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Re: compiler standards (and/or min gcc version) supported withinstalled headers ?
- From: "Joseph S. Myers" <joseph at codesourcery dot com>
- To: Andreas Jaeger <aj at suse dot com>
- Cc: Carlos O'Donell <carlos at systemhalted dot org>, <libc-alpha at sourceware dot org>
- Date: Thu, 3 Jan 2013 15:58:06 +0000
- Subject: Re: compiler standards (and/or min gcc version) supported withinstalled headers ?
- References: <firstname.lastname@example.org> <50E53F6C.email@example.com><50E5989B.firstname.lastname@example.org> <50E59CD8.email@example.com>
On Thu, 3 Jan 2013, Andreas Jaeger wrote:
> > Thus for example we could get rid of the GCC 2.91 check for __builtin_memset
> > in sysdeps/unix/sysv/linux/bits/sched.h and clean that up.
> That raises a separate question - shall we assume that non-GCC compilers have
> __builtin_memset as well?
> Otherwise the cleanup would be to change the got to use
> GLIBC_HAVE_BUILTIN_MEMSET - and define that for GCC.
Defining __GLIBC_HAVE_BUILTIN_MEMSET seems logically right. (You can't
just define __builtin_memset to memset because string.h may not be
included. So you don't really clean much up in this case because you
still have both cases in the code - and given that there's still a GCC
conditional somewhere, there doesn't really seem to be much advantage in
the test being __GNUC__ instead of __GNUC_PREREQ (2, 91).)
Joseph S. Myers