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config/functions: don't enable LTO by default

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Packages are only built with LTO if it's explicitly enabled via
the lto build flag or if a package enables LTO via configure / cmake
options.

Enabling LTO via configure / cmake is the preferred way as this
gives packages more fine grained control, eg enable parallel LTO
linking etc. When doing this packages should respect the
LTO_SUPPORT setting so LTO can be disabled globally.

To avoid conflicting C/CXX/LDFLAGS no FLAGS are added when the
lto build flag is not set.

Signed-off-by: Matthias Reichl <hias@horus.com>
This commit is contained in:
Matthias Reichl 2018-05-29 21:50:46 +02:00
parent e1f18bd4f5
commit 7608095b4e
1 changed files with 1 additions and 6 deletions
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7
config/functions
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@ -1,13 +1,8 @@
setup_toolchain() {
# lto flag
if flag_enabled "lto" "$LTO_SUPPORT" "only-disable"; then
if [ "$LTO_SUPPORT" = "yes" ] && flag_enabled "lto" "no"; then
TARGET_CFLAGS+=" $CFLAGS_OPTIM_LTO"
TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_LTO"
TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO"
else
TARGET_CFLAGS+=" $CFLAGS_OPTIM_NOLTO"
TARGET_CXXFLAGS+=" $CXXFLAGS_OPTIM_NOLTO"
TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_NOLTO"
fi
# gold flag