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| author | Tom Hughes <tomhughes@chromium.org> | 2021-09-30 23:19:40 +0000 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-10-29 22:33:11 +0000 |
| commit | 85839a2c40377397bc5d23d12bc3b86bb9d5e137 (patch) | |
| tree | fa6e13157073b84f27ffae1c2f722ad99006e3e7 | |
| parent | 061ce16de9ad7a57cff270ac82d55c3e0137e544 (diff) | |
| download | chrome-ec-85839a2c40377397bc5d23d12bc3b86bb9d5e137.tar.gz | |
core/cortex-m[0]: Enable "-Oz" when using clang
"-Oz" is like "-Os" (and thus "-O2"), but reduces code size further.
dartmonkey, clang, -Os:
RO: 733500 flash remaining
RW: 979488 flash remaining
dartmonkey, clang, -Oz:
RO: 737980 flash remaining
RW: 984776 flash remaining
BRANCH=none
BUG=b:172020503
TEST=make buildall
TEST=CC=clang make BOARD=dartmonkey
Signed-off-by: Tom Hughes <tomhughes@chromium.org>
Change-Id: Ia787845ffdeff26134162007a621b902bbc0d051
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3199737
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>
| -rw-r--r-- | core/cortex-m/build.mk | 4 | ||||
| -rw-r--r-- | core/cortex-m0/build.mk | 7 |
2 files changed, 8 insertions, 3 deletions
diff --git a/core/cortex-m/build.mk b/core/cortex-m/build.mk index be41a12b9e..23a197af88 100644 --- a/core/cortex-m/build.mk +++ b/core/cortex-m/build.mk @@ -15,11 +15,13 @@ $(call set-option,CROSS_COMPILE,\ CFLAGS_FPU-$(CONFIG_FPU)=-mfpu=fpv4-sp-d16 -mfloat-abi=hard # CPU specific compilation flags -CFLAGS_CPU+=-mthumb -Os +CFLAGS_CPU+=-mthumb ifeq ($(cc-name),clang) +CFLAGS_CPU+=-Oz # Like -Os (and thus -O2), but reduces code size further. # Link compiler-rt when using clang, so clang finds the builtins it provides. LDFLAGS_EXTRA+=-lclang_rt.builtins-arm else +CFLAGS_CPU+=-Os CFLAGS_CPU+=-mno-sched-prolog endif CFLAGS_CPU+=-mno-unaligned-access diff --git a/core/cortex-m0/build.mk b/core/cortex-m0/build.mk index 44093b93ff..40764f53c6 100644 --- a/core/cortex-m0/build.mk +++ b/core/cortex-m0/build.mk @@ -12,8 +12,11 @@ $(call set-option,CROSS_COMPILE,\ /opt/coreboot-sdk/bin/arm-eabi-) # CPU specific compilation flags -CFLAGS_CPU+=-mthumb -Os -ifneq ($(cc-name),clang) +CFLAGS_CPU+=-mthumb +ifeq ($(cc-name),clang) +CFLAGS_CPU+=-Oz # Like -Os (and thus -O2), but reduces code size further. +else +CFLAGS_CPU+=-Os CFLAGS_CPU+=-mno-sched-prolog endif CFLAGS_CPU+=-mno-unaligned-access |