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Bug 480732 - media-libs/mesa USE=llvm should depend on sys-devel/llvm[debug=]
Summary: media-libs/mesa USE=llvm should depend on sys-devel/llvm[debug=]
Status: RESOLVED INVALID
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Library (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo X packagers
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Reported: 2013-08-12 14:21 UTC by Alexander Tsoy
Modified: 2013-10-12 12:59 UTC (History)
0 users

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Description Alexander Tsoy 2013-08-12 14:21:47 UTC 
Build system of mesa preserve some C{,PP,XX}FLAGS from llvm installation when building llvm-related code.

vm4249 ~ # grep 'LLVM_C.*FLAGS=' /var/tmp/portage/media-libs/mesa-9.1.2-r1/work/Mesa-9.1.2/configure
        LLVM_CPPFLAGS=`strip_unwanted_llvm_flags "$LLVM_CONFIG --cppflags"`
        LLVM_CFLAGS=$LLVM_CPPFLAGS   # CPPFLAGS seem to be sufficient
        LLVM_CXXFLAGS=`strip_unwanted_llvm_flags "$LLVM_CONFIG --cxxflags"`

IMHO mesa[llvm] should depend on llvm[debug=] for more predictable results. Below are results shown by qsize. All tests done with FEATURES="-nostrip". I suspect that with nostrip the difference would be much greater.

llvm[-debug]
sys-devel/llvm-3.1-r2: 689 files, 36 non-files, 62129.94 KB
 - mesa[-debug]
media-libs/mesa-9.1.2-r1: 56 files, 22 non-files, 141855.921 KB
 - mesa[debug]
media-libs/mesa-9.1.2-r1: 56 files, 22 non-files, 163895.585 KB

llvm[debug] 
sys-devel/llvm-3.1-r2: 689 files, 36 non-files, 105066.587 KB
 - mesa[-debug]
media-libs/mesa-9.1.2-r1: 56 files, 22 non-files, 178648.171 KB
 - mesa[debug]
media-libs/mesa-9.1.2-r1: 56 files, 22 non-files, 203159.835 KB


vm4249 ~ # emerge -qpv media-libs/mesa sys-devel/llvm
[ebuild   R   ] sys-devel/llvm-3.1-r2  USE="libffi -debug -gold -multitarget -ocaml {-test} -udis86 -vim-syntax" 
[ebuild   R   ] media-libs/mesa-9.1.2-r1  USE="classic egl gallium llvm nptl pax_kernel shared-glapi -bindist -debug -gbm -gles1 -gles2 -openvg -osmesa -pic (-r600-llvm-compiler) (-selinux) -vdpau (-wayland) -xa -xorg -xvmc" PYTHON_SINGLE_TARGET="python2_7 -python2_6" PYTHON_TARGETS="python2_7 -python2_6" VIDEO_CARDS="intel nouveau radeon vmware -i915 -i965 -r100 -r200 -r300 -r600 (-radeonsi)"
Comment 1 Michał Górny archtester Gentoo Infrastructure gentoo-dev Security 2013-10-12 12:59:34 UTC 
USE=debug is not really intended to control USE flags, esp. in llvm. To be honest, I'm considering masking it since it has very high build requirements and the resulting LLVM is mostly broken.