Set math_errhandling to MATH_ERREXCEPT.  Now that we have fenv.h, we basically support this, subject to gcc's lack of FENV_ACCESS support. In any case, the previous setting of math_errhandling to 0 is not allowed by POSIX.
Set math_errhandling to MATH_ERREXCEPT.  Now that we have fenv.h, we
basically support this, subject to gcc's lack of FENV_ACCESS support.
In any case, the previous setting of math_errhandling to 0 is not
allowed by POSIX.

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