Bug 608990 – sys-devel/gcc add USE for libquad installation instead of hiding behind USE=fortran (was: sci-libs/fftw[quad]: missing dependency for libquadmath)

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Fredric Johansson 2017-02-11 19:11:33 UTC]

sci-libs/fftw have USE=quad but fails to check that libquadmath is installed by gcc causing error during configure

[Comment 1 Justin Lecher (RETIRED) 2017-02-12 19:19:04 UTC]

Could you please add a build.log and the output of "emerge --info gcc"?

[Comment 2 Christoph Junghans (RETIRED) 2017-02-12 19:35:48 UTC]

Looking at toolchain.eclass:
    # newer gcc's come with libquadmath, but only fortran uses
    # it, so auto punt it when we don't care
    if tc_version_is_at_least 4.6 && ! is_fortran ; then
        confgcc+=( --disable-libquadmath )
    fi
so I guess fftw[quad] depends on gcc[fortran], even though the above comment is actually wrong, there are packages using quad without fortran.

[Comment 3 Justin Lecher (RETIRED) 2017-02-12 19:56:42 UTC]

Thanks Chrostoph digging this out

[Comment 4 Larry the Git Cow 2018-09-01 22:23:55 UTC]

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=461721fc58ad27051c1a3108f62a0e431288160e

commit 461721fc58ad27051c1a3108f62a0e431288160e
Author:     Conrad Kostecki <[e-mail]>
AuthorDate: 2018-09-01 13:49:27 +0000
Commit:     Andrew Savchenko <[e-mail]>
CommitDate: 2018-09-01 22:23:44 +0000

    sci-libs/fftw: bump to version 3.3.8
    
    Closes: https://bugs.gentoo.org/651028
    Closes: https://bugs.gentoo.org/608990
    Package-Manager: Portage-2.3.48, Repoman-2.3.10

 sci-libs/fftw/Manifest          |   1 +
 sci-libs/fftw/fftw-3.3.8.ebuild | 181 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 182 insertions(+)

[Comment 5 Arfrever Frehtes Taifersar Arahesis 2018-09-01 22:28:35 UTC]

I think that GCC maintainer will still be interested in fixing this properly in GCC (toolchain.eclass).

Either a new USE flag should be added to GCC, or libquadmath should be installed unconditionally.

[Comment 6 Sergei Trofimovich (RETIRED) 2018-09-01 22:57:08 UTC]

Yeah. I think unconditional libquadmath install should be fine.

[Comment 7 Rolf Eike Beer 2020-07-25 08:06:57 UTC]

Created attachment 650674 [details]
build.log of 3.3.8-r1 on sparc

The problem is still there with 3.3.8-r1

[Comment 8 Rolf Eike Beer 2020-07-25 08:09:55 UTC]

Created attachment 650676 [details]
config.logs

[Comment 9 John Helmert III 2020-07-30 01:42:15 UTC]

Still getting the same with gcc-9.3.0-r1[fortran] and fftw-3.3.8-r1 on arm

[Comment 10 Sergei Trofimovich (RETIRED) 2020-07-30 06:39:40 UTC]

(In reply to John Helmert III (ajak) from comment #9)
> Still getting the same with gcc-9.3.0-r1[fortran] and fftw-3.3.8-r1 on arm

Please file a separate bug. This bug is about missing support library in gcc.

[Comment 11 Larry the Git Cow 2020-07-30 06:54:58 UTC]

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=a06e1246568c3c6043de3ae6a5042e5470be1fa8

commit a06e1246568c3c6043de3ae6a5042e5470be1fa8
Author:     Sergei Trofimovich <[e-mail]>
AuthorDate: 2020-07-30 06:51:44 +0000
Commit:     Sergei Trofimovich <[e-mail]>
CommitDate: 2020-07-30 06:54:52 +0000

    toolchain.eclass: install libquadmath by default
    
    libquadmath is a small support runtime library for _Float128
    types. sci-libs/fftw happens to use it and expects it to be
    provided by gcc. Let's provide it unconditionally.
    
    Reported-by: Fredric Johansson
    Closes: https://bugs.gentoo.org/608990
    Signed-off-by: Sergei Trofimovich <[e-mail]>

 eclass/toolchain.eclass | 6 ------
 1 file changed, 6 deletions(-)

[Comment 12 Andrew Aladjev 2020-07-30 19:40:13 UTC]

Please do not fix in that way, libquadmath cross compilation is broken.