DEFINE([MAP_ANONYMOUS], [MAP_ANON],
          [Define to a substitute value for mmap()'s MAP_ANONYMOUS flag.])
         gl_have_mmap_anonymous=yes])
    fi
    AC_MSG_RESULT([$gl_have_mmap_anonymous])
    if test $gl_have_mmap_anonymous = yes; then
      AC_DEFINE([HAVE_MAP_ANONYMOUS], [1],
        [Define to 1 if mmap()'s MAP_ANONYMOUS flag is available after including
         config.h and <sys/mman.h>.])
    fi
  fi
])

license: mit


code:
# multiarch.m4 serial 5
dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# Determine whether the compiler is or may be producing universal binaries.
#
# On MacOS X 10.5 and later systems, the user can create libraries and
# executables that work on multiple system types--known as "fat" or
# "universal" binaries--by specifying multiple '-arch' options to the
# compiler but only a single '-arch' option to the preprocessor.  Like
# this:
#
#     ./configure CC="gcc -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
#                 CXX="g++ -arch i386 -arch x86_64 -arch ppc -arch ppc64" \
#                 CPP="gcc -E" CXXCPP="g++ -E"
#
# Detect this situation and set the macro AA_APPLE_UNIVERSAL_BUILD at the
# beginning of config.h and set APPLE_UNIVERSAL_BUILD accordingly.

AC_DEFUN_ONCE([gl_MULTIARCH],
[
  dnl Code similar to autoconf-2.63 AC_C_BIGENDIAN.
  gl_cv_c_multiarch=no
  AC_COMPILE_IFELSE(
    [AC_LANG_SOURCE(
      [[#ifndef __APPLE_CC__
         not a universal capable compiler
        #endif
        typedef int dummy;
      ]])],
    [
     dnl Check for potential -arch flags.  It is not universal unless
     dnl there are at least two -arch flags with different values.
     arch=
     prev=
     for word in ${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}; do
       if test -n "$prev"; then
         case $word in
           i?86 | x86_64 | ppc | ppc64)
             if test -z "$arch" || test "$arch" = "$word"; then
               arch="$word"
             else
               gl_cv_c_multiarch=yes
             fi
             ;;
         esac
         prev=
       else
         if test "x$word" = "x-arch"; then
           prev=arch
         fi
       fi
     done
    ])
  if test $gl_cv_c_multiarch = yes; then
    AC_DEFINE([AA_APPLE_UNIVERSAL_BUILD], [1],
      [Define if the compiler is building for multiple architectures of Apple platforms at once.])
    APPLE_UNIVERSAL_BUILD=1
  else
    APPLE_UNIVERSAL_BUILD=0
  fi
  AC_SUBST([APPLE_UNIVERSAL_BUILD])
])


code:
# netdb_h.m4 serial 9
dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_HEADER_NETDB],
[
  AC_REQUIRE([gl_NETDB_H_DEFAULTS])
  AC_CHECK_HEADERS_ONCE([netdb.h])
  gl_CHECK_NEXT_HEADERS([netdb.h])
  if test $ac_cv_header_netdb_h = yes; then
    HAVE_NETDB_H=1
  else
    HAVE_NETDB_H=0
  fi
  AC_SUBST([HAVE_NETDB_H])

  dnl Check for declarations of anything we want to poison if the
  dnl corresponding gnulib module is not in use.
  gl_WARN_ON_USE_PREPARE([[#include <netdb.h>]],
    [getaddrinfo freeaddrinfo gai_strerror getnameinfo])
])

AC_DEFUN([gl_NETDB_MODULE_INDICATOR],
[
  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  AC_REQUIRE([gl_NETDB_H_DEFAULTS])
  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
])

AC_DEFUN([gl_NETDB_H_DEFAULTS],
[
  GNULIB_GETADDRINFO=0; AC_SUBST([GNULIB_GETADDRINFO])
  dnl Assume proper GNU behavior unless another module says otherwise.
  HAVE_STRUCT_ADDRINFO=1;   AC_SUBST([HAVE_STRUCT_ADDRINFO])
  HAVE_DECL_FREEADDRINFO=1; AC_SUBST([HAVE_DECL_FREEADDRINFO])
  HAVE_DECL_GAI_STRERROR=1; AC_SUBST([HAVE_DECL_GAI_STRERROR])
  HAVE_DECL_GETADDRINFO=1;  AC_SUBST([HAVE_DECL_GETADDRINFO])
  HAVE_DECL_GETNAMEINFO=1;  AC_SUBST([HAVE_DECL_GETNAMEINFO])
])


code:
# netinet_in_h.m4 serial 4
dnl Copyright (C) 2006-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_HEADER_NETINET_IN],
[
  AC_CACHE_CHECK([whether <netinet/in.h> is self-contained],
    [gl_cv_header_netinet_in_h_selfcontained],
    [
      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <netinet/in.h>]], [[]])],
        [gl_cv_header_netinet_in_h_selfcontained=yes],
        [gl_cv_header_netinet_in_h_selfcontained=no])
    ])
  if test $gl_cv_header_netinet_in_h_selfcontained = yes; then
    NETINET_IN_H=''
  else
    NETINET_IN_H='netinet/in.h'
    AC_CHECK_HEADERS([netinet/in.h])
    gl_CHECK_NEXT_HEADERS([netinet/in.h])
    if test $ac_cv_header_netinet_in_h = yes; then
      HAVE_NETINET_IN_H=1
    else
      HAVE_NETINET_IN_H=0
    fi
    AC_SUBST([HAVE_NETINET_IN_H])
  fi
  AC_SUBST([NETINET_IN_H])
])


code:
# pathmax.m4 serial 8
dnl Copyright (C) 2002-2003, 2005-2006, 2009-2010 Free Software Foundation,
dnl Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_PATHMAX],
[
  dnl Prerequisites of lib/pathmax.h.
  AC_CHECK_FUNCS_ONCE([pathconf])
  AC_CHECK_HEADERS_ONCE([sys/param.h])
])


code:
# printf.m4 serial 33
dnl Copyright (C) 2003, 2007-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl Test whether the *printf family of functions supports the 'j', 'z', 't',
dnl 'L' size specifiers. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_sizes_c99.

AC_DEFUN([gl_PRINTF_SIZES_C99],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([gl_AC_HEADER_STDINT_H])
  AC_REQUIRE([gl_AC_HEADER_INTTYPES_H])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports size specifiers as in C99],
    [gl_cv_func_printf_sizes_c99],
    [
      AC_TRY_RUN([
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#if HAVE_STDINT_H_WITH_UINTMAX
# include <stdint.h>
#endif
#if HAVE_INTTYPES_H_WITH_UINTMAX
# include <inttypes.h>
#endif
static char buf[100];
int main ()
{
#if HAVE_STDINT_H_WITH_UINTMAX || HAVE_INTTYPES_H_WITH_UINTMAX
  buf[0] = '\0';
  if (sprintf (buf, "%ju %d", (uintmax_t) 12345671, 33, 44, 55) < 0
      || strcmp (buf, "12345671 33") != 0)
    return 1;
#endif
  buf[0] = '\0';
  if (sprintf (buf, "%zu %d", (size_t) 12345672, 33, 44, 55) < 0
      || strcmp (buf, "12345672 33") != 0)
    return 1;
  buf[0] = '\0';
  if (sprintf (buf, "%tu %d", (ptrdiff_t) 12345673, 33, 44, 55) < 0
      || strcmp (buf, "12345673 33") != 0)
    return 1;
  buf[0] = '\0';
  if (sprintf (buf, "%Lg %d", (long double) 1.5, 33, 44, 55) < 0
      || strcmp (buf, "1.5 33") != 0)
    return 1;
  return 0;
}], [gl_cv_func_printf_sizes_c99=yes], [gl_cv_func_printf_sizes_c99=no],
      [
changequote(,)dnl
       case "$host_os" in
                               # Guess yes on glibc systems.
         *-gnu*)               gl_cv_func_printf_sizes_c99="guessing yes";;
                               # Guess yes on FreeBSD >= 5.
         freebsd[1-4]*)        gl_cv_func_printf_sizes_c99="guessing no";;
         freebsd* | kfreebsd*) gl_cv_func_printf_sizes_c99="guessing yes";;
                               # Guess yes on MacOS X >= 10.3.
         darwin[1-6].*)        gl_cv_func_printf_sizes_c99="guessing no";;
         darwin*)              gl_cv_func_printf_sizes_c99="guessing yes";;
                               # Guess yes on OpenBSD >= 3.9.
         openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
                               gl_cv_func_printf_sizes_c99="guessing no";;
         openbsd*)             gl_cv_func_printf_sizes_c99="guessing yes";;
                               # Guess yes on Solaris >= 2.10.
         solaris2.[0-9]*)      gl_cv_func_printf_sizes_c99="guessing no";;
         solaris*)             gl_cv_func_printf_sizes_c99="guessing yes";;
                               # Guess yes on NetBSD >= 3.
         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
                               gl_cv_func_printf_sizes_c99="guessing no";;
         netbsd*)              gl_cv_func_printf_sizes_c99="guessing yes";;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_printf_sizes_c99="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports 'long double'
dnl arguments together with the 'L' size specifier. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_long_double.

AC_DEFUN([gl_PRINTF_LONG_DOUBLE],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports 'long double' arguments],
    [gl_cv_func_printf_long_double],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[10000];
int main ()
{
  buf[0] = '\0';
  if (sprintf (buf, "%Lf %d", 1.75L, 33, 44, 55) < 0
      || strcmp (buf, "1.750000 33") != 0)
    return 1;
  buf[0] = '\0';
  if (sprintf (buf, "%Le %d", 1.75L, 33, 44, 55) < 0
      || strcmp (buf, "1.750000e+00 33") != 0)
    return 1;
  buf[0] = '\0';
  if (sprintf (buf, "%Lg %d", 1.75L, 33, 44, 55) < 0
      || strcmp (buf, "1.75 33") != 0)
    return 1;
  return 0;
}], [gl_cv_func_printf_long_double=yes], [gl_cv_func_printf_long_double=no],
      [
changequote(,)dnl
       case "$host_os" in
         beos*)        gl_cv_func_printf_long_double="guessing no";;
         mingw* | pw*) gl_cv_func_printf_long_double="guessing no";;
         *)            gl_cv_func_printf_long_double="guessing yes";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports infinite and NaN
dnl 'double' arguments and negative zero arguments in the %f, %e, %g
dnl directives. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_infinite.

