Bug 629880

Summary:	media-sound/mpd-0.20.10 autoconfig check picks up host system's boost include path
Product:	Gentoo/Alt	Reporter:	Matthias Gerstner <mgerstner>
Component:	Prefix Support	Assignee:	Gentoo Prefix <prefix>
Status:	RESOLVED FIXED
Severity:	normal	CC:	hwoarang, sound, tsmksubc
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	suggested patch

Description Matthias Gerstner 2017-09-04 12:59:19 UTC

When building media-sound/mpd on a prefix installation where the host also has boost libraries installed (i.e. headers in /usr/include/boost), the autoconf check (probably the one in `m4/ax_boost_base.m4`) picks up the host's boost include path instead of the one in the prefix.

This leads to an additional include switch passed to the compiler '-I/usr/include' which will cause system headers of the host and the prefix to get mixed up resulting in compile errors.

This bug is related to bug 629876 which causes the same behaviour in media-sound/mpd.

I will attach a suggested patch for mpd which explicitly passed `--with-boost=` to point the autotools to the correct boost header location. This fixed the error for me.

Reproducible: Always

Steps to Reproduce:
1. emerge mpd (on a prefix installation where the host also has boost headers installed)

Actual Results:  
mpd will fail to build, or at least additionally pass '-I/usr/include' to the compiler where it should not

Expected Results:  
mpd should succeed to build, not passing '-I/usr/include' to the compiler.

Also check BOOST_CPPFLAGS in config.log after calling configure for media-sound/mpd.

Comment 1 Matthias Gerstner 2017-09-04 13:04:19 UTC

Created attachment 492254 [details, diff]
suggested patch

explicitly pass boost include path to configure to fix the issue

Comment 2 Fabian Groffen gentoo-dev

2017-09-12 18:48:14 UTC

@maintainers: could you please have a look at Matthias' patch?

Comment 3 Larry the Git Cow gentoo-dev

2017-12-12 17:30:47 UTC

The bug has been closed via the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=2d3ad96a836ec425fda6d6ed3088948165a65456

commit 2d3ad96a836ec425fda6d6ed3088948165a65456
Author:     Matthias Gerstner <matthias.gerstner@suse.de>
AuthorDate: 2017-09-04 12:30:13 +0000
Commit:     Andreas Sturmlechner <asturm@gentoo.org>
CommitDate: 2017-12-12 17:30:28 +0000

    media-sound/mpd: Fix mpd build on prefix profiles
    
    libmad recorded wrong pkgconfig cflags which caused configure in mpd to
    pick up an additional '-I /usr/include' which then broke because of
    mixing up std headers.
    
    Similarly the autoconf check for boost picks up the host system's
    /usr/include instead of the prefix's ${EPREFIX}/usr/include, leading to
    the same result as with libmad in the mpd build.
    
    An explicity --with-boost heals this.
    
    Closes: https://bugs.gentoo.org/629880

 media-sound/mpd/mpd-0.20.12.ebuild | 1 +
 1 file changed, 1 insertion(+)