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gcc: Assume '-O2' by default for building gcc target libraries

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The gcc target libraries (e.g. libstdc++) are currently built without
any optimisation flag when `CT_CC_GCC_ENABLE_TARGET_OPTSPACE` is not
enabled and default to `-O0` unless user explicitly specifies an
optimisation flag.

This commit updates the gcc build script to assume `-O2` for building
target libraries unless user provides a different optimisation flag.

Note also that this is the default behaviour for gcc when
C[XX]FLAGS_FOR_TARGET is not overridden.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
This commit is contained in:
Stephanos Ioannidis 2019-11-30 01:42:18 +09:00
parent 6dd60ca694
commit 3c637c1eec
1 changed files with 11 additions and 3 deletions
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14
scripts/build/cc/gcc.sh
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@ -608,6 +608,9 @@ do_gcc_core_backend() {
cflags_for_target="${cflags_for_target} -idirafter ${CT_HEADERS_DIR}"
fi
# Assume '-O2' by default for building target libraries.
cflags_for_target="-g -O2 ${cflags_for_target}"
# Use --with-local-prefix so older gccs don't look in /usr/local (http://gcc.gnu.org/PR10532).
# Pass only user-specified CFLAGS/LDFLAGS in CFLAGS_FOR_TARGET/LDFLAGS_FOR_TARGET: during
# the build of, for example, libatomic, GCC tried to compile multiple variants for runtime
@ -936,6 +939,7 @@ do_gcc_backend() {
local lang_list
local cflags
local cflags_for_build
local cflags_for_target
local ldflags
local build_manuals
local exec_prefix
@ -1200,8 +1204,9 @@ do_gcc_backend() {
CT_DoLog DEBUG "Extra config passed: '${extra_config[*]}'"
# We may need to modify host/build CFLAGS separately below
# We may need to modify host/build/target CFLAGS separately below
cflags_for_build="${cflags}"
cflags_for_target="${CT_TARGET_CFLAGS}"
# Clang's default bracket-depth is 256, and building GCC
# requires somewhere between 257 and 512.
@ -1217,6 +1222,9 @@ do_gcc_backend() {
fi
fi
# Assume '-O2' by default for building target libraries.
cflags_for_target="-g -O2 ${cflags_for_target}"
# NB: not using CT_ALL_TARGET_CFLAGS/CT_ALL_TARGET_LDFLAGS here!
# See do_gcc_core_backend for explanation.
CT_DoExecLog CFG \
@ -1226,8 +1234,8 @@ do_gcc_backend() {
CXXFLAGS="${cflags}" \
CXXFLAGS_FOR_BUILD="${cflags_for_build}" \
LDFLAGS="${final_LDFLAGS[*]}" \
CFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}" \
CXXFLAGS_FOR_TARGET="${CT_TARGET_CFLAGS}" \
CFLAGS_FOR_TARGET="${cflags_for_target}" \
CXXFLAGS_FOR_TARGET="${cflags_for_target}" \
LDFLAGS_FOR_TARGET="${CT_TARGET_LDFLAGS}" \
${CONFIG_SHELL} \
"${CT_SRC_DIR}/gcc/configure" \