AC_DEFUN([gl_PRINTF_INFINITE],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports infinite 'double' arguments],
    [gl_cv_func_printf_infinite],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static int
strisnan (const char *string, size_t start_index, size_t end_index)
{
  if (start_index < end_index)
    {
      if (string[start_index] == '-')
        start_index++;
      if (start_index + 3 <= end_index
          && memcmp (string + start_index, "nan", 3) == 0)
        {
          start_index += 3;
          if (start_index == end_index
              || (string[start_index] == '(' && string[end_index - 1] == ')'))
            return 1;
        }
    }
  return 0;
}
static int
have_minus_zero ()
{
  static double plus_zero = 0.0;
  double minus_zero = - plus_zero;
  return memcmp (&plus_zero, &minus_zero, sizeof (double)) != 0;
}
static char buf[10000];
static double zero = 0.0;
int main ()
{
  if (sprintf (buf, "%f", 1.0 / 0.0) < 0
      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
    return 1;
  if (sprintf (buf, "%f", -1.0 / 0.0) < 0
      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
    return 1;
  if (sprintf (buf, "%f", zero / zero) < 0
      || !strisnan (buf, 0, strlen (buf)))
    return 1;
  if (sprintf (buf, "%e", 1.0 / 0.0) < 0
      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
    return 1;
  if (sprintf (buf, "%e", -1.0 / 0.0) < 0
      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
    return 1;
  if (sprintf (buf, "%e", zero / zero) < 0
      || !strisnan (buf, 0, strlen (buf)))
    return 1;
  if (sprintf (buf, "%g", 1.0 / 0.0) < 0
      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
    return 1;
  if (sprintf (buf, "%g", -1.0 / 0.0) < 0
      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
    return 1;
  if (sprintf (buf, "%g", zero / zero) < 0
      || !strisnan (buf, 0, strlen (buf)))
    return 1;
  /* This test fails on HP-UX 10.20.  */
  if (have_minus_zero ())
    if (sprintf (buf, "%g", - zero) < 0
        || strcmp (buf, "-0") != 0)
    return 1;
  return 0;
}], [gl_cv_func_printf_infinite=yes], [gl_cv_func_printf_infinite=no],
      [
changequote(,)dnl
       case "$host_os" in
                               # Guess yes on glibc systems.
         *-gnu*)               gl_cv_func_printf_infinite="guessing yes";;
                               # Guess yes on FreeBSD >= 6.
         freebsd[1-5]*)        gl_cv_func_printf_infinite="guessing no";;
         freebsd* | kfreebsd*) gl_cv_func_printf_infinite="guessing yes";;
                               # Guess yes on MacOS X >= 10.3.
         darwin[1-6].*)        gl_cv_func_printf_infinite="guessing no";;
         darwin*)              gl_cv_func_printf_infinite="guessing yes";;
                               # Guess yes on HP-UX >= 11.
         hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite="guessing no";;
         hpux*)                gl_cv_func_printf_infinite="guessing yes";;
                               # Guess yes on NetBSD >= 3.
         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
                               gl_cv_func_printf_infinite="guessing no";;
         netbsd*)              gl_cv_func_printf_infinite="guessing yes";;
                               # Guess yes on BeOS.
         beos*)                gl_cv_func_printf_infinite="guessing yes";;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_printf_infinite="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports infinite and NaN
dnl 'long double' arguments in the %f, %e, %g directives. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_infinite_long_double.

AC_DEFUN([gl_PRINTF_INFINITE_LONG_DOUBLE],
[
  AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([gl_BIGENDIAN])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  dnl The user can set or unset the variable gl_printf_safe to indicate
  dnl that he wishes a safe handling of non-IEEE-754 'long double' values.
  if test -n "$gl_printf_safe"; then
    AC_DEFINE([CHECK_PRINTF_SAFE], [1],
      [Define if you wish *printf() functions that have a safe handling of
       non-IEEE-754 'long double' values.])
  fi
  case "$gl_cv_func_printf_long_double" in
    *yes)
      AC_CACHE_CHECK([whether printf supports infinite 'long double' arguments],
        [gl_cv_func_printf_infinite_long_double],
        [
          AC_TRY_RUN([
]GL_NOCRASH[
#include <float.h>
#include <stdio.h>
#include <string.h>
static int
strisnan (const char *string, size_t start_index, size_t end_index)
{
  if (start_index < end_index)
    {
      if (string[start_index] == '-')
        start_index++;
      if (start_index + 3 <= end_index
          && memcmp (string + start_index, "nan", 3) == 0)
        {
          start_index += 3;
          if (start_index == end_index
              || (string[start_index] == '(' && string[end_index - 1] == ')'))
            return 1;
        }
    }
  return 0;
}
static char buf[10000];
static long double zeroL = 0.0L;
int main ()
{
  nocrash_init();
  if (sprintf (buf, "%Lf", 1.0L / 0.0L) < 0
      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
    return 1;
  if (sprintf (buf, "%Lf", -1.0L / 0.0L) < 0
      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
    return 1;
  if (sprintf (buf, "%Lf", zeroL / zeroL) < 0
      || !strisnan (buf, 0, strlen (buf)))
    return 1;
  if (sprintf (buf, "%Le", 1.0L / 0.0L) < 0
      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
    return 1;
  if (sprintf (buf, "%Le", -1.0L / 0.0L) < 0
      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
    return 1;
  if (sprintf (buf, "%Le", zeroL / zeroL) < 0
      || !strisnan (buf, 0, strlen (buf)))
    return 1;
  if (sprintf (buf, "%Lg", 1.0L / 0.0L) < 0
      || (strcmp (buf, "inf") != 0 && strcmp (buf, "infinity") != 0))
    return 1;
  if (sprintf (buf, "%Lg", -1.0L / 0.0L) < 0
      || (strcmp (buf, "-inf") != 0 && strcmp (buf, "-infinity") != 0))
    return 1;
  if (sprintf (buf, "%Lg", zeroL / zeroL) < 0
      || !strisnan (buf, 0, strlen (buf)))
    return 1;
#if CHECK_PRINTF_SAFE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_))
/* Representation of an 80-bit 'long double' as an initializer for a sequence
   of 'unsigned int' words.  */
# ifdef WORDS_BIGENDIAN
#  define LDBL80_WORDS(exponent,manthi,mantlo) \
     { ((unsigned int) (exponent) << 16) | ((unsigned int) (manthi) >> 16), \
       ((unsigned int) (manthi) << 16) | (unsigned int) (mantlo) >> 16),    \
       (unsigned int) (mantlo) << 16                                        \
     }
# else
#  define LDBL80_WORDS(exponent,manthi,mantlo) \
     { mantlo, manthi, exponent }
# endif
  { /* Quiet NaN.  */
    static union { unsigned int word[4]; long double value; } x =
      { LDBL80_WORDS (0xFFFF, 0xC3333333, 0x00000000) };
    if (sprintf (buf, "%Lf", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Le", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Lg", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
  }
  {
    /* Signalling NaN.  */
    static union { unsigned int word[4]; long double value; } x =
      { LDBL80_WORDS (0xFFFF, 0x83333333, 0x00000000) };
    if (sprintf (buf, "%Lf", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Le", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Lg", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
  }
  { /* Pseudo-NaN.  */
    static union { unsigned int word[4]; long double value; } x =
      { LDBL80_WORDS (0xFFFF, 0x40000001, 0x00000000) };
    if (sprintf (buf, "%Lf", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Le", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Lg", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
  }
  { /* Pseudo-Infinity.  */
    static union { unsigned int word[4]; long double value; } x =
      { LDBL80_WORDS (0xFFFF, 0x00000000, 0x00000000) };
    if (sprintf (buf, "%Lf", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Le", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Lg", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
  }
  { /* Pseudo-Zero.  */
    static union { unsigned int word[4]; long double value; } x =
      { LDBL80_WORDS (0x4004, 0x00000000, 0x00000000) };
    if (sprintf (buf, "%Lf", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Le", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Lg", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
  }
  { /* Unnormalized number.  */
    static union { unsigned int word[4]; long double value; } x =
      { LDBL80_WORDS (0x4000, 0x63333333, 0x00000000) };
    if (sprintf (buf, "%Lf", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Le", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Lg", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
  }
  { /* Pseudo-Denormal.  */
    static union { unsigned int word[4]; long double value; } x =
      { LDBL80_WORDS (0x0000, 0x83333333, 0x00000000) };
    if (sprintf (buf, "%Lf", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Le", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
    if (sprintf (buf, "%Lg", x.value) < 0
        || !strisnan (buf, 0, strlen (buf)))
      return 1;
  }
#endif
  return 0;
}],
          [gl_cv_func_printf_infinite_long_double=yes],
          [gl_cv_func_printf_infinite_long_double=no],
          [
changequote(,)dnl
           case "$host_cpu" in
                                   # Guess no on ia64, x86_64, i386.
             ia64 | x86_64 | i*86) gl_cv_func_printf_infinite_long_double="guessing no";;
             *)
               case "$host_os" in
                                       # Guess yes on glibc systems.
                 *-gnu*)               gl_cv_func_printf_infinite_long_double="guessing yes";;
                                       # Guess yes on FreeBSD >= 6.
                 freebsd[1-5]*)        gl_cv_func_printf_infinite_long_double="guessing no";;
                 freebsd* | kfreebsd*) gl_cv_func_printf_infinite_long_double="guessing yes";;
                                       # Guess yes on MacOS X >= 10.3.
                 darwin[1-6].*)        gl_cv_func_printf_infinite_long_double="guessing no";;
                 darwin*)              gl_cv_func_printf_infinite_long_double="guessing yes";;
                                       # Guess yes on HP-UX >= 11.
                 hpux[7-9]* | hpux10*) gl_cv_func_printf_infinite_long_double="guessing no";;
                 hpux*)                gl_cv_func_printf_infinite_long_double="guessing yes";;
                                       # Guess yes on NetBSD >= 3.
                 netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
                                       gl_cv_func_printf_infinite_long_double="guessing no";;
                 netbsd*)              gl_cv_func_printf_infinite_long_double="guessing yes";;
                                       # If we don't know, assume the worst.
                 *)                    gl_cv_func_printf_infinite_long_double="guessing no";;
               esac
               ;;
           esac
changequote([,])dnl
          ])
        ])
      ;;
    *)
      gl_cv_func_printf_infinite_long_double="irrelevant"
      ;;
  esac
])

dnl Test whether the *printf family of functions supports the 'a' and 'A'
dnl conversion specifier for hexadecimal output of floating-point numbers.
dnl (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_directive_a.

