From: Nathan Chancellor <nathan@kernel.org>
To: masahiroy@kernel.org, ndesaulniers@google.com
Cc: kernel test robot <lkp@intel.com>,
linux-kbuild@vger.kernel.org, trix@redhat.com,
llvm@lists.linux.dev, npiggin@gmail.com,
Nathan Chancellor <nathan@kernel.org>,
linuxppc-dev@lists.ozlabs.org, nicolas@fjasle.eu
Subject: [PATCH 08/14] powerpc/vdso: Remove an unsupported flag from vgettimeofday-32.o with clang
Date: Wed, 04 Jan 2023 12:54:25 -0700 [thread overview]
Message-ID: <20221228-drop-qunused-arguments-v1-8-658cbc8fc592@kernel.org> (raw)
In-Reply-To: <20221228-drop-qunused-arguments-v1-0-658cbc8fc592@kernel.org>
When clang's -Qunused-arguments is dropped from KBUILD_CPPFLAGS, it
warns:
clang-16: error: argument unused during compilation: '-fno-stack-clash-protection' [-Werror,-Wunused-command-line-argument]
This flag is supported for 64-bit powerpc but not 32-bit, hence the warning.
Just remove the flag from vgettimeofday-32.o's CFLAGS when using clang, as has
been done for other flags previously.
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
Cc: mpe@ellerman.id.au
Cc: npiggin@gmail.com
Cc: christophe.leroy@csgroup.eu
Cc: linuxppc-dev@lists.ozlabs.org
---
arch/powerpc/kernel/vdso/Makefile | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile
index 769b62832b38..4ee7d36ce752 100644
--- a/arch/powerpc/kernel/vdso/Makefile
+++ b/arch/powerpc/kernel/vdso/Makefile
@@ -16,6 +16,11 @@ ifneq ($(c-gettimeofday-y),)
CFLAGS_vgettimeofday-32.o += -ffreestanding -fasynchronous-unwind-tables
CFLAGS_REMOVE_vgettimeofday-32.o = $(CC_FLAGS_FTRACE)
CFLAGS_REMOVE_vgettimeofday-32.o += -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc
+ # This flag is supported by clang for 64-bit but not 32-bit so it will cause
+ # an unused command line flag warning for this file.
+ ifdef CONFIG_CC_IS_CLANG
+ CFLAGS_REMOVE_vgettimeofday-32.o += -fno-stack-clash-protection
+ endif
CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y)
CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN)
CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector)
--
2.39.0
next prev parent reply other threads:[~2023-01-04 19:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-04 19:54 [PATCH 00/14] Remove clang's -Qunused-arguments from KBUILD_CPPFLAGS Nathan Chancellor
2023-01-04 19:54 ` [PATCH 05/14] powerpc: Remove linker flag from KBUILD_AFLAGS Nathan Chancellor
2023-01-09 21:24 ` Nick Desaulniers
2023-01-04 19:54 ` [PATCH 06/14] powerpc/vdso: Remove unused '-s' flag from ASFLAGS Nathan Chancellor
2023-01-09 21:58 ` Nick Desaulniers
2023-01-09 22:15 ` Nathan Chancellor
2023-01-09 22:21 ` Nick Desaulniers
2023-01-09 22:23 ` Segher Boessenkool
2023-01-09 22:37 ` Nathan Chancellor
2023-01-09 22:47 ` Segher Boessenkool
2023-01-09 23:14 ` Nick Desaulniers
2023-01-10 0:51 ` Nathan Chancellor
2023-01-10 11:45 ` Segher Boessenkool
2023-01-10 15:02 ` Nathan Chancellor
[not found] ` <20230109222337.GM25951__25255.3859770828$1673303520$gmane$org@gate.crashing.org>
2023-01-10 0:22 ` Andreas Schwab
2023-01-10 0:43 ` Segher Boessenkool
2023-01-04 19:54 ` [PATCH 07/14] powerpc/vdso: Improve linker flags Nathan Chancellor
2023-01-09 22:08 ` Nick Desaulniers
2023-01-09 22:15 ` Nathan Chancellor
2023-01-04 19:54 ` Nathan Chancellor [this message]
2023-01-09 22:12 ` [PATCH 08/14] powerpc/vdso: Remove an unsupported flag from vgettimeofday-32.o with clang Nick Desaulniers
2023-01-09 22:38 ` Nathan Chancellor
2023-01-09 23:16 ` Nick Desaulniers
2023-01-05 8:00 ` [PATCH 00/14] Remove clang's -Qunused-arguments from KBUILD_CPPFLAGS Heiko Carstens
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20221228-drop-qunused-arguments-v1-8-658cbc8fc592@kernel.org \
--to=nathan@kernel.org \
--cc=linux-kbuild@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=lkp@intel.com \
--cc=llvm@lists.linux.dev \
--cc=masahiroy@kernel.org \
--cc=ndesaulniers@google.com \
--cc=nicolas@fjasle.eu \
--cc=npiggin@gmail.com \
--cc=trix@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).