[gentoo-dev] [PATCH 4/4] distutils-r1.eclass: Disable LTO when using cargo.eclass

["Michał Górny" <mgorny@gentoo.org>]

Strip LTO flags when cargo.eclass is inherited.  This means that Rust
extensions are being built, and linking them with C/C++ style LTO
results in broken shared libraries.

Closes: https://bugs.gentoo.org/910220
Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
 eclass/distutils-r1.eclass | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
index 924e83b54ad8..5f2decaa89a3 100644
--- a/eclass/distutils-r1.eclass
+++ b/eclass/distutils-r1.eclass
@@ -191,6 +191,7 @@ esac
 if [[ -z ${_DISTUTILS_R1_ECLASS} ]]; then
 _DISTUTILS_R1_ECLASS=1
 
+inherit flag-o-matic
 inherit multibuild multilib multiprocessing ninja-utils toolchain-funcs
 
 if [[ ! ${DISTUTILS_SINGLE_IMPL} ]]; then
@@ -1836,6 +1837,12 @@ distutils-r1_run_phase() {
 		local -x CYTHON_FORCE_REGEN=1
 	fi
 
+	# Rust extensions are incompatible with C/C++ LTO compiler
+	# see e.g. https://bugs.gentoo.org/910220
+	if [[ ${_CARGO_ECLASS} ]]; then
+		filter-lto
+	fi
+
 	# How to build Python modules in different worlds...
 	local ldopts
 	case "${CHOST}" in
-- 
2.41.0