AC_DEFUN([gl_PRINTF_DIRECTIVE_A],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports the 'a' and 'A' directives],
    [gl_cv_func_printf_directive_a],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[100];
int main ()
{
  if (sprintf (buf, "%a %d", 3.1416015625, 33, 44, 55) < 0
      || (strcmp (buf, "0x1.922p+1 33") != 0
          && strcmp (buf, "0x3.244p+0 33") != 0
          && strcmp (buf, "0x6.488p-1 33") != 0
          && strcmp (buf, "0xc.91p-2 33") != 0))
    return 1;
  if (sprintf (buf, "%A %d", -3.1416015625, 33, 44, 55) < 0
      || (strcmp (buf, "-0X1.922P+1 33") != 0
          && strcmp (buf, "-0X3.244P+0 33") != 0
          && strcmp (buf, "-0X6.488P-1 33") != 0
          && strcmp (buf, "-0XC.91P-2 33") != 0))
    return 1;
  /* This catches a FreeBSD 6.1 bug: it doesn't round.  */
  if (sprintf (buf, "%.2a %d", 1.51, 33, 44, 55) < 0
      || (strcmp (buf, "0x1.83p+0 33") != 0
          && strcmp (buf, "0x3.05p-1 33") != 0
          && strcmp (buf, "0x6.0ap-2 33") != 0
          && strcmp (buf, "0xc.14p-3 33") != 0))
    return 1;
  /* This catches a FreeBSD 6.1 bug.  See
     <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html> */
  if (sprintf (buf, "%010a %d", 1.0 / 0.0, 33, 44, 55) < 0
      || buf[0] == '0')
    return 1;
  /* This catches a MacOS X 10.3.9 (Darwin 7.9) bug.  */
  if (sprintf (buf, "%.1a", 1.999) < 0
      || (strcmp (buf, "0x1.0p+1") != 0
          && strcmp (buf, "0x2.0p+0") != 0
          && strcmp (buf, "0x4.0p-1") != 0
          && strcmp (buf, "0x8.0p-2") != 0))
    return 1;
  /* This catches the same MacOS X 10.3.9 (Darwin 7.9) bug and also a
     glibc 2.4 bug <http://sourceware.org/bugzilla/show_bug.cgi?id=2908>.  */
  if (sprintf (buf, "%.1La", 1.999L) < 0
      || (strcmp (buf, "0x1.0p+1") != 0
          && strcmp (buf, "0x2.0p+0") != 0
          && strcmp (buf, "0x4.0p-1") != 0
          && strcmp (buf, "0x8.0p-2") != 0))
    return 1;
  return 0;
}], [gl_cv_func_printf_directive_a=yes], [gl_cv_func_printf_directive_a=no],
      [
       case "$host_os" in
                               # Guess yes on glibc >= 2.5 systems.
         *-gnu*)
           AC_EGREP_CPP([BZ2908], [
             #include <features.h>
             #ifdef __GNU_LIBRARY__
              #if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 5) || (__GLIBC__ > 2)
               BZ2908
              #endif
             #endif
             ],
             [gl_cv_func_printf_directive_a="guessing yes"],
             [gl_cv_func_printf_directive_a="guessing no"])
           ;;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_printf_directive_a="guessing no";;
       esac
      ])
    ])
])

dnl Test whether the *printf family of functions supports the %F format
dnl directive. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_directive_f.

AC_DEFUN([gl_PRINTF_DIRECTIVE_F],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports the 'F' directive],
    [gl_cv_func_printf_directive_f],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[100];
int main ()
{
  if (sprintf (buf, "%F %d", 1234567.0, 33, 44, 55) < 0
      || strcmp (buf, "1234567.000000 33") != 0)
    return 1;
  if (sprintf (buf, "%F", 1.0 / 0.0) < 0
      || (strcmp (buf, "INF") != 0 && strcmp (buf, "INFINITY") != 0))
    return 1;
  /* This catches a Cygwin 1.5.x bug.  */
  if (sprintf (buf, "%.F", 1234.0) < 0
      || strcmp (buf, "1234") != 0)
    return 1;
  return 0;
}], [gl_cv_func_printf_directive_f=yes], [gl_cv_func_printf_directive_f=no],
      [
changequote(,)dnl
       case "$host_os" in
                               # Guess yes on glibc systems.
         *-gnu*)               gl_cv_func_printf_directive_f="guessing yes";;
                               # Guess yes on FreeBSD >= 6.
         freebsd[1-5]*)        gl_cv_func_printf_directive_f="guessing no";;
         freebsd* | kfreebsd*) gl_cv_func_printf_directive_f="guessing yes";;
                               # Guess yes on MacOS X >= 10.3.
         darwin[1-6].*)        gl_cv_func_printf_directive_f="guessing no";;
         darwin*)              gl_cv_func_printf_directive_f="guessing yes";;
                               # Guess yes on Solaris >= 2.10.
         solaris2.[0-9]*)      gl_cv_func_printf_directive_f="guessing no";;
         solaris*)             gl_cv_func_printf_directive_f="guessing yes";;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_printf_directive_f="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports the %n format
dnl directive. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_printf_directive_n.

AC_DEFUN([gl_PRINTF_DIRECTIVE_N],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports the 'n' directive],
    [gl_cv_func_printf_directive_n],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char fmtstring[10];
static char buf[100];
int main ()
{
  int count = -1;
  /* Copy the format string.  Some systems (glibc with _FORTIFY_SOURCE=2)
     support %n in format strings in read-only memory but not in writable
     memory.  */
  strcpy (fmtstring, "%d %n");
  if (sprintf (buf, fmtstring, 123, &count, 33, 44, 55) < 0
      || strcmp (buf, "123 ") != 0
      || count != 4)
    return 1;
  return 0;
}], [gl_cv_func_printf_directive_n=yes], [gl_cv_func_printf_directive_n=no],
      [
changequote(,)dnl
       case "$host_os" in
         *)     gl_cv_func_printf_directive_n="guessing yes";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports the %ls format
dnl directive and in particular, when a precision is specified, whether
dnl the functions stop converting the wide string argument when the number
dnl of bytes that have been produced by this conversion equals or exceeds
dnl the precision.
dnl Result is gl_cv_func_printf_directive_ls.

AC_DEFUN([gl_PRINTF_DIRECTIVE_LS],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports the 'ls' directive],
    [gl_cv_func_printf_directive_ls],
    [
      AC_TRY_RUN([
/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
   <wchar.h>.
   BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be
   included before <wchar.h>.  */
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include <wchar.h>
#include <string.h>
int main ()
{
  char buf[100];
  /* Test whether %ls works at all.
     This test fails on OpenBSD 4.0, IRIX 6.5, Solaris 2.6, Haiku, but not on
     Cygwin 1.5.  */
  {
    static const wchar_t wstring[] = { 'a', 'b', 'c', 0 };
    buf[0] = '\0';
    if (sprintf (buf, "%ls", wstring) < 0
        || strcmp (buf, "abc") != 0)
      return 1;
  }
  /* This test fails on IRIX 6.5, Solaris 2.6, Cygwin 1.5, Haiku (with an
     assertion failure inside libc), but not on OpenBSD 4.0.  */
  {
    static const wchar_t wstring[] = { 'a', 0 };
    buf[0] = '\0';
    if (sprintf (buf, "%ls", wstring) < 0
        || strcmp (buf, "a") != 0)
      return 1;
  }
  /* Test whether precisions in %ls are supported as specified in ISO C 99
     section 7.19.6.1:
       "If a precision is specified, no more than that many bytes are written
        (including shift sequences, if any), and the array shall contain a
        null wide character if, to equal the multibyte character sequence
        length given by the precision, the function would need to access a
        wide character one past the end of the array."
     This test fails on Solaris 10.  */
  {
    static const wchar_t wstring[] = { 'a', 'b', (wchar_t) 0xfdfdfdfd, 0 };
    buf[0] = '\0';
    if (sprintf (buf, "%.2ls", wstring) < 0
        || strcmp (buf, "ab") != 0)
      return 1;
  }
  return 0;
}], [gl_cv_func_printf_directive_ls=yes], [gl_cv_func_printf_directive_ls=no],
      [
changequote(,)dnl
       case "$host_os" in
         openbsd*)        gl_cv_func_printf_directive_ls="guessing no";;
         irix*)           gl_cv_func_printf_directive_ls="guessing no";;
         solaris*)        gl_cv_func_printf_directive_ls="guessing no";;
         cygwin*)         gl_cv_func_printf_directive_ls="guessing no";;
         beos* | haiku*)  gl_cv_func_printf_directive_ls="guessing no";;
         *)               gl_cv_func_printf_directive_ls="guessing yes";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports POSIX/XSI format
dnl strings with positions. (POSIX:2001)
dnl Result is gl_cv_func_printf_positions.

AC_DEFUN([gl_PRINTF_POSITIONS],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports POSIX/XSI format strings with positions],
    [gl_cv_func_printf_positions],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
/* The string "%2$d %1$d", with dollar characters protected from the shell's
   dollar expansion (possibly an autoconf bug).  */
static char format[] = { '%', '2', '$', 'd', ' ', '%', '1', '$', 'd', '\0' };
static char buf[100];
int main ()
{
  sprintf (buf, format, 33, 55);
  return (strcmp (buf, "55 33") != 0);
}], [gl_cv_func_printf_positions=yes], [gl_cv_func_printf_positions=no],
      [
changequote(,)dnl
       case "$host_os" in
         netbsd[1-3]* | netbsdelf[1-3]* | netbsdaout[1-3]* | netbsdcoff[1-3]*)
                       gl_cv_func_printf_positions="guessing no";;
         beos*)        gl_cv_func_printf_positions="guessing no";;
         mingw* | pw*) gl_cv_func_printf_positions="guessing no";;
         *)            gl_cv_func_printf_positions="guessing yes";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports POSIX/XSI format
dnl strings with the ' flag for grouping of decimal digits. (POSIX:2001)
dnl Result is gl_cv_func_printf_flag_grouping.

