compiler standards (and/or min gcc version) supported with installed headers ?

[Mike Frysinger]

On Saturday 29 December 2012 16:48:13 Rich Felker wrote:
> On Sat, Dec 29, 2012 at 01:24:56PM -0800, Andrew Pinski wrote:
> > On Sat, Dec 29, 2012 at 12:58 PM, Mike Frysinger <vapier@gentoo.org> 
wrote:
> > > On Saturday 29 December 2012 15:44:49 Andreas Schwab wrote:
> > >> Mike Frysinger writes:
> > >> > On Saturday 29 December 2012 01:26:56 Andrew Pinski wrote:
> > >> >> On Fri, Dec 28, 2012 at 10:01 PM, Mike Frysinger wrote:
> > >> >> > there are also attributes unconditionally used such as:
> > >> >> >         stdlib.h: malloc (new to gcc-3.0)
> > >> >> >         mathcalls.h: nonnull (new to gcc-3.3)
> > >> >> >         stdlib.h: alloc_size (new to gcc-4.3)
> > >> >> 
> > >> >> unknown attributes are normally ignored even with -W -Wall (though
> > >> >> not with -Wattributes) so those should be ok.
> > >> > 
> > >> > yes, but it makes -Werror and such angry,
> > >> 
> > >> Only with -Wsystem-headers.
> > > 
> > > if your gcc supports that, yes :).  that flag is new to gcc-3.0.
> > > 
> > > it's probably not as much of an issue for glibc headers, but that flag
> > > doesn't work in cases with -I paths that are subdirs of /usr/include. 
> > > for example, with glib-2.0, you get:
> > > $ pkg-config glib-2.0 --cflags
> > > -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include
> > > 
> > > so when you do "#include <glib/garray.h>", that isn't considered a
> > > system header because it was found via the -I :(.
> > 
> > pkg-config should be using -isystem instead.
> 
> Why? glib headers are not system headers. They're third-party library
> headers. Why was glib even brought into this discussion about glibc
> header behavior? As far as I can tell it's irrelevant.

did you even read my e-mail ?  if you did, the answer would be fairly obvious.
-mike
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