Re: compiler standards (and/or min gcc version) supported withinstalled headers ?

[Andrew Pinski <pinskia at gmail dot com>]

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.

Thanks,
Andrew