AC_DEFUN([gl_PRINTF_FLAG_GROUPING],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports the grouping flag],
    [gl_cv_func_printf_flag_grouping],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[100];
int main ()
{
  if (sprintf (buf, "%'d %d", 1234567, 99) < 0
      || buf[strlen (buf) - 1] != '9')
    return 1;
  return 0;
}], [gl_cv_func_printf_flag_grouping=yes], [gl_cv_func_printf_flag_grouping=no],
      [
changequote(,)dnl
       case "$host_os" in
         cygwin*)      gl_cv_func_printf_flag_grouping="guessing no";;
         netbsd*)      gl_cv_func_printf_flag_grouping="guessing no";;
         mingw* | pw*) gl_cv_func_printf_flag_grouping="guessing no";;
         *)            gl_cv_func_printf_flag_grouping="guessing yes";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports the - flag correctly.
dnl (ISO C99.) See
dnl <http://lists.gnu.org/archive/html/bug-coreutils/2008-02/msg00035.html>
dnl Result is gl_cv_func_printf_flag_leftadjust.

AC_DEFUN([gl_PRINTF_FLAG_LEFTADJUST],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports the left-adjust flag correctly],
    [gl_cv_func_printf_flag_leftadjust],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[100];
int main ()
{
  /* Check that a '-' flag is not annihilated by a negative width.  */
  if (sprintf (buf, "a%-*sc", -3, "b") < 0
      || strcmp (buf, "ab  c") != 0)
    return 1;
  return 0;
}],
        [gl_cv_func_printf_flag_leftadjust=yes],
        [gl_cv_func_printf_flag_leftadjust=no],
        [
changequote(,)dnl
         case "$host_os" in
                    # Guess yes on HP-UX 11.
           hpux11*) gl_cv_func_printf_flag_leftadjust="guessing yes";;
                    # Guess no on HP-UX 10 and older.
           hpux*)   gl_cv_func_printf_flag_leftadjust="guessing no";;
                    # Guess yes otherwise.
           *)       gl_cv_func_printf_flag_leftadjust="guessing yes";;
         esac
changequote([,])dnl
        ])
    ])
])

dnl Test whether the *printf family of functions supports padding of non-finite
dnl values with the 0 flag correctly. (ISO C99 + TC1 + TC2.) See
dnl <http://lists.gnu.org/archive/html/bug-gnulib/2007-04/msg00107.html>
dnl Result is gl_cv_func_printf_flag_zero.

AC_DEFUN([gl_PRINTF_FLAG_ZERO],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports the zero flag correctly],
    [gl_cv_func_printf_flag_zero],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[100];
int main ()
{
  if (sprintf (buf, "%010f", 1.0 / 0.0, 33, 44, 55) < 0
      || (strcmp (buf, "       inf") != 0
          && strcmp (buf, "  infinity") != 0))
    return 1;
  return 0;
}], [gl_cv_func_printf_flag_zero=yes], [gl_cv_func_printf_flag_zero=no],
      [
changequote(,)dnl
       case "$host_os" in
                 # Guess yes on glibc systems.
         *-gnu*) gl_cv_func_printf_flag_zero="guessing yes";;
                 # Guess yes on BeOS.
         beos*)  gl_cv_func_printf_flag_zero="guessing yes";;
                 # If we don't know, assume the worst.
         *)      gl_cv_func_printf_flag_zero="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions supports large precisions.
dnl On mingw, precisions larger than 512 are treated like 512, in integer,
dnl floating-point or pointer output. On BeOS, precisions larger than 1044
dnl crash the program.
dnl Result is gl_cv_func_printf_precision.

AC_DEFUN([gl_PRINTF_PRECISION],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf supports large precisions],
    [gl_cv_func_printf_precision],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[5000];
int main ()
{
#ifdef __BEOS__
  /* On BeOS, this would crash and show a dialog box.  Avoid the crash.  */
  return 1;
#endif
  if (sprintf (buf, "%.4000d %d", 1, 33, 44) < 4000 + 3)
    return 1;
  return 0;
}], [gl_cv_func_printf_precision=yes], [gl_cv_func_printf_precision=no],
      [
changequote(,)dnl
       case "$host_os" in
         # Guess no only on native Win32 and BeOS systems.
         mingw* | pw*) gl_cv_func_printf_precision="guessing no" ;;
         beos*)        gl_cv_func_printf_precision="guessing no" ;;
         *)            gl_cv_func_printf_precision="guessing yes" ;;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the *printf family of functions recovers gracefully in case
dnl of an out-of-memory condition, or whether it crashes the entire program.
dnl Result is gl_cv_func_printf_enomem.

AC_DEFUN([gl_PRINTF_ENOMEM],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([gl_MULTIARCH])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether printf survives out-of-memory conditions],
    [gl_cv_func_printf_enomem],
    [
      gl_cv_func_printf_enomem="guessing no"
      if test "$cross_compiling" = no; then
        if test $APPLE_UNIVERSAL_BUILD = 0; then
          AC_LANG_CONFTEST([AC_LANG_SOURCE([
]GL_NOCRASH[
changequote(,)dnl
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <errno.h>
int main()
{
  struct rlimit limit;
  int ret;
  nocrash_init ();
  /* Some printf implementations allocate temporary space with malloc.  */
  /* On BSD systems, malloc() is limited by RLIMIT_DATA.  */
#ifdef RLIMIT_DATA
  if (getrlimit (RLIMIT_DATA, &limit) < 0)
    return 77;
  if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
    limit.rlim_max = 5000000;
  limit.rlim_cur = limit.rlim_max;
  if (setrlimit (RLIMIT_DATA, &limit) < 0)
    return 77;
#endif
  /* On Linux systems, malloc() is limited by RLIMIT_AS.  */
#ifdef RLIMIT_AS
  if (getrlimit (RLIMIT_AS, &limit) < 0)
    return 77;
  if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
    limit.rlim_max = 5000000;
  limit.rlim_cur = limit.rlim_max;
  if (setrlimit (RLIMIT_AS, &limit) < 0)
    return 77;
#endif
  /* Some printf implementations allocate temporary space on the stack.  */
#ifdef RLIMIT_STACK
  if (getrlimit (RLIMIT_STACK, &limit) < 0)
    return 77;
  if (limit.rlim_max == RLIM_INFINITY || limit.rlim_max > 5000000)
    limit.rlim_max = 5000000;
  limit.rlim_cur = limit.rlim_max;
  if (setrlimit (RLIMIT_STACK, &limit) < 0)
    return 77;
#endif
  ret = printf ("%.5000000f", 1.0);
  return !(ret == 5000002 || (ret < 0 && errno == ENOMEM));
}
changequote([,])dnl
          ])])
          if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
            (./conftest
             result=$?
             if test $result != 0 && test $result != 77; then result=1; fi
             exit $result
            ) >/dev/null 2>/dev/null
            case $? in
              0) gl_cv_func_printf_enomem="yes" ;;
              77) gl_cv_func_printf_enomem="guessing no" ;;
              *) gl_cv_func_printf_enomem="no" ;;
            esac
          else
            gl_cv_func_printf_enomem="guessing no"
          fi
          rm -fr conftest*
        else
          dnl A universal build on Apple MacOS X platforms.
          dnl The result would be 'no' in 32-bit mode and 'yes' in 64-bit mode.
          dnl But we need a configuration result that is valid in both modes.
          gl_cv_func_printf_enomem="guessing no"
        fi
      fi
      if test "$gl_cv_func_printf_enomem" = "guessing no"; then
changequote(,)dnl
        case "$host_os" in
                    # Guess yes on glibc systems.
          *-gnu*)   gl_cv_func_printf_enomem="guessing yes";;
                    # Guess yes on Solaris.
          solaris*) gl_cv_func_printf_enomem="guessing yes";;
                    # Guess yes on AIX.
          aix*)     gl_cv_func_printf_enomem="guessing yes";;
                    # Guess yes on HP-UX/hppa.
          hpux*)    case "$host_cpu" in
                      hppa*) gl_cv_func_printf_enomem="guessing yes";;
                      *)     gl_cv_func_printf_enomem="guessing no";;
                    esac
                    ;;
                    # Guess yes on IRIX.
          irix*)    gl_cv_func_printf_enomem="guessing yes";;
                    # Guess yes on OSF/1.
          osf*)     gl_cv_func_printf_enomem="guessing yes";;
                    # Guess yes on BeOS.
          beos*)    gl_cv_func_printf_enomem="guessing yes";;
                    # Guess yes on Haiku.
          haiku*)   gl_cv_func_printf_enomem="guessing yes";;
                    # If we don't know, assume the worst.
          *)        gl_cv_func_printf_enomem="guessing no";;
        esac
changequote([,])dnl
      fi
    ])
])

dnl Test whether the snprintf function exists. (ISO C99, POSIX:2001)
dnl Result is ac_cv_func_snprintf.

AC_DEFUN([gl_SNPRINTF_PRESENCE],
[
  AC_CHECK_FUNCS_ONCE([snprintf])
])

dnl Test whether the string produced by the snprintf function is always NUL
dnl terminated. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_snprintf_truncation_c99.

