25 lines
675 B
Diff
25 lines
675 B
Diff
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--- a/Makefile
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+++ b/Makefile
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@@ -538,9 +538,9 @@ endif # $(dot-config)
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all: vmlinux
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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
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-KBUILD_CFLAGS += -Os
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+KBUILD_CFLAGS += -Os -fno-caller-saves
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else
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-KBUILD_CFLAGS += -O2
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+KBUILD_CFLAGS += -O2 -fno-reorder-blocks -fno-tree-ch -fno-caller-saves
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endif
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include $(srctree)/arch/$(SRCARCH)/Makefile
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@@ -595,6 +595,9 @@ endif
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NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
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CHECKFLAGS += $(NOSTDINC_FLAGS)
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+# improve gcc optimization
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+CFLAGS += $(call cc-option,-funit-at-a-time,)
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+
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# warn about C99 declaration after statement
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KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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