The minimal compiler versions, GCC 4.9 and Clang 10 support this flag. Here is the godbolt: https://godbolt.org/z/8T4177 Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> --- Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 059b36f2ea53..1b6abecc5cab 100644 --- a/Makefile +++ b/Makefile @@ -927,7 +927,7 @@ KBUILD_CFLAGS += -fno-strict-overflow # clang sets -fmerge-all-constants by default as optimization, but this # is non-conforming behavior for C and in fact breaks the kernel, so we # need to disable it here generally. -KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants) +KBUILD_CFLAGS += -fno-merge-all-constants # for gcc -fno-merge-all-constants disables everything, but it is fine # to have actual conforming behavior enabled. -- 2.25.1
