https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109293
--- Comment #6 from Xi Ruoyao <xry111 at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #5) > Something like this: > diff --git a/fixincludes/configure.ac b/fixincludes/configure.ac > index 14813b910f1..00aeb1ce1d9 100644 > --- a/fixincludes/configure.ac > +++ b/fixincludes/configure.ac > @@ -89,6 +89,7 @@ define(fixincludes_UNLOCKED_FUNCS, clearerr_unlocked > feof_unlocked dnl > putchar_unlocked putc_unlocked) > AC_CHECK_FUNCS(fixincludes_UNLOCKED_FUNCS) > AC_CHECK_DECLS([abort, asprintf, basename(char *), errno, vasprintf]) > +AC_CHECK_DECLS([memmem]) > AC_CHECK_DECLS(m4_split(m4_normalize(fixincludes_UNLOCKED_FUNCS))) > > # Checks for typedefs, structures, and compiler characteristics. > diff --git a/fixincludes/system.h b/fixincludes/system.h > index dca5d57b2e3..f7bbd0e952c 100644 > --- a/fixincludes/system.h > +++ b/fixincludes/system.h > @@ -209,6 +209,11 @@ extern int errno; > extern void abort (void); > #endif > > +#if defined (HAVE_DECL_MEMMEM) && !HAVE_DECL_MEMMEM > +extern void *memmem (const void *, size_t, const void *, size_t); > +#endif > + > + > #if HAVE_SYS_STAT_H > # include <sys/stat.h> > #endif Yes, I'm testing it in a container environment where I've removed memmem from system string.h.