AC_DEFUN([gl_SNPRINTF_TRUNCATION_C99],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether snprintf truncates the result as in C99],
    [gl_cv_func_snprintf_truncation_c99],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[100];
int main ()
{
  strcpy (buf, "ABCDEF");
  snprintf (buf, 3, "%d %d", 4567, 89);
  if (memcmp (buf, "45\0DEF", 6) != 0)
    return 1;
  return 0;
}], [gl_cv_func_snprintf_truncation_c99=yes], [gl_cv_func_snprintf_truncation_c99=no],
      [
changequote(,)dnl
       case "$host_os" in
                               # Guess yes on glibc systems.
         *-gnu*)               gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on FreeBSD >= 5.
         freebsd[1-4]*)        gl_cv_func_snprintf_truncation_c99="guessing no";;
         freebsd* | kfreebsd*) gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on MacOS X >= 10.3.
         darwin[1-6].*)        gl_cv_func_snprintf_truncation_c99="guessing no";;
         darwin*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on OpenBSD >= 3.9.
         openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
                               gl_cv_func_snprintf_truncation_c99="guessing no";;
         openbsd*)             gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on Solaris >= 2.6.
         solaris2.[0-5]*)      gl_cv_func_snprintf_truncation_c99="guessing no";;
         solaris*)             gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on AIX >= 4.
         aix[1-3]*)            gl_cv_func_snprintf_truncation_c99="guessing no";;
         aix*)                 gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on HP-UX >= 11.
         hpux[7-9]* | hpux10*) gl_cv_func_snprintf_truncation_c99="guessing no";;
         hpux*)                gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on IRIX >= 6.5.
         irix6.5)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on OSF/1 >= 5.
         osf[3-4]*)            gl_cv_func_snprintf_truncation_c99="guessing no";;
         osf*)                 gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on NetBSD >= 3.
         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
                               gl_cv_func_snprintf_truncation_c99="guessing no";;
         netbsd*)              gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # Guess yes on BeOS.
         beos*)                gl_cv_func_snprintf_truncation_c99="guessing yes";;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_snprintf_truncation_c99="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the return value of the snprintf function is the number
dnl of bytes (excluding the terminating NUL) that would have been produced
dnl if the buffer had been large enough. (ISO C99, POSIX:2001)
dnl For example, this test program fails on IRIX 6.5:
dnl     ---------------------------------------------------------------------
dnl     #include <stdio.h>
dnl     int main()
dnl     {
dnl       static char buf[8];
dnl       int retval = snprintf (buf, 3, "%d", 12345);
dnl       return retval >= 0 && retval < 3;
dnl     }
dnl     ---------------------------------------------------------------------
dnl Result is gl_cv_func_snprintf_retval_c99.

AC_DEFUN([gl_SNPRINTF_RETVAL_C99],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether snprintf returns a byte count as in C99],
    [gl_cv_func_snprintf_retval_c99],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char buf[100];
int main ()
{
  strcpy (buf, "ABCDEF");
  if (snprintf (buf, 3, "%d %d", 4567, 89) != 7)
    return 1;
  return 0;
}], [gl_cv_func_snprintf_retval_c99=yes], [gl_cv_func_snprintf_retval_c99=no],
      [
changequote(,)dnl
       case "$host_os" in
                               # Guess yes on glibc systems.
         *-gnu*)               gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # Guess yes on FreeBSD >= 5.
         freebsd[1-4]*)        gl_cv_func_snprintf_retval_c99="guessing no";;
         freebsd* | kfreebsd*) gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # Guess yes on MacOS X >= 10.3.
         darwin[1-6].*)        gl_cv_func_snprintf_retval_c99="guessing no";;
         darwin*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # Guess yes on OpenBSD >= 3.9.
         openbsd[1-2].* | openbsd3.[0-8] | openbsd3.[0-8].*)
                               gl_cv_func_snprintf_retval_c99="guessing no";;
         openbsd*)             gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # Guess yes on Solaris >= 2.6.
         solaris2.[0-5]*)      gl_cv_func_snprintf_retval_c99="guessing no";;
         solaris*)             gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # Guess yes on AIX >= 4.
         aix[1-3]*)            gl_cv_func_snprintf_retval_c99="guessing no";;
         aix*)                 gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # Guess yes on NetBSD >= 3.
         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
                               gl_cv_func_snprintf_retval_c99="guessing no";;
         netbsd*)              gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # Guess yes on BeOS.
         beos*)                gl_cv_func_snprintf_retval_c99="guessing yes";;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_snprintf_retval_c99="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the snprintf function supports the %n format directive
dnl also in truncated portions of the format string. (ISO C99, POSIX:2001)
dnl Result is gl_cv_func_snprintf_directive_n.

AC_DEFUN([gl_SNPRINTF_DIRECTIVE_N],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether snprintf fully supports the 'n' directive],
    [gl_cv_func_snprintf_directive_n],
    [
      AC_TRY_RUN([
#include <stdio.h>
#include <string.h>
static char fmtstring[10];
static char buf[100];
int main ()
{
  int count = -1;
  /* Copy the format string.  Some systems (glibc with _FORTIFY_SOURCE=2)
     support %n in format strings in read-only memory but not in writable
     memory.  */
  strcpy (fmtstring, "%d %n");
  snprintf (buf, 4, fmtstring, 12345, &count, 33, 44, 55);
  if (count != 6)
    return 1;
  return 0;
}], [gl_cv_func_snprintf_directive_n=yes], [gl_cv_func_snprintf_directive_n=no],
      [
changequote(,)dnl
       case "$host_os" in
                               # Guess yes on glibc systems.
         *-gnu*)               gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on FreeBSD >= 5.
         freebsd[1-4]*)        gl_cv_func_snprintf_directive_n="guessing no";;
         freebsd* | kfreebsd*) gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on MacOS X >= 10.3.
         darwin[1-6].*)        gl_cv_func_snprintf_directive_n="guessing no";;
         darwin*)              gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on Solaris >= 2.6.
         solaris2.[0-5]*)      gl_cv_func_snprintf_directive_n="guessing no";;
         solaris*)             gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on AIX >= 4.
         aix[1-3]*)            gl_cv_func_snprintf_directive_n="guessing no";;
         aix*)                 gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on IRIX >= 6.5.
         irix6.5)              gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on OSF/1 >= 5.
         osf[3-4]*)            gl_cv_func_snprintf_directive_n="guessing no";;
         osf*)                 gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on NetBSD >= 3.
         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
                               gl_cv_func_snprintf_directive_n="guessing no";;
         netbsd*)              gl_cv_func_snprintf_directive_n="guessing yes";;
                               # Guess yes on BeOS.
         beos*)                gl_cv_func_snprintf_directive_n="guessing yes";;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_snprintf_directive_n="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl Test whether the snprintf function, when passed a size = 1, writes any
dnl output without bounds in this case, behaving like sprintf. This is the
dnl case on Linux libc5.
dnl Result is gl_cv_func_snprintf_size1.

AC_DEFUN([gl_SNPRINTF_SIZE1],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_CACHE_CHECK([whether snprintf respects a size of 1],
    [gl_cv_func_snprintf_size1],
    [
      AC_TRY_RUN([
#include <stdio.h>
int main()
{
  static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
  snprintf (buf, 1, "%d", 12345);
  return buf[1] != 'E';
}],
      [gl_cv_func_snprintf_size1=yes],
      [gl_cv_func_snprintf_size1=no],
      [gl_cv_func_snprintf_size1="guessing yes"])
    ])
])

dnl Test whether the vsnprintf function, when passed a zero size, produces no
dnl output. (ISO C99, POSIX:2001)
dnl For example, snprintf nevertheless writes a NUL byte in this case
dnl on OSF/1 5.1:
dnl     ---------------------------------------------------------------------
dnl     #include <stdio.h>
dnl     int main()
dnl     {
dnl       static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
dnl       snprintf (buf, 0, "%d", 12345);
dnl       return buf[0] != 'D';
dnl     }
dnl     ---------------------------------------------------------------------
dnl And vsnprintf writes any output without bounds in this case, behaving like
dnl vsprintf, on HP-UX 11 and OSF/1 5.1:
dnl     ---------------------------------------------------------------------
dnl     #include <stdarg.h>
dnl     #include <stdio.h>
dnl     static int my_snprintf (char *buf, int size, const char *format, ...)
dnl     {
dnl       va_list args;
dnl       int ret;
dnl       va_start (args, format);
dnl       ret = vsnprintf (buf, size, format, args);
dnl       va_end (args);
dnl       return ret;
dnl     }
dnl     int main()
dnl     {
dnl       static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
dnl       my_snprintf (buf, 0, "%d", 12345);
dnl       return buf[0] != 'D';
dnl     }
dnl     ---------------------------------------------------------------------
dnl Result is gl_cv_func_vsnprintf_zerosize_c99.

AC_DEFUN([gl_VSNPRINTF_ZEROSIZE_C99],
[
  AC_REQUIRE([AC_PROG_CC])
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_CACHE_CHECK([whether vsnprintf respects a zero size as in C99],
    [gl_cv_func_vsnprintf_zerosize_c99],
    [
      AC_TRY_RUN([
#include <stdarg.h>
#include <stdio.h>
static int my_snprintf (char *buf, int size, const char *format, ...)
{
  va_list args;
  int ret;
  va_start (args, format);
  ret = vsnprintf (buf, size, format, args);
  va_end (args);
  return ret;
}
int main()
{
  static char buf[8] = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F' };
  my_snprintf (buf, 0, "%d", 12345);
  return buf[0] != 'D';
}],
      [gl_cv_func_vsnprintf_zerosize_c99=yes],
      [gl_cv_func_vsnprintf_zerosize_c99=no],
      [
changequote(,)dnl
       case "$host_os" in
                               # Guess yes on glibc systems.
         *-gnu*)               gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on FreeBSD >= 5.
         freebsd[1-4]*)        gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
         freebsd* | kfreebsd*) gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on MacOS X >= 10.3.
         darwin[1-6].*)        gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
         darwin*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on Cygwin.
         cygwin*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on Solaris >= 2.6.
         solaris2.[0-5]*)      gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
         solaris*)             gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on AIX >= 4.
         aix[1-3]*)            gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
         aix*)                 gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on IRIX >= 6.5.
         irix6.5)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on NetBSD >= 3.
         netbsd[1-2]* | netbsdelf[1-2]* | netbsdaout[1-2]* | netbsdcoff[1-2]*)
                               gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
         netbsd*)              gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on BeOS.
         beos*)                gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # Guess yes on mingw.
         mingw* | pw*)         gl_cv_func_vsnprintf_zerosize_c99="guessing yes";;
                               # If we don't know, assume the worst.
         *)                    gl_cv_func_vsnprintf_zerosize_c99="guessing no";;
       esac
changequote([,])dnl
      ])
    ])
])

