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meson.eclass: wire up LTO support directly into the meson options

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meson's builtin LTO support allows meson to introspect whether LTO is
enabled and do some fancy things, such as forcing LTO off for a single
target that is known to be special(ly bad) and not support LTO.

Signed-off-by: Eli Schwartz <eschwartz93@gmail.com>
Signed-off-by: Sam James <sam@gentoo.org>
This commit is contained in:
Eli Schwartz
2024-01-16 00:43:58 -05:00
committed by Sam James
parent e9189344b9
commit 5e7b32c59d
1 changed files with 35 additions and 5 deletions
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40
eclass/meson.eclass
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@@ -41,7 +41,7 @@ esac
if [[ -z ${_MESON_ECLASS} ]]; then
_MESON_ECLASS=1
inherit multiprocessing ninja-utils python-utils-r1 toolchain-funcs
inherit flag-o-matic multiprocessing ninja-utils python-utils-r1 toolchain-funcs
BDEPEND=">=dev-build/meson-1.2.1
${NINJA_DEPEND}
@@ -283,6 +283,38 @@ meson_feature() {
# variables. Invoke via "${MESONARGS[@]}" in the calling environment.
# This function is called from meson_src_configure.
setup_meson_src_configure() {
MESONARGS=()
if tc-is-lto; then
# We want to connect -flto in *FLAGS to the dedicated meson option,
# to ensure that meson has visibility into what the user set. Although
# it is unlikely projects will check `get_option('b_lto')` and change
# their behavior, individual targets which are broken with LTO can
# disable it per target. Injecting via *FLAGS means that meson cannot
# strip -flto from that target.
MESONARGS+=( -Db_lto=true )
# respect -flto value, e.g. -flto=8, -flto=thin
local v=$(get-flag flto)
case ${v} in
thin)
MESONARGS+=( -Db_lto_mode=thin )
;;
''|*[!0-9]*)
;;
*)
MESONARGS+=( -Db_lto_threads=${v} )
;;
esac
# finally, remove it from *FLAGS to avoid passing it:
# - twice, with potentially different values
# - on excluded targets
filter-lto
else
# Prevent projects from enabling LTO by default. In Gentoo, LTO is
# enabled via setting *FLAGS appropriately.
MESONARGS+=( -Db_lto=false )
fi
local BUILD_CFLAGS=${BUILD_CFLAGS}
local BUILD_CPPFLAGS=${BUILD_CPPFLAGS}
local BUILD_CXXFLAGS=${BUILD_CXXFLAGS}
@@ -311,7 +343,7 @@ setup_meson_src_configure() {
: "${BUILD_PKG_CONFIG_PATH:=${PKG_CONFIG_PATH}}"
fi
MESONARGS=(
MESONARGS+=(
--libdir "$(get_libdir)"
--localstatedir "${EPREFIX}/var/lib"
--prefix "${EPREFIX}/usr"
@@ -331,9 +363,7 @@ setup_meson_src_configure() {
# an upstream development matter. bug #754279.
-Dwerror=false
# Prevent projects from enabling LTO by default. In Gentoo, LTO is
# enabled via setting *FLAGS appropriately.
-Db_lto=false
"${ltoflags[@]}"
)
if [[ -n ${EMESON_BUILDTYPE} ]]; then