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Re: Gcc builtin functions used by glibc not available on mips
- From: Jakub Jelinek <jakub at redhat dot com>
- To: "H . J . Lu" <hjl at lucon dot org>
- Cc: GNU C Library <libc-alpha at sources dot redhat dot com>, gcc at gcc dot gnu dot org, echristo at redhat dot com
- Date: Thu, 7 Feb 2002 12:00:55 +0100
- Subject: Re: Gcc builtin functions used by glibc not available on mips
- References: <20020206222554.A5621@lucon.org>
- Reply-to: Jakub Jelinek <jakub at redhat dot com>
On Wed, Feb 06, 2002 at 10:25:54PM -0800, H . J . Lu wrote:
> In glibc, there are codes
> /* Partly clean the `bootstrap_map' structure up. Don't use
> `memset' since it might not be built in or inlined and we cannot
> make function calls at this point. Use '__builtin_memset' if we
> know it is available. */
> #if __GNUC_PREREQ (2, 96)
> __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info));
> for (cnt = 0;
> cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info);
> bootstrap_map.l_info[cnt] = 0;
> used in ld.so bootstrap. The problem is even gcc 3.1 doesn't have a
> real __builtin_memset for mips. I am very reluctant to call it a gcc
> bug. Maybe we should check it during the gcc configure instead of
> depending on "#if __GNUC_PREREQ (2, 96)".
Well, I think on most arches this __builtin_memset will actually expand to
real memset, since sizeof (bootstrap_map.l_info) is more than 64 * sizeof (void *),
ie. really big. Guess just ia-32 will expand it inline.
But, memset is local symbol in ld.so, do even calls to local functions have
to go through plt or got on mips?