linux-kernel - [PATCH] kbuild: add most of Clang-specific flags unconditionally

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Message-Id: <20190509064455.1173-1-yamada.masahiro@socionext.com>
Date:   Thu,  9 May 2019 15:44:55 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-kbuild@...r.kernel.org
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        clang-built-linux@...glegroups.com,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] kbuild: add most of Clang-specific flags unconditionally

We do not support old Clang versions. Upgrade your clang version
if any of these flags is unsupported.

Let's add flags within ifdef CONFIG_CC_IS_CLANG unconditionally,
except -fcatch-undefined-behavior.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 Makefile                   | 10 +++++-----
 scripts/Makefile.extrawarn | 12 ++++++------
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/Makefile b/Makefile
index bd7ae11947cb..c71ffb6f55b5 100644
--- a/Makefile
+++ b/Makefile
@@ -731,15 +731,15 @@ stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
 KBUILD_CFLAGS += $(stackp-flags-y)
 
 ifdef CONFIG_CC_IS_CLANG
-KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
-KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
-KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
+KBUILD_CPPFLAGS += -Qunused-arguments
+KBUILD_CFLAGS += -Wno-format-invalid-specifier
+KBUILD_CFLAGS += -Wno-gnu
 # Quiet clang warning: comparison of unsigned expression < 0 is always false
-KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
+KBUILD_CFLAGS += -Wno-tautological-compare
 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
 # See modpost pattern 2
-KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
+KBUILD_CFLAGS += -mno-global-merge
 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
 else
 
diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 768306add591..523c4cafe2dc 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -66,11 +66,11 @@ KBUILD_CFLAGS += $(warning)
 else
 
 ifdef CONFIG_CC_IS_CLANG
-KBUILD_CFLAGS += $(call cc-disable-warning, initializer-overrides)
-KBUILD_CFLAGS += $(call cc-disable-warning, unused-value)
-KBUILD_CFLAGS += $(call cc-disable-warning, format)
-KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare)
-KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length)
-KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized)
+KBUILD_CFLAGS += -Wno-initializer-overrides
+KBUILD_CFLAGS += -Wno-unused-value
+KBUILD_CFLAGS += -Wno-format
+KBUILD_CFLAGS += -Wno-sign-compare
+KBUILD_CFLAGS += -Wno-format-zero-length
+KBUILD_CFLAGS += -Wno-uninitialized
 endif
 endif
-- 
2.17.1