https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79839
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Component|libstdc++ |target Resolution|--- |FIXED Target Milestone|--- |6.2 --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- N.B. with GCC 6 and later you get the same behaviour for <stdlib.h> because that includes <cstdlib> now. My tests on AIX 7.1.3.0 were not the same GCC version, it looks like this was fixed for GCC 6.2.0 by r233029 (and r237394 on trunk). The fixed header now has: # 748 "/home/jwakely/gcc/6/lib/gcc/powerpc-ibm-aix7.2.0.0/6.3.1/include-fixed/stdlib.h" 3 4 extern void *__linux_malloc(size_t); extern void *__linux_realloc(void *, size_t); extern void *__linux_calloc(size_t, size_t); extern void *__linux_valloc(size_t); extern void *malloc(size_t) __asm__("__linux_malloc"); extern void *calloc(size_t, size_t) __asm__("__linux_calloc"); extern void *realloc(void *, size_t) __asm__("__linux_realloc"); extern void *valloc(size_t) __asm__("__linux_valloc"); This is necessary because the C++ standard explicitly forbids malloc and other functions from the C library from being defined as macros, they must be defined as functions.