dnl The results of these tests on various platforms are:
dnl
dnl 1 = gl_PRINTF_SIZES_C99
dnl 2 = gl_PRINTF_LONG_DOUBLE
dnl 3 = gl_PRINTF_INFINITE
dnl 4 = gl_PRINTF_INFINITE_LONG_DOUBLE
dnl 5 = gl_PRINTF_DIRECTIVE_A
dnl 6 = gl_PRINTF_DIRECTIVE_F
dnl 7 = gl_PRINTF_DIRECTIVE_N
dnl 8 = gl_PRINTF_DIRECTIVE_LS
dnl 9 = gl_PRINTF_POSITIONS
dnl 10 = gl_PRINTF_FLAG_GROUPING
dnl 11 = gl_PRINTF_FLAG_LEFTADJUST
dnl 12 = gl_PRINTF_FLAG_ZERO
dnl 13 = gl_PRINTF_PRECISION
dnl 14 = gl_PRINTF_ENOMEM
dnl 15 = gl_SNPRINTF_PRESENCE
dnl 16 = gl_SNPRINTF_TRUNCATION_C99
dnl 17 = gl_SNPRINTF_RETVAL_C99
dnl 18 = gl_SNPRINTF_DIRECTIVE_N
dnl 19 = gl_SNPRINTF_SIZE1
dnl 20 = gl_VSNPRINTF_ZEROSIZE_C99
dnl
dnl 1 = checking whether printf supports size specifiers as in C99...
dnl 2 = checking whether printf supports 'long double' arguments...
dnl 3 = checking whether printf supports infinite 'double' arguments...
dnl 4 = checking whether printf supports infinite 'long double' arguments...
dnl 5 = checking whether printf supports the 'a' and 'A' directives...
dnl 6 = checking whether printf supports the 'F' directive...
dnl 7 = checking whether printf supports the 'n' directive...
dnl 8 = checking whether printf supports the 'ls' directive...
dnl 9 = checking whether printf supports POSIX/XSI format strings with positions...
dnl 10 = checking whether printf supports the grouping flag...
dnl 11 = checking whether printf supports the left-adjust flag correctly...
dnl 12 = checking whether printf supports the zero flag correctly...
dnl 13 = checking whether printf supports large precisions...
dnl 14 = checking whether printf survives out-of-memory conditions...
dnl 15 = checking for snprintf...
dnl 16 = checking whether snprintf truncates the result as in C99...
dnl 17 = checking whether snprintf returns a byte count as in C99...
dnl 18 = checking whether snprintf fully supports the 'n' directive...
dnl 19 = checking whether snprintf respects a size of 1...
dnl 20 = checking whether vsnprintf respects a zero size as in C99...
dnl
dnl . = yes, # = no.
dnl
dnl                                  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
dnl   glibc 2.5                      .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
dnl   glibc 2.3.6                    .  .  .  .  #  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .
dnl   FreeBSD 5.4, 6.1               .  .  .  .  #  .  .  .  .  .  .  #  .  #  .  .  .  .  .  .
dnl   MacOS X 10.3.9                 .  .  .  .  #  .  .  .  .  .  .  #  .  #  .  .  .  .  .  .
dnl   OpenBSD 3.9, 4.0               .  .  #  #  #  #  .  #  .  #  .  #  .  #  .  .  .  .  .  .
dnl   Cygwin 1.7.0 (2009)            .  .  .  #  .  .  .  ?  .  .  .  .  .  ?  .  .  .  .  .  .
dnl   Cygwin 1.5.25 (2008)           .  .  .  #  #  .  .  #  .  .  .  .  .  #  .  .  .  .  .  .
dnl   Cygwin 1.5.19 (2006)           #  .  .  #  #  #  .  #  .  #  .  #  #  #  .  .  .  .  .  .
dnl   Solaris 10                     .  .  #  #  #  .  .  #  .  .  .  #  .  .  .  .  .  .  .  .
dnl   Solaris 2.6 ... 9              #  .  #  #  #  #  .  #  .  .  .  #  .  .  .  .  .  .  .  .
dnl   Solaris 2.5.1                  #  .  #  #  #  #  .  #  .  .  .  #  .  .  #  #  #  #  #  #
dnl   AIX 5.2                        .  .  #  #  #  .  .  .  .  .  .  #  .  .  .  .  .  .  .  .
dnl   AIX 4.3.2, 5.1                 #  .  #  #  #  #  .  .  .  .  .  #  .  .  .  .  .  .  .  .
dnl   HP-UX 11.31                    .  .  .  .  #  .  .  .  .  .  .  #  .  .  .  .  #  #  .  .
dnl   HP-UX 11.{00,11,23}            #  .  .  .  #  #  .  .  .  .  .  #  .  .  .  .  #  #  .  #
dnl   HP-UX 10.20                    #  .  #  .  #  #  .  ?  .  .  #  #  .  .  .  .  #  #  ?  #
dnl   IRIX 6.5                       #  .  #  #  #  #  .  #  .  .  .  #  .  .  .  .  #  .  .  .
dnl   OSF/1 5.1                      #  .  #  #  #  #  .  .  .  .  .  #  .  .  .  .  #  .  .  #
dnl   OSF/1 4.0d                     #  .  #  #  #  #  .  .  .  .  .  #  .  .  #  #  #  #  #  #
dnl   NetBSD 4.0                     .  ?  ?  ?  ?  ?  .  ?  .  ?  ?  ?  ?  ?  .  .  .  ?  ?  ?
dnl   NetBSD 3.0                     .  .  .  .  #  #  .  ?  #  #  ?  #  .  #  .  .  .  .  .  .
dnl   Haiku                          .  .  .  #  #  #  .  #  .  .  .  .  .  ?  .  .  .  .  .  .
dnl   BeOS                           #  #  .  #  #  #  .  ?  #  .  ?  .  #  ?  .  .  .  .  .  .
dnl   mingw                          #  #  #  #  #  #  .  .  #  #  .  #  #  ?  .  #  #  #  .  .


code:
# putenv.m4 serial 16
dnl Copyright (C) 2002-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Jim Meyering.
dnl
dnl Check whether putenv ("FOO") removes FOO from the environment.
dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that.

AC_DEFUN([gl_FUNC_PUTENV],
[
  AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
  AC_CACHE_CHECK([for putenv compatible with GNU and SVID],
   [gl_cv_func_svid_putenv],
   [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[[
    /* Put it in env.  */
    if (putenv ("CONFTEST_putenv=val"))
      return 1;

    /* Try to remove it.  */
    if (putenv ("CONFTEST_putenv"))
      return 1;

    /* Make sure it was deleted.  */
    if (getenv ("CONFTEST_putenv") != 0)
      return 1;

    return 0;
              ]])],
             gl_cv_func_svid_putenv=yes,
             gl_cv_func_svid_putenv=no,
             dnl When crosscompiling, assume putenv is broken.
             gl_cv_func_svid_putenv=no)
   ])
  if test $gl_cv_func_svid_putenv = no; then
    REPLACE_PUTENV=1
    AC_LIBOBJ([putenv])
  fi
])


code:
# readlink.m4 serial 9
dnl Copyright (C) 2003, 2007, 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_READLINK],
[
  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  AC_CHECK_FUNCS_ONCE([readlink])
  if test $ac_cv_func_readlink = no; then
    HAVE_READLINK=0
    AC_LIBOBJ([readlink])
    gl_PREREQ_READLINK
  else
    AC_CACHE_CHECK([whether readlink signature is correct],
      [gl_cv_decl_readlink_works],
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM(
           [[#include <unistd.h>
      /* Cause compilation failure if original declaration has wrong type.  */
      ssize_t readlink (const char *, char *, size_t);]])],
         [gl_cv_decl_readlink_works=yes], [gl_cv_decl_readlink_works=no])])
    dnl Solaris 9 ignores trailing slash.
    dnl FreeBSD 7.2 dereferences only one level of links with trailing slash.
    AC_CACHE_CHECK([whether readlink handles trailing slash correctly],
      [gl_cv_func_readlink_works],
      [# We have readlink, so assume ln -s works.
       ln -s conftest.no-such conftest.link
       ln -s conftest.link conftest.lnk2
       AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
           [[#include <unistd.h>
]], [[char buf[20];
      return readlink ("conftest.lnk2/", buf, sizeof buf) != -1;]])],
         [gl_cv_func_readlink_works=yes], [gl_cv_func_readlink_works=no],
         [gl_cv_func_readlink_works="guessing no"])
      rm -f conftest.link conftest.lnk2])
    if test "$gl_cv_func_readlink_works" != yes; then
      AC_DEFINE([READLINK_TRAILING_SLASH_BUG], [1], [Define to 1 if readlink
        fails to recognize a trailing slash.])
      REPLACE_READLINK=1
      AC_LIBOBJ([readlink])
    elif test "$gl_cv_decl_readlink_works" != yes; then
      REPLACE_READLINK=1
      AC_LIBOBJ([readlink])
    fi
  fi
])

# Like gl_FUNC_READLINK, except prepare for separate compilation (no AC_LIBOBJ).
AC_DEFUN([gl_FUNC_READLINK_SEPARATE],
[
  AC_CHECK_FUNCS_ONCE([readlink])
  gl_PREREQ_READLINK
])

# Prerequisites of lib/readlink.c.
AC_DEFUN([gl_PREREQ_READLINK],
[
  :
])


code:
# safe-read.m4 serial 5
dnl Copyright (C) 2002-2003, 2005-2006, 2009-2010 Free Software Foundation,
dnl Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_SAFE_READ],
[
  AC_LIBOBJ([safe-read])

  gl_PREREQ_SAFE_READ
])

# Prerequisites of lib/safe-read.c.
AC_DEFUN([gl_PREREQ_SAFE_READ],
[
  AC_REQUIRE([gt_TYPE_SSIZE_T])
])


code:
# safe-write.m4 serial 3
dnl Copyright (C) 2002, 2005-2006, 2009-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_SAFE_WRITE],
[
  AC_LIBOBJ([safe-write])

  gl_PREREQ_SAFE_WRITE
])

# Prerequisites of lib/safe-write.c.
AC_DEFUN([gl_PREREQ_SAFE_WRITE],
[
  gl_PREREQ_SAFE_READ
])


code:
# servent.m4 serial 1
dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_SERVENT],
[
  dnl Where are getservent(), setservent(), endservent(), getservbyname(),
  dnl getservbyport() defined?
  dnl Where are getprotoent(), setprotoent(), endprotoent(), getprotobyname(),
  dnl getprotobynumber() defined?
  dnl - On Solaris, they are in libsocket. Ignore libxnet.
  dnl - On Haiku, they are in libnetwork.
  dnl - On BeOS, they are in libnet.
  dnl - On native Windows, they are in ws2_32.dll.
  dnl - Otherwise they are in libc.
  AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl for HAVE_SYS_SOCKET_H, HAVE_WINSOCK2_H
  SERVENT_LIB=
  gl_saved_libs="$LIBS"
  AC_SEARCH_LIBS([getservbyname], [socket network net],
    [if test "$ac_cv_search_getservbyname" != "none required"; then
       SERVENT_LIB="$ac_cv_search_getservbyname"
     fi])
  LIBS="$gl_saved_libs"
  if test -z "$SERVENT_LIB"; then
    AC_CHECK_FUNCS([getservbyname], , [
      AC_CACHE_CHECK([for getservbyname in winsock2.h and -lws2_32],
        [gl_cv_w32_getservbyname],
        [gl_cv_w32_getservbyname=no
         gl_save_LIBS="$LIBS"
         LIBS="$LIBS -lws2_32"
         AC_TRY_LINK([
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif
#include <stddef.h>
], [getservbyname(NULL,NULL);], [gl_cv_w32_getservbyname=yes])
         LIBS="$gl_save_LIBS"
        ])
      if test "$gl_cv_w32_getservbyname" = "yes"; then
        SERVENT_LIB="-lws2_32"
      fi
    ])
  fi
  AC_SUBST([SERVENT_LIB])
])


code:
# size_max.m4 serial 9
dnl Copyright (C) 2003, 2005-2006, 2008-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Bruno Haible.

