<malloc.h> is deprecated on some systems and we gets hundreds of warnings due to including it on (at least) dragonfly and openbsd.
We already do this earlier in system.h: #ifdef HAVE_STDLIB_H # include <stdlib.h> #endif /* When compiling C++ we need to include <cstdlib> as well as <stdlib.h> so that it is processed before we poison "malloc"; otherwise, if a source file uses a standard library header that includes <cstdlib>, we will get an error about 'using std::malloc'. */ #ifdef __cplusplus #include <cstdlib> #endif So if that doesn't already declare malloc/calloc/realloc then the system is from the dark ages and including <malloc.h> is not likely to be all that's needed to build a current GCC! Bootstrapped on linux-gnu, openbsd5.0, dragonfly4.2, and aix7.1.2.0, pre-approved by Richi on IRC, committed to trunk.
commit 5c1eeabb69319ed6fe6ab57621b6dd9a4ff0193b Author: Jonathan Wakely <jwak...@redhat.com> Date: Fri Oct 2 12:25:07 2015 +0100 * system.h (malloc.h): Don't include obsolete header. diff --git a/gcc/system.h b/gcc/system.h index 71867c4..85a66a5 100644 --- a/gcc/system.h +++ b/gcc/system.h @@ -481,18 +481,6 @@ extern char *stpcpy (char *, const char *); int unsetenv(const char *); #endif -#ifdef __cplusplus -} -#endif - -#ifdef HAVE_MALLOC_H -#include <malloc.h> -#endif - -#ifdef __cplusplus -extern "C" { -#endif - #if defined (HAVE_DECL_MALLOC) && !HAVE_DECL_MALLOC extern void *malloc (size_t); #endif