I'm a huge fan of POSIX but POSIX functions should not be used in the
MinGW-w64 CRT code as they are now. Using them in this way creates
mandatory dependencies on additional libraries (e.g. MSVCRT). Since
all libraries ultimately rely on Kernel32, it only makes sense to
replace these POSIX functions with those from Kernel32, especially
since they have almost identical substitutes. See also:
https://support.microsoft.com/en-us/help/99456/win32-equivalents-for-c-run-time-functions
Compling the most simplistic program tells you about everything missing.
> emptymain.c
int main(int argc,char** argv) { return 0; }
> compilation command
i686-w64-mingw32-gcc -o emptymain.exe emptymain.c -nodefaultlibs
-lmingw32 -lkernel32
> examples of undefined POSIX symbols
mingw-w64-crt/crt/crtexe.c:423: `malloc'
mingw-w64-crt/crt/crtexe.c:428: `strlen'
mingw-w64-crt/crt/crtexe.c:429: `malloc'
mingw-w64-crt/crt/crtexe.c:430: `memcpy'
mingw-w64-crt/crt/crtexe.c:342: `exit'
mingw-w64-crt/crt/merr.c:72: `fprintf'
mingw-w64-crt/crt/pseudo-reloc.c:149: `fwrite'
mingw-w64-crt/crt/pseudo-reloc.c:150: `vfprintf'
mingw-w64-crt/crt/pseudo-reloc.c:156: `abort'
mingw-w64-crt/crt/crt_handler.c:many: `signal'
mingw-w64-crt/crt/tlsthrd.c:48: `calloc'
mingw-w64-crt/crt/pesect.c:88: `strncmp'
mingw-w64-crt/crt/tlsthrd.c:87: `free'
mingw-w64-crt/crt/tlsthrd.c:141: `free'
mingw-w64-crt/crt/pesect.c:75: `strlen'
mingw-w64-crt/crt/pesect.c:88: `strncmp'
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