AC_DEFUN([gl_SIZE_MAX],
[
  AC_CHECK_HEADERS([stdint.h])
  dnl First test whether the system already has SIZE_MAX.
  AC_CACHE_CHECK([for SIZE_MAX], [gl_cv_size_max], [
    gl_cv_size_max=
    AC_EGREP_CPP([Found it], [
#include <limits.h>
#if HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef SIZE_MAX
Found it
#endif
], [gl_cv_size_max=yes])
    if test -z "$gl_cv_size_max"; then
      dnl Define it ourselves. Here we assume that the type 'size_t' is not wider
      dnl than the type 'unsigned long'. Try hard to find a definition that can
      dnl be used in a preprocessor #if, i.e. doesn't contain a cast.
      AC_COMPUTE_INT([size_t_bits_minus_1], [sizeof (size_t) * CHAR_BIT - 1],
        [#include <stddef.h>
#include <limits.h>], [size_t_bits_minus_1=])
      AC_COMPUTE_INT([fits_in_uint], [sizeof (size_t) <= sizeof (unsigned int)],
        [#include <stddef.h>], [fits_in_uint=])
      if test -n "$size_t_bits_minus_1" && test -n "$fits_in_uint"; then
        if test $fits_in_uint = 1; then
          dnl Even though SIZE_MAX fits in an unsigned int, it must be of type
          dnl 'unsigned long' if the type 'size_t' is the same as 'unsigned long'.
          AC_TRY_COMPILE([#include <stddef.h>
            extern size_t foo;
            extern unsigned long foo;
            ], [], [fits_in_uint=0])
        fi
        dnl We cannot use 'expr' to simplify this expression, because 'expr'
        dnl works only with 'long' integers in the host environment, while we
        dnl might be cross-compiling from a 32-bit platform to a 64-bit platform.
        if test $fits_in_uint = 1; then
          gl_cv_size_max="(((1U << $size_t_bits_minus_1) - 1) * 2 + 1)"
        else
          gl_cv_size_max="(((1UL << $size_t_bits_minus_1) - 1) * 2 + 1)"
        fi
      else
        dnl Shouldn't happen, but who knows...
        gl_cv_size_max='((size_t)~(size_t)0)'
      fi
    fi
  ])
  if test "$gl_cv_size_max" != yes; then
    AC_DEFINE_UNQUOTED([SIZE_MAX], [$gl_cv_size_max],
      [Define as the maximum value of type 'size_t', if the system doesn't define it.])
  fi
  dnl Don't redefine SIZE_MAX in config.h if config.h is re-included after
  dnl <stdint.h>. Remember that the #undef in AH_VERBATIM gets replaced with
  dnl #define by AC_DEFINE_UNQUOTED.
  AH_VERBATIM([SIZE_MAX],
[/* Define as the maximum value of type 'size_t', if the system doesn't define
   it. */
#ifndef SIZE_MAX
# undef SIZE_MAX
#endif])
])

dnl Autoconf >= 2.61 has AC_COMPUTE_INT built-in.
dnl Remove this when we can assume autoconf >= 2.61.
m4_ifdef([AC_COMPUTE_INT], [], [
  AC_DEFUN([AC_COMPUTE_INT], [_AC_COMPUTE_INT([$2],[$1],[$3],[$4])])
])


code:
# snprintf.m4 serial 5
dnl Copyright (C) 2002-2004, 2007-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_SNPRINTF],
[
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  gl_cv_func_snprintf_usable=no
  AC_CHECK_FUNCS([snprintf])
  if test $ac_cv_func_snprintf = yes; then
    gl_SNPRINTF_SIZE1
    case "$gl_cv_func_snprintf_size1" in
      *yes)
        gl_cv_func_snprintf_usable=yes
        ;;
    esac
  fi
  if test $gl_cv_func_snprintf_usable = no; then
    gl_REPLACE_SNPRINTF
  fi
  AC_CHECK_DECLS_ONCE([snprintf])
  if test $ac_cv_have_decl_snprintf = no; then
    HAVE_DECL_SNPRINTF=0
  fi
])

AC_DEFUN([gl_REPLACE_SNPRINTF],
[
  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  AC_LIBOBJ([snprintf])
  if test $ac_cv_func_snprintf = yes; then
    REPLACE_SNPRINTF=1
  fi
  gl_PREREQ_SNPRINTF
])

# Prerequisites of lib/snprintf.c.
AC_DEFUN([gl_PREREQ_SNPRINTF], [:])


code:
# socklen.m4 serial 7
dnl Copyright (C) 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Albert Chin, Windows fixes from Simon Josefsson.

dnl Check for socklen_t: historically on BSD it is an int, and in
dnl POSIX 1g it is a type of its own, but some platforms use different
dnl types for the argument to getsockopt, getpeername, etc.  So we
dnl have to test to find something that will work.

dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
dnl it there first.  That file is included by gnulib's sys_socket.in.h, which
dnl all users of this module should include.  Cygwin must not include
dnl ws2tcpip.h.
AC_DEFUN([gl_TYPE_SOCKLEN_T],
  [AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl
   AC_CHECK_TYPE([socklen_t], ,
     [AC_MSG_CHECKING([for socklen_t equivalent])
      AC_CACHE_VAL([gl_cv_socklen_t_equiv],
        [# Systems have either "struct sockaddr *" or
         # "void *" as the second argument to getpeername
         gl_cv_socklen_t_equiv=
         for arg2 in "struct sockaddr" void; do
           for t in int size_t "unsigned int" "long int" "unsigned long int"; do
             AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
                 [[#include <sys/types.h>
                   #include <sys/socket.h>

                   int getpeername (int, $arg2 *, $t *);]],
                 [[$t len;
                  getpeername (0, 0, &len);]])],
               [gl_cv_socklen_t_equiv="$t"])
             test "$gl_cv_socklen_t_equiv" != "" && break
           done
           test "$gl_cv_socklen_t_equiv" != "" && break
         done
      ])
      if test "$gl_cv_socklen_t_equiv" = ""; then
        AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
      fi
      AC_MSG_RESULT([$gl_cv_socklen_t_equiv])
      AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
        [type to use in place of socklen_t if not defined])],
     [#include <sys/types.h>
      #if HAVE_SYS_SOCKET_H
      # include <sys/socket.h>
      #elif HAVE_WS2TCPIP_H
      # include <ws2tcpip.h>
      #endif])])


code:
# sockpfaf.m4 serial 7
dnl Copyright (C) 2004, 2006, 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl Test for some common socket protocol families (PF_INET, PF_INET6, ...)
dnl and some common address families (AF_INET, AF_INET6, ...).
dnl This test assumes that a system supports an address family if and only if
dnl it supports the corresponding protocol family.

dnl From Bruno Haible.

AC_DEFUN([gl_SOCKET_FAMILIES],
[
  AC_REQUIRE([gl_HEADER_SYS_SOCKET])
  AC_CHECK_HEADERS_ONCE([netinet/in.h])

  AC_MSG_CHECKING([for IPv4 sockets])
  AC_CACHE_VAL([gl_cv_socket_ipv4],
    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif]],
[[int x = AF_INET; struct in_addr y; struct sockaddr_in z;
 if (&x && &y && &z) return 0;]])],
       gl_cv_socket_ipv4=yes, gl_cv_socket_ipv4=no)])
  AC_MSG_RESULT([$gl_cv_socket_ipv4])
  if test $gl_cv_socket_ipv4 = yes; then
    AC_DEFINE([HAVE_IPV4], [1], [Define to 1 if <sys/socket.h> defines AF_INET.])
  fi

  AC_MSG_CHECKING([for IPv6 sockets])
  AC_CACHE_VAL([gl_cv_socket_ipv6],
    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_WINSOCK2_H
#include <winsock2.h>
#endif]],
[[int x = AF_INET6; struct in6_addr y; struct sockaddr_in6 z;
 if (&x && &y && &z) return 0;]])],
       gl_cv_socket_ipv6=yes, gl_cv_socket_ipv6=no)])
  AC_MSG_RESULT([$gl_cv_socket_ipv6])
  if test $gl_cv_socket_ipv6 = yes; then
    AC_DEFINE([HAVE_IPV6], [1], [Define to 1 if <sys/socket.h> defines AF_INET6.])
  fi
])


code:
# ssize_t.m4 serial 4 (gettext-0.15)
dnl Copyright (C) 2001-2003, 2006, 2009-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Bruno Haible.
dnl Test whether ssize_t is defined.

