Bug 718876 – dev-libs/protobuf calls cc directly

• Product: Gentoo Linux
• Status: RESOLVED FIXED

[Description Agostino Sarubbo 2020-04-22 15:53:21 UTC]

This is an auto-filled bug because dev-libs/protobuf calls cc directly.
The issue was originally discovered on x86, but it may be reproducible on other arches as well.
Attached build log and emerge --info.

NOTE:
To reproduce this issue you may want to temporarily move the /usr/bin/cc - /usr/bin/gcc binaries.

[Comment 1 Agostino Sarubbo 2020-04-22 15:53:27 UTC]

Created attachment 634092 [details]
build.log

build log and emerge --info

[Comment 2 Arfrever Frehtes Taifersar Arahesis 2020-04-22 20:12:08 UTC]

AC_PROG_CC and AC_PROG_CXX use ${CC} and ${CXX}, but AX_PROG_CC_FOR_BUILD (alias: AC_PROG_CC_FOR_BUILD) and AX_PROG_CXX_FOR_BUILD (alias: AC_PROG_CXX_FOR_BUILD) use ${CC_FOR_BUILD} and ${CXX_FOR_BUILD} (and ${CPP_FOR_BUILD}, ${CXXCPP_FOR_BUILD}, ${CPPFLAGS_FOR_BUILD}, ${CXXCPPFLAGS_FOR_BUILD}, ${CFLAGS_FOR_BUILD}, ${CXXFLAGS_FOR_BUILD}, ${LDFLAGS_FOR_BUILD}).

https://github.com/protocolbuffers/protobuf/blob/c74057267d64d0b5b8a48feeab2d5b015590aca0/configure.ac#L76-L78

https://www.gnu.org/software/autoconf-archive/ax_prog_cc_for_build.html
https://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob;f=m4/ax_prog_cc_for_build.m4
https://www.gnu.org/software/autoconf-archive/ax_prog_cxx_for_build.html
https://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob;f=m4/ax_prog_cxx_for_build.m4

[Comment 3 Arfrever Frehtes Taifersar Arahesis 2020-04-22 22:54:49 UTC]

https://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=commit;h=9c26407efb0322dda2c08fada6a67dde1c690e74 added automatic detection of compiler based on --build=${CBUILD}.
This works for native ABI, but not for non-native ABI:
(On multilib x86_64 system)
・　`configure --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu` finds `x86_64-pc-linux-gnu-gcc`.
・　`CC="x86_64-pc-linux-gnu-gcc -m32" configure --build=i686-pc-linux-gnu --host=i686-pc-linux-gnu` searches for non-existent `i686-pc-linux-gnu-gcc` and fails, instead of searching for `x86_64-pc-linux-gnu-gcc -m32`.

[Comment 4 Arfrever Frehtes Taifersar Arahesis 2020-04-23 05:26:25 UTC]

*_FOR_BUILD variables are no longer used by build system in >=dev-libs/protobuf-3.6.1:
https://github.com/protocolbuffers/protobuf/issues/7413

[Comment 5 Larry the Git Cow 2020-06-13 18:59:36 UTC]

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

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=60b7072a739ba280d075d6d91da644cd6f3ee372

commit 60b7072a739ba280d075d6d91da644cd6f3ee372
Author:     Arfrever Frehtes Taifersar Arahesis <[e-mail]>
AuthorDate: 2020-06-13 18:26:41 +0000
Commit:     Mike Gilbert <[e-mail]>
CommitDate: 2020-06-13 18:59:13 +0000

    dev-libs/protobuf: Use not AC_PROG_CXX_FOR_BUILD.
    
    Closes: https://bugs.gentoo.org/718876
    Signed-off-by: Arfrever Frehtes Taifersar Arahesis <[e-mail]>
    Signed-off-by: Mike Gilbert <[e-mail]>

 dev-libs/protobuf/protobuf-3.10.1.ebuild | 4 ++++
 dev-libs/protobuf/protobuf-3.11.4.ebuild | 4 ++++
 2 files changed, 8 insertions(+)