From 7fbfb2050f24a457a909ea6bcec85c49a21db83a Mon Sep 17 00:00:00 2001 From: Bernhard Reutner-Fischer Date: Sun, 24 Apr 2022 18:36:10 +0200 Subject: 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 --- Makefile.flags | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/Makefile.flags b/Makefile.flags index c34356230..84cb00a75 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) -- cgit v1.2.3-55-g6feb