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sys-devel/llvm: Apply -mno-bmi to work-around gcc-7 bug

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Thanks to Alexander Bezrukov for finding the upstream bug and suggesting
a proper workaround.

Closes: https://bugs.gentoo.org/649880
This commit is contained in:
Michał Górny
2018-03-10 21:48:34 +01:00
parent c70d69b692
commit deda94ea9d
3 changed files with 21 additions and 9 deletions
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sys-devel/llvm/llvm-6.0.0.ebuild
+7 -9
View File
@@ -75,15 +75,6 @@ S=${WORKDIR}/${P/_/}.src
# least intrusive of all
CMAKE_BUILD_TYPE=RelWithDebInfo
pkg_pretend() {
if tc-is-gcc && [[ $(gcc-major-version) -ge 7 ]]; then
eerror "GCC 7 is known to cause mis-compilation that causes the build to hang."
eerror "Please use an older version to build LLVM until a good solution is found."
eerror "Bug report: https://bugs.gentoo.org/649880"
die "GCC-7+ is not supported"
fi
}
src_prepare() {
# Fix llvm-config for shared linking and sane flags
# https://bugs.gentoo.org/show_bug.cgi?id=565358
@@ -179,6 +170,13 @@ multilib_src_configure() {
)
fi
# workaround BMI bug in gcc-7 (fixed in 7.4)
# https://bugs.gentoo.org/649880
if tc-is-gcc && [[ $(gcc-major-version) -eq 7 && $(gcc-minor-version) -lt 4 ]]; then
local CFLAGS="${CFLAGS} -mno-bmi"
local CXXFLAGS="${CXXFLAGS} -mno-bmi"
fi
# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
cmake-utils_src_configure
sys-devel/llvm/llvm-6.0.9999.ebuild
+7
View File
@@ -170,6 +170,13 @@ multilib_src_configure() {
)
fi
# workaround BMI bug in gcc-7 (fixed in 7.4)
# https://bugs.gentoo.org/649880
if tc-is-gcc && [[ $(gcc-major-version) -eq 7 && $(gcc-minor-version) -lt 4 ]]; then
local CFLAGS="${CFLAGS} -mno-bmi"
local CXXFLAGS="${CXXFLAGS} -mno-bmi"
fi
# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
cmake-utils_src_configure
sys-devel/llvm/llvm-9999.ebuild
+7
View File
@@ -172,6 +172,13 @@ multilib_src_configure() {
)
fi
# workaround BMI bug in gcc-7 (fixed in 7.4)
# https://bugs.gentoo.org/649880
if tc-is-gcc && [[ $(gcc-major-version) -eq 7 && $(gcc-minor-version) -lt 4 ]]; then
local CFLAGS="${CFLAGS} -mno-bmi"
local CXXFLAGS="${CXXFLAGS} -mno-bmi"
fi
# LLVM_ENABLE_ASSERTIONS=NO does not guarantee this for us, #614844
use debug || local -x CPPFLAGS="${CPPFLAGS} -DNDEBUG"
cmake-utils_src_configure