FWIW its  gcc -E   Preprocess only; do not compile, assemble or link

But yes perl does redefine these things, http://perl5.git.perl.org/perl.git/blob/HEAD:/XSUB.h#l563

563 #    define malloc              PerlMem_malloc
564 #    define realloc             PerlMem_realloc
565 #    define free                PerlMem_free

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In reply to Re^4: XS: free() outside of the main thread causes crash on Windows by Anonymous Monk
in thread XS: free() outside of the main thread causes crash on Windows by OlegG

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