GNU bug report logs - #36882
QEMU 4 fails to build for x86_64-linux

Previous Next

Full log

View this message in rfc822 format

From: Ludovic Courtès <ludo <at> gnu.org>
To: Mathieu Othacehe <m.othacehe <at> gmail.com>
Cc: 36882 <at> debbugs.gnu.org, Marius Bakke <mbakke <at> fastmail.com>
Subject: bug#36882: Qemu 4.2.0 build for x86_64-linux fails
Date: Mon, 24 Feb 2020 15:25:20 +0100

Hi,

Mathieu Othacehe <m.othacehe <at> gmail.com> skribis:

>> So is it expected that C_INCLUDE_PATH comes before the hard-coded GCC
>> include directory?  How can we work around that?
>
> Turns out, the best source of documentation here is
> gcc/incpath.c. Here's a summary of my understanding.
>
> Header search list:
>
> * QUOTE
>  -> -iquote 
> * BRACKET
>  -> -I goes here
>  -> CPATH goes here
> * SYSTEM
>  -> -isystem goes here
>  -> C_INCLUDE_PATH goes here
>  -> Hardcoded includes (gcc + glibc) goes here
> * AFTER
> -> -idirafter goes here.
>
> Duplicates inside SYSTEM are deleted, the first occurence is kept. So as
> long as we have glibc in C_INCLUDE_PATH it will trigger deletion of
> glibc in hardcoded includes and AFTER section.
>
> So I can see only two solutions here.
>
> 1. Go back to using CPATH (sad!), because when there is duplication
> between BRACKET and SYSTEM, the include from SYSTEM is kept (why it
> works on master).
>
> 2. Find a way to remove glibc from C_INCLUDE_PATH, but I have no clue
> how to do this properly. Maybe using some kind of filter on
> search-path-specifications.

I’d rather go for #2.  To do that, we could modify the ‘set-paths’ phase
to manually remove glibc from C_INCLUDE_PATH (fragile), or we could
modify GCC (perhaps removing the ‘remove_duplicates’ call for SYSTEM).

Either way, this wouldn’t work well with ‘guix environment’, where glibc
ends up in /gnu/store/…-profile, so it does not appear as duplicate to
GCC.

On ‘core-updates’, I see:

--8<---------------cut here---------------start------------->8---
$ git log | head -3
commit 5afcb5caa53615c0a432e0c1781155398d747218
Author: Ludovic Courtès <ludo <at> gnu.org>
Date:   Sat Feb 22 21:39:27 2020 +0100
$ ./pre-inst-env guix environment -C -e '(@@ (gnu packages commencement) coreutils-final)'
[env]$ gcc -v -x c -E /dev/null
Using built-in specs.
COLLECT_GCC=gcc
Target: x86_64-unknown-linux-gnu
Configured with: 
Thread model: posix
gcc version 7.5.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-E' '-mtune=generic' '-march=x86-64'
 /gnu/store/0pjrnr8vhp94ykvarysd9wg7hcvfqkl5-gcc-7.5.0/libexec/gcc/x86_64-unknown-linux-gnu/7.5.0/cc1 -E -quiet -v /dev/null -mtune=generic -march=x86-64
ignoring duplicate directory "/gnu/store/k9l4v4530p1a69j8qs0aijbmn8lwak20-profile/include"
ignoring nonexistent directory "/no-gcc-local-prefix/include"
ignoring nonexistent directory "/gnu/store/adrw71v03nawqwyblxc0mdhcc41j5vnn-gcc-7.5.0-lib/lib/gcc/x86_64-unknown-linux-gnu/7.5.0/../../../../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /gnu/store/k9l4v4530p1a69j8qs0aijbmn8lwak20-profile/include
 /gnu/store/adrw71v03nawqwyblxc0mdhcc41j5vnn-gcc-7.5.0-lib/lib/gcc/x86_64-unknown-linux-gnu/7.5.0/include
 /gnu/store/adrw71v03nawqwyblxc0mdhcc41j5vnn-gcc-7.5.0-lib/lib/gcc/x86_64-unknown-linux-gnu/7.5.0/include-fixed
 /gnu/store/ccjj5wg0qkjs1zfjr98nhb8cpr434izw-glibc-2.31/include
End of search list.
# 1 "/dev/null"
# 1 "<built-in>"
# 1 "<command-line>"
# 31 "<command-line>"
# 1 "/gnu/store/k9l4v4530p1a69j8qs0aijbmn8lwak20-profile/include/stdc-predef.h" 1 3
# 32 "<command-line>" 2
# 1 "/dev/null"
COMPILER_PATH=/gnu/store/0pjrnr8vhp94ykvarysd9wg7hcvfqkl5-gcc-7.5.0/libexec/gcc/x86_64-unknown-linux-gnu/7.5.0/:/gnu/store/0pjrnr8vhp94ykvarysd9wg7hcvfqkl5-gcc-7.5.0/libexec/gcc/x86_64-unknown-linux-gnu/7.5.0/:/gnu/store/0pjrnr8vhp94ykvarysd9wg7hcvfqkl5-gcc-7.5.0/libexec/gcc/x86_64-unknown-linux-gnu/:/gnu/store/adrw71v03nawqwyblxc0mdhcc41j5vnn-gcc-7.5.0-lib/lib/gcc/x86_64-unknown-linux-gnu/7.5.0/:/gnu/store/adrw71v03nawqwyblxc0mdhcc41j5vnn-gcc-7.5.0-lib/lib/gcc/x86_64-unknown-linux-gnu/
LIBRARY_PATH=/gnu/store/k9l4v4530p1a69j8qs0aijbmn8lwak20-profile/lib/:/gnu/store/k9l4v4530p1a69j8qs0aijbmn8lwak20-profile/lib/:/gnu/store/adrw71v03nawqwyblxc0mdhcc41j5vnn-gcc-7.5.0-lib/lib/gcc/x86_64-unknown-linux-gnu/7.5.0/:/gnu/store/adrw71v03nawqwyblxc0mdhcc41j5vnn-gcc-7.5.0-lib/lib/gcc/x86_64-unknown-linux-gnu/7.5.0/../../../:/gnu/store/ccjj5wg0qkjs1zfjr98nhb8cpr434izw-glibc-2.31/lib
COLLECT_GCC_OPTIONS='-v' '-E' '-mtune=generic' '-march=x86-64'
--8<---------------cut here---------------end--------------->8---

Looking at ‘cppdefault.c’ in GCC, I don’t see where glibc-2.31/include
comes from; it seems that ‘INCLUDE_DEFAULTS’ is undefined on glibc
systems.

Thoughts?

Incidentally, do we have problems building anything other than QEMU?

Thanks,
Ludo’.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.