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| author | Bernhard Reutner-Fischer | 2022-04-24 18:36:10 +0200 |
|---|---|---|
| committer | Bernhard Reutner-Fischer | 2022-04-24 19:18:57 +0200 |
| commit | 7fbfb2050f24a457a909ea6bcec85c49a21db83a (patch) | |
| tree | c2b7102fe3c434ea28309e1a0ad93e5b9c12bdd9 | |
| parent | 05c366a56095d116f0f8f331f3d494d9580baf33 (diff) | |
| download | busybox-7fbfb2050f24a457a909ea6bcec85c49a21db83a.zip busybox-7fbfb2050f24a457a909ea6bcec85c49a21db83a.tar.gz | |
kbuild: Prefer -Oz over -Os
-Oz Optimize aggressively for size rather than speed.
with gcc-12 so far (i think only https://gcc.gnu.org/PR32803 and 103773 )
"shorter load imm on x86_64":
(add/remove: 0/0 grow/shrink: 4/1670 up/down: 6/-13196) Total: -13190 bytes
text data bss dec hex filename
975753 4227 1816 981796 efb24 busybox_old
962442 4227 1816 968485 ec725 busybox_unstripped
with clang-15:
(add/remove: 394/34 grow/shrink: 161/1856 up/down: 18644/-98946)Total: -80302 bytes
text data bss dec hex filename
1120994 16066 1696 1138756 116044 busybox_old
1040689 16026 1696 1058411 10266b busybox_unstripped
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
| -rw-r--r-- | Makefile.flags | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/Makefile.flags b/Makefile.flags index c343562..84cb00a 100644 --- a/Makefile.flags +++ b/Makefile.flags @@ -87,14 +87,14 @@ endif #CFLAGS += $(call cc-option,-Wconversion,) ifneq ($(CONFIG_DEBUG),y) -CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,)) +CFLAGS += $(call cc-option,-Oz,$(call cc-option,-Os,$(call cc-option,-O2,))) else CFLAGS += $(call cc-option,-g,) #CFLAGS += "-D_FORTIFY_SOURCE=2" ifeq ($(CONFIG_DEBUG_PESSIMIZE),y) CFLAGS += $(call cc-option,-O0,) else -CFLAGS += $(call cc-option,-Os,$(call cc-option,-O2,)) +CFLAGS += $(call cc-option,-Oz,$(call cc-option,-Os,$(call cc-option,-O2,))) endif endif ifeq ($(CONFIG_DEBUG_SANITIZE),y) |