[Bug bootstrap/78616] [7 regression] bootstrap fails for x86_64-darwin at stage1 after 243030 when the bootstrap compiler doesn't have strndup

[iains at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78616

--- Comment #3 from Iain Sandoe <iains at gcc dot gnu.org> ---
trying this (after regnerating gcc/configure and gcc/config.in)

$ git diff gcc/configure.ac include/libiberty.h 
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 703250f..ece1ffa 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -1306,7 +1306,7 @@ AC_CHECK_DECLS([basename(const char*), strstr(const
char*,const char*)], , ,[
 #include "system.h"])

 gcc_AC_CHECK_DECLS(getenv atol atoll asprintf sbrk abort atof getcwd getwd \
-       madvise stpcpy strnlen strsignal strverscmp \
+       madvise stpcpy strnlen strndup strsignal strverscmp \
        strtol strtoul strtoll strtoull setenv unsetenv \
        errno snprintf vsnprintf vasprintf malloc realloc calloc \
        free getopt clock getpagesize ffs gcc_UNLOCKED_FUNCS, , ,[
diff --git a/include/libiberty.h b/include/libiberty.h
index 605ff56..0401dac 100644
--- a/include/libiberty.h
+++ b/include/libiberty.h
@@ -670,6 +670,10 @@ extern int vsnprintf (char *, size_t, const char *,
va_list) ATTRIBUTE_PRINTF(3,
 extern size_t strnlen (const char *, size_t);
 #endif

+#if defined (HAVE_DECL_STRNDUP) && !HAVE_DECL_STRNDUP
+extern size_t strndup (const char *, size_t);
+#endif
+
 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 /* Compare version strings.  */
 extern int strverscmp (const char *, const char *);