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meson.eclass: support incremental LTO for GCC

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Support -flto-incremental=/path/to/cache being used with GCC. Personally,
I am using this hook in /etc/portage/bashrc:
```
pre_src_configure() {
        if [[ -n ${PORTAGE_LTO_CACHE} ]] ; then
                local lto_path=/var/tmp/portage/lto/${CATEGORY}/${PN}
                mkdir -p "${lto_path}"
                export CFLAGS="${CFLAGS} -flto-incremental=${lto_path} -flto-compression-level=19"
                export CXXFLAGS="${CXXFLAGS} -flto-incremental=${lto_path} -flto-compression-level=19"
                export LDFLAGS="${LDFLAGS} -flto-incremental=${lto_path} -flto-compression-level=19"
        fi
}
```

... and then `PORTAGE_LTO_CACHE=1` in my development environment.

Signed-off-by: Sam James <sam@gentoo.org>
This commit is contained in:
Sam James 2025-11-10 04:04:50 +00:00
parent 4b8f97f30f
commit a4eae64aa2
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1 changed files with 13 additions and 1 deletions
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14
eclass/meson.eclass
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@ -1,4 +1,4 @@
# Copyright 2017-2024 Gentoo Authors
# Copyright 2017-2025 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
# @ECLASS: meson.eclass
@ -305,6 +305,18 @@ setup_meson_src_configure() {
MESONARGS+=( -Db_lto_threads=${v} )
;;
esac
if has_version -b ">=dev-build/meson-1.10.0" ; then
local v=$(get-flag -flto-incremental=)
v=${v#-flto-incremental=}
if [[ ${v} ]] ; then
MESONARGS+=(
-Db_thinlto_cache=true
-Db_thinlto_cache_dir=${v}
)
fi
fi
# finally, remove it from *FLAGS to avoid passing it:
# - twice, with potentially different values
# - on excluded targets