From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mathieu Othacehe <m.othacehe@gmail.com>
Subject: bug#36882: Qemu 4.2.0 build for x86_64-linux fails
Date: Tue, 25 Feb 2020 15:34:48 +0100
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: 36882@debbugs.gnu.org


Hey!

> I=E2=80=99d rather go for #2.  To do that, we could modify the =E2=80=98s=
et-paths=E2=80=99 phase
> to manually remove glibc from C_INCLUDE_PATH (fragile), or we could
> modify GCC (perhaps removing the =E2=80=98remove_duplicates=E2=80=99 call=
 for SYSTEM).
>
> Either way, this wouldn=E2=80=99t work well with =E2=80=98guix environmen=
t=E2=80=99, where glibc
> ends up in /gnu/store/=E2=80=A6-profile, so it does not appear as duplica=
te to
> GCC.

[...]

> Looking at =E2=80=98cppdefault.c=E2=80=99 in GCC, I don=E2=80=99t see whe=
re glibc-2.31/include
> comes from; it seems that =E2=80=98INCLUDE_DEFAULTS=E2=80=99 is undefined=
 on glibc
> systems.

It's indeed undefined and glibc comes from NATIVE_SYSTEM_HEADER_DIR at
the end of the file you mentioned. It is a consequence of passing
--with-native-system-header-dir=3Dglibc in (gnu packages gcc).

About the environment issue, we have the same problem on master. You can
run the following command:


>
> Thoughts?
>
> Incidentally, do we have problems building anything other than QEMU?
>
> Thanks,
> Ludo=E2=80=99.