[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" <gcc-bugzilla at gcc dot gnu dot org>]

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

--- Comment #4 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Sandoe from comment #3)
> 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
>  

oops pasto on strndup signature; meant char * of course


> +#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 *);