From: Masahiro Yamada <masahiroy@kernel.org>
To: linux-kbuild@vger.kernel.org
Cc: Ingo Molnar <mingo@redhat.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Michal Marek <michal.lkml@markovi.net>,
Nathan Chancellor <natechancellor@gmail.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Stephen Boyd <swboyd@chromium.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>,
clang-built-linux@googlegroups.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 1/4] kbuild: remove cc-option test of -fno-strict-overflow
Date: Thu, 10 Sep 2020 22:51:17 +0900 [thread overview]
Message-ID: <20200910135120.3527468-1-masahiroy@kernel.org> (raw)
The minimal compiler versions, GCC 4.9 and Clang 10 support this flag.
Here is the godbolt:
https://godbolt.org/z/odq8h9
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
Makefile | 2 +-
arch/arm64/kernel/vdso32/Makefile | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index 4b5a305e30d2..059b36f2ea53 100644
--- a/Makefile
+++ b/Makefile
@@ -922,7 +922,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
# disable invalid "can't wrap" optimizations for signed / pointers
-KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
+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
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index d6adb4677c25..dfffd55175a3 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -90,7 +90,7 @@ VDSO_CFLAGS += -O2
# Some useful compiler-dependent flags from top-level Makefile
VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,)
VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign)
-VDSO_CFLAGS += $(call cc32-option,-fno-strict-overflow)
+VDSO_CFLAGS += -fno-strict-overflow
VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
VDSO_CFLAGS += $(call cc32-option,-Werror=date-time)
VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types)
--
2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Masahiro Yamada <masahiroy@kernel.org>
To: linux-kbuild@vger.kernel.org
Cc: Michal Marek <michal.lkml@markovi.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>,
clang-built-linux@googlegroups.com,
Ingo Molnar <mingo@redhat.com>,
Nathan Chancellor <natechancellor@gmail.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/4] kbuild: remove cc-option test of -fno-strict-overflow
Date: Thu, 10 Sep 2020 22:51:17 +0900 [thread overview]
Message-ID: <20200910135120.3527468-1-masahiroy@kernel.org> (raw)
The minimal compiler versions, GCC 4.9 and Clang 10 support this flag.
Here is the godbolt:
https://godbolt.org/z/odq8h9
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---
Makefile | 2 +-
arch/arm64/kernel/vdso32/Makefile | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index 4b5a305e30d2..059b36f2ea53 100644
--- a/Makefile
+++ b/Makefile
@@ -922,7 +922,7 @@ KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
# disable invalid "can't wrap" optimizations for signed / pointers
-KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
+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
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile
index d6adb4677c25..dfffd55175a3 100644
--- a/arch/arm64/kernel/vdso32/Makefile
+++ b/arch/arm64/kernel/vdso32/Makefile
@@ -90,7 +90,7 @@ VDSO_CFLAGS += -O2
# Some useful compiler-dependent flags from top-level Makefile
VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,)
VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign)
-VDSO_CFLAGS += $(call cc32-option,-fno-strict-overflow)
+VDSO_CFLAGS += -fno-strict-overflow
VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes)
VDSO_CFLAGS += $(call cc32-option,-Werror=date-time)
VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types)
--
2.25.1
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next reply other threads:[~2020-09-10 14:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-10 13:51 Masahiro Yamada [this message]
2020-09-10 13:51 ` [PATCH 1/4] kbuild: remove cc-option test of -fno-strict-overflow Masahiro Yamada
2020-09-10 13:51 ` [PATCH 2/4] kbuild: remove cc-option test of -fno-merge-all-constants Masahiro Yamada
2020-09-10 16:33 ` Nathan Chancellor
2020-09-10 16:41 ` Masahiro Yamada
2020-09-10 13:51 ` [PATCH 3/4] kbuild: remove cc-option test of -fno-stack-check Masahiro Yamada
2020-09-10 16:37 ` Nathan Chancellor
2020-09-10 13:51 ` [PATCH 4/4] kbuild: remove cc-option test of -Werror=date-time Masahiro Yamada
2020-09-10 13:51 ` Masahiro Yamada
2020-09-10 16:43 ` Nathan Chancellor
2020-09-10 16:43 ` Nathan Chancellor
2020-09-10 16:26 ` [PATCH 1/4] kbuild: remove cc-option test of -fno-strict-overflow Nathan Chancellor
2020-09-10 16:26 ` Nathan Chancellor
2020-09-11 15:22 ` Will Deacon
2020-09-11 15:22 ` Will Deacon
2020-09-14 12:51 ` Masahiro Yamada
2020-09-14 12:51 ` Masahiro Yamada
2020-09-14 13:20 ` Will Deacon
2020-09-14 13:20 ` Will Deacon
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