linux-kernel - [PATCH 2/4] kbuild: remove cc-option test of -fno-merge-all-constants

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Message-Id: <20200910135120.3527468-2-masahiroy@kernel.org>
Date:   Thu, 10 Sep 2020 22:51:18 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Ingo Molnar <mingo@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] kbuild: remove cc-option test of -fno-merge-all-constants

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@...nel.org>
---

 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