CMakeLists.txt: -O1 in debug build
CMakeLists.txt: -O1 in debug build

/usr/include/features.h:381:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^~~~~~~

rantala/string-sorting,rantala/string-sorting,rantala/string-sorting,rantala/string-sorting