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Merge pull request #9365 from antonlacon/le13-lto2

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build: update lto related PKG_BUILD_FLAGS
This commit is contained in:
Matthias Reichl 2024-10-18 14:38:24 +02:00 committed by GitHub
commit aedc866afb
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3 changed files with 7 additions and 17 deletions
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17
config/functions
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@ -299,25 +299,18 @@ get_target_linker() {
setup_toolchain() {
if [ "$LTO_SUPPORT" = "yes" ]; then
if flag_enabled "lto-parallel" "no"; then
TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO_COMMON $FLAGS_OPTIM_LTO_PARALLEL"
elif flag_enabled "lto-fat" "no"; then
TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_FAT"
TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_FAT"
TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO_COMMON $FLAGS_OPTIM_LTO_NO_PARALLEL"
if flag_enabled "lto-fat" "no"; then
TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO $FLAGS_OPTIM_LTO_FAT"
TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO $FLAGS_OPTIM_LTO_FAT"
elif flag_enabled "lto" "no"; then
TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_NO_PARALLEL $FLAGS_OPTIM_LTO_NO_FAT"
TARGET_LDFLAGS+=" $LDFLAGS_OPTIM_LTO_COMMON $FLAGS_OPTIM_LTO_NO_PARALLEL"
TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO $FLAGS_OPTIM_LTO_NO_FAT"
TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO $FLAGS_OPTIM_LTO_NO_FAT"
fi
fi
if flag_enabled "lto-off" "no"; then
TARGET_CFLAGS+=" $FLAGS_OPTIM_LTO_OFF"
TARGET_CXXFLAGS+=" $FLAGS_OPTIM_LTO_OFF"
TARGET_LDFLAGS+=" $FLAGS_OPTIM_LTO_OFF"
fi
local linker="$(get_target_linker)"

4
config/optimize
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@ -20,12 +20,10 @@ HOST_CFLAGS="$HOST_CFLAGS -Wno-format-security"
HOST_CXXFLAGS="$HOST_CXXFLAGS -Wno-format-security"
# lto flags
FLAGS_OPTIM_LTO_NO_PARALLEL="-flto"
FLAGS_OPTIM_LTO_PARALLEL="-flto=${CONCURRENCY_MAKE_LEVEL}"
FLAGS_OPTIM_LTO="-flto -Werror=odr -Werror=lto-type-mismatch -Werror=strict-aliasing"
FLAGS_OPTIM_LTO_NO_FAT="-fno-fat-lto-objects"
FLAGS_OPTIM_LTO_FAT="-ffat-lto-objects"
FLAGS_OPTIM_LTO_OFF="-fno-lto"
LDFLAGS_OPTIM_LTO_COMMON="-fuse-linker-plugin"
# linker specific flags
LDFLAGS_OPTIM_LINKER_COMPILER_DEFAULT=""

3
packages/readme.md
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@ -122,8 +122,7 @@ Set the variable `PKG_BUILD_FLAGS` in the `package.mk` to enable/disable the sin
| pic:host | disabled | host, bootstrap | see above |
| speed | disabled | target, init | replaces default `-O2` compiler optimization with `-O3` (can only enable; overrules size) |
| size | disabled | target, init | replaces default `-O2` compiler optimization with `-Os` (can only enable) |
| lto | disabled | target, init | enable LTO (Link Time optimization) in the compiler and linker unless disabled via `LTO_SUPPORT`. Compiles non-fat LTO objects (only bytecode) and performs single-threaded optimization at link stage |
| lto-parallel | disabled | target, init | same as `lto` but enables parallel optimization at link stage. Only enable this if the package build doesn't run multiple linkers in parallel otherwise this can result in lots of parallel processes! |
| lto | disabled | target, init | enable LTO (Link Time optimization) in the compiler and linker unless disabled via `LTO_SUPPORT`. Compiles non-fat LTO objects (only bytecode) and automatically determines number of threads to use for optimization at link stage |
| lto-fat | disabled | target, init | same as `lto` but compile fat LTO objects (bytecode plus optimized assembly). This increases compile time but can be useful to create static libraries suitable both for LTO and non-LTO linking |
| lto-off | disabled | target, init | explicitly disable LTO in the compiler and linker |
| bfd | - | target, init | `+bfd` prefers bfd linker over default linker, `-bfd` disables using bfd |