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Makefile: Remove obsolete -fno-builtin flag

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CAF cherry-picked an obsolete LLVMLinux patch from 2014 in commit
96d47aed062d6b0940aa575d6b5b6cd8ccfdbef9 that introduced this
unnecessary flag. Now that the functions used by Clang's libcall
optimizations have been implemented, we can allow Clang to perform said
optimizations for a minor performance bump in certain code paths.

Signed-off-by: Danny Lin <danny@kdrag0n.dev>
Signed-off-by: azrim <mirzaspc@gmail.com>
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Danny Lin 2020-08-25 22:28:23 -07:00 committed by azrim
parent 51e7ae0568
commit cb40ad914d
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Makefile
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@ -785,7 +785,6 @@ ifeq ($(cc-name),clang)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
KBUILD_CFLAGS += -fno-builtin
KBUILD_CFLAGS += $(call cc-option, -Wno-undefined-optimized)
KBUILD_CFLAGS += $(call cc-option, -Wno-tautological-constant-out-of-range-compare)
KBUILD_CFLAGS += $(call cc-option, -mllvm -disable-struct-const-merge)