AC_DEFUN([gt_TYPE_SSIZE_T],
[
  AC_CACHE_CHECK([for ssize_t], [gt_cv_ssize_t],
    [AC_TRY_COMPILE([#include <sys/types.h>],
       [int x = sizeof (ssize_t *) + sizeof (ssize_t);
        return !x;],
       [gt_cv_ssize_t=yes], [gt_cv_ssize_t=no])])
  if test $gt_cv_ssize_t = no; then
    AC_DEFINE([ssize_t], [int],
              [Define as a signed type of the same size as size_t.])
  fi
])


code:
# serial 4

# Copyright (C) 2009, 2010 Free Software Foundation, Inc.
#
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_STAT],
[
  AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  AC_REQUIRE([gl_AC_DOS])
  AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
  AC_CHECK_FUNCS_ONCE([lstat])
  dnl mingw is the only known platform where stat(".") and stat("./") differ
  AC_CACHE_CHECK([whether stat handles trailing slashes on directories],
      [gl_cv_func_stat_dir_slash],
      [AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
           [[#include <sys/stat.h>
]], [[struct stat st; return stat (".", &st) != stat ("./", &st);]])],
         [gl_cv_func_stat_dir_slash=yes], [gl_cv_func_stat_dir_slash=no],
         [case $host_os in
            mingw*) gl_cv_func_stat_dir_slash="guessing no";;
            *) gl_cv_func_stat_dir_slash="guessing yes";;
          esac])])
  dnl Solaris 9 mistakenly succeeds on stat("file/")
  dnl FreeBSD 7.2 mistakenly succeeds on stat("link-to-file/")
  AC_CACHE_CHECK([whether stat handles trailing slashes on files],
      [gl_cv_func_stat_file_slash],
      [touch conftest.tmp
       # Assume that if we have lstat, we can also check symlinks.
       if test $ac_cv_func_lstat = yes; then
         ln -s conftest.tmp conftest.lnk
       fi
       AC_RUN_IFELSE(
         [AC_LANG_PROGRAM(
           [[#include <sys/stat.h>
]], [[struct stat st;
      if (!stat ("conftest.tmp/", &st)) return 1;
#if HAVE_LSTAT
      if (!stat ("conftest.lnk/", &st)) return 2;
#endif
           ]])],
         [gl_cv_func_stat_file_slash=yes], [gl_cv_func_stat_file_slash=no],
         [gl_cv_func_stat_file_slash="guessing no"])
       rm -f conftest.tmp conftest.lnk])
  case $gl_cv_func_stat_dir_slash in
    *no) REPLACE_STAT=1
      AC_DEFINE([REPLACE_FUNC_STAT_DIR], [1], [Define to 1 if stat needs
        help when passed a directory name with a trailing slash]);;
  esac
  case $gl_cv_func_stat_file_slash in
    *no) REPLACE_STAT=1
      AC_DEFINE([REPLACE_FUNC_STAT_FILE], [1], [Define to 1 if stat needs
        help when passed a file name with a trailing slash]);;
  esac
  if test $REPLACE_STAT = 1; then
    AC_LIBOBJ([stat])
    dnl Prerequisites of lib/stat.c.
    AC_REQUIRE([AC_C_INLINE])
  fi
])


code:
# stdarg.m4 serial 3
dnl Copyright (C) 2006, 2008-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Bruno Haible.
dnl Provide a working va_copy in combination with <stdarg.h>.

AC_DEFUN([gl_STDARG_H],
[
  STDARG_H='';                AC_SUBST([STDARG_H])
  NEXT_STDARG_H='<stdarg.h>'; AC_SUBST([NEXT_STDARG_H])
  AC_MSG_CHECKING([for va_copy])
  AC_CACHE_VAL([gl_cv_func_va_copy], [
    AC_TRY_COMPILE([#include <stdarg.h>], [
#ifndef va_copy
void (*func) (va_list, va_list) = va_copy;
#endif
],
      [gl_cv_func_va_copy=yes], [gl_cv_func_va_copy=no])])
  AC_MSG_RESULT([$gl_cv_func_va_copy])
  if test $gl_cv_func_va_copy = no; then
    dnl Provide a substitute.
    dnl Usually a simple definition in <config.h> is enough. Not so on AIX 5
    dnl with some versions of the /usr/vac/bin/cc compiler. It has an <stdarg.h>
    dnl which does '#undef va_copy', leading to a missing va_copy symbol. For
    dnl this platform, we use an <stdarg.h> substitute. But we cannot use this
    dnl approach on other platforms, because <stdarg.h> often defines only
    dnl preprocessor macros and gl_ABSOLUTE_HEADER, gl_CHECK_NEXT_HEADERS do
    dnl not work in this situation.
    AC_EGREP_CPP([vaccine],
      [#if defined _AIX && !defined __GNUC__
        AIX vaccine
       #endif
      ], [gl_aixcc=yes], [gl_aixcc=no])
    if test $gl_aixcc = yes; then
      dnl Provide a substitute <stdarg.h> file.
      STDARG_H=stdarg.h
      gl_CHECK_NEXT_HEADERS([stdarg.h])
      dnl Fallback for the case when <stdarg.h> contains only macro definitions.
      if test "$gl_cv_next_stdarg_h" = '""'; then
        gl_cv_next_stdarg_h='"///usr/include/stdarg.h"'
        NEXT_STDARG_H="$gl_cv_next_stdarg_h"
      fi
    else
      dnl Provide a substitute in <config.h>, either __va_copy or as a simple
      dnl assignment.
      gl_CACHE_VAL_SILENT([gl_cv_func___va_copy], [
        AC_TRY_COMPILE([#include <stdarg.h>], [
#ifndef __va_copy
error, bail out
#endif
],
          [gl_cv_func___va_copy=yes], [gl_cv_func___va_copy=no])])
      if test $gl_cv_func___va_copy = yes; then
        AC_DEFINE([va_copy], [__va_copy],
          [Define as a macro for copying va_list variables.])
      else
        AH_VERBATIM([gl_VA_COPY], [/* A replacement for va_copy, if needed.  */
#define gl_va_copy(a,b) ((a) = (b))])
        AC_DEFINE([va_copy], [gl_va_copy],
          [Define as a macro for copying va_list variables.])
      fi
    fi
  fi
])


code:
# Check for stdbool.h that conforms to C99.

dnl Copyright (C) 2002-2006, 2009-2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# Prepare for substituting <stdbool.h> if it is not supported.

AC_DEFUN([AM_STDBOOL_H],
[
  AC_REQUIRE([AC_HEADER_STDBOOL])

  # Define two additional variables used in the Makefile substitution.

  if test "$ac_cv_header_stdbool_h" = yes; then
    STDBOOL_H=''
  else
    STDBOOL_H='stdbool.h'
  fi
  AC_SUBST([STDBOOL_H])

  if test "$ac_cv_type__Bool" = yes; then
    HAVE__BOOL=1
  else
    HAVE__BOOL=0
  fi
  AC_SUBST([HAVE__BOOL])
])

# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])

# This macro is only needed in autoconf <= 2.59.  Newer versions of autoconf
# have this macro built-in.

AC_DEFUN([AC_HEADER_STDBOOL],
  [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
     [ac_cv_header_stdbool_h],
     [AC_TRY_COMPILE(
        [
          #include <stdbool.h>
          #ifndef bool
           "error: bool is not defined"
          #endif
          #ifndef false
           "error: false is not defined"
          #endif
          #if false
           "error: false is not 0"
          #endif
          #ifndef true
           "error: true is not defined"
          #endif
          #if true != 1
           "error: true is not 1"
          #endif
          #ifndef __bool_true_false_are_defined
           "error: __bool_true_false_are_defined is not defined"
          #endif

          struct s { _Bool s: 1; _Bool t; } s;

          char a[true == 1 ? 1 : -1];
          char b[false == 0 ? 1 : -1];
          char c[__bool_true_false_are_defined == 1 ? 1 : -1];
          char d[(bool) 0.5 == true ? 1 : -1];
          bool e = &s;
          char f[(_Bool) 0.0 == false ? 1 : -1];
          char g[true];
          char h[sizeof (_Bool)];
          char i[sizeof s.t];
          enum { j = false, k = true, l = false * true, m = true * 256 };
          _Bool n[m];
          char o[sizeof n == m * sizeof n[0] ? 1 : -1];
          char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
          #if defined __xlc__ || defined __GNUC__
           /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
              reported by James Lemley on 2005-10-05; see
              http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
              This test is not quite right, since xlc is allowed to
              reject this program, as the initializer for xlcbug is
              not one of the forms that C requires support for.
              However, doing the test right would require a run-time
              test, and that would make cross-compilation harder.
              Let us hope that IBM fixes the xlc bug, and also adds
              support for this kind of constant expression.  In the
              meantime, this test will reject xlc, which is OK, since
              our stdbool.h substitute should suffice.  We also test
              this with GCC, where it should work, to detect more
              quickly whether someone messes up the test in the
              future.  */
           char digs[] = "0123456789";
           int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
          #endif
          /* Catch a bug in an HP-UX C compiler.  See
             http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
             http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
           */
          _Bool q = true;
          _Bool *pq = &q;
        ],
        [
          *pq |= q;
          *pq |= ! q;
          /* Refer to every declared value, to avoid compiler optimizations.  */
          return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
                  + !m + !n + !o + !p + !q + !pq);
        ],
        [ac_cv_header_stdbool_h=yes],
        [ac_cv_header_stdbool_h=no])])
   AC_CHECK_TYPES([_Bool])
   if test $ac_cv_header_stdbool_h = yes; then
     AC_DEFINE([HAVE_STDBOOL_H], [1], [Define to 1 if stdbool.h conforms to C99.])
   fi])


code:
dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
# stddef_h.m4 serial 2
dnl Copyright (C) 2009, 2010 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_STDDEF_H],
[
  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
  AC_REQUIRE([gt_TYPE_WCHAR_T])
  if test $gt_cv_c_wchar_t = no; then
    HAVE_WCHAR_T=0
    STDDEF_H=stddef.h
  fi
  AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
    [gl_cv_decl_null_works],
    [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
      int test[2 * (sizeof NULL == sizeof (void *)) -1];
]])],
      [gl_cv_decl_null_works=yes],
      [gl_cv_decl_null_works=no])])
  if test $gl_cv_decl_null_works = no; then
    REPLACE_NULL=1
    STDDEF_H=stddef.h
  fi
  if test -n "$STDDEF_H"; then
    gl_CHECK_NEXT_HEADERS([stddef.h])
  fi
])

AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
[
  dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
  AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
  gl_MODULE_INDICATOR_SET_VARIABLE([$1])
])

AC_DEFUN([gl_STDDEF_H_DEFAULTS],
[
  dnl Assume proper GNU behavior unless another module says otherwise.
  REPLACE_NULL=0;                AC_SUBST([REPLACE_NULL])
  HAVE_WCHAR_T=1;                AC_SUBST([HAVE_WCHAR_T])
  STDDEF_H='';                   AC_SUBST([STDDEF_H])
])