From: Tiezhu Yang <yangtiezhu@loongson.cn>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com,
Xuefeng Li <lixuefeng@loongson.cn>
Subject: [PATCH] MIPS: Add comment about CONFIG_MIPS32_O32 in loongson3_defconfig when build with Clang
Date: Thu, 4 Mar 2021 09:15:44 +0800 [thread overview]
Message-ID: <1614820544-10686-1-git-send-email-yangtiezhu@loongson.cn> (raw)
When build kernel with Clang [1]:
$ make CC=clang loongson3_defconfig
$ make CC=clang
there exists the following error:
Checking missing-syscalls for O32
CALL scripts/checksyscalls.sh
error: ABI 'o32' is not supported on CPU 'mips64r2'
make[1]: *** [Kbuild:48: missing-syscalls] Error 1
make: *** [arch/mips/Makefile:419: archprepare] Error 2
This is a known bug [2] with Clang, as Simon Atanasyan said,
"There is no plan on support O32 for MIPS64 due to lack of
resources".
It is not a good idea to remove this config due to GCC works
well, so add comment to point out this bug and suggest the
users to remove CONFIG_MIPS32_O32=y in defconfig when build
kernel with Clang.
[1] https://www.kernel.org/doc/html/latest/kbuild/llvm.html
[2] https://bugs.llvm.org/show_bug.cgi?id=38063
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
arch/mips/configs/loongson3_defconfig | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/mips/configs/loongson3_defconfig b/arch/mips/configs/loongson3_defconfig
index 0e79f81..cacf9dd 100644
--- a/arch/mips/configs/loongson3_defconfig
+++ b/arch/mips/configs/loongson3_defconfig
@@ -35,6 +35,9 @@ CONFIG_NUMA=y
CONFIG_SMP=y
CONFIG_HZ_256=y
CONFIG_KEXEC=y
+# Please remove CONFIG_MIPS32_O32=y when build with Clang
+# due to "ABI 'o32' is not supported on CPU 'mips64r2'",
+# https://bugs.llvm.org/show_bug.cgi?id=38063
CONFIG_MIPS32_O32=y
CONFIG_MIPS32_N32=y
CONFIG_VIRTUALIZATION=y
--
2.1.0
next reply other threads:[~2021-03-04 1:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-04 1:15 Tiezhu Yang [this message]
2021-03-04 2:02 ` [PATCH] MIPS: Add comment about CONFIG_MIPS32_O32 in loongson3_defconfig when build with Clang Nathan Chancellor
2021-03-04 3:48 ` Tiezhu Yang
2021-03-04 5:18 ` Nathan Chancellor
2021-03-04 23:08 ` Maciej W. Rozycki
2021-03-05 2:22 ` Jiaxun Yang
2021-03-05 2:46 ` Maciej W. Rozycki
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=1614820544-10686-1-git-send-email-yangtiezhu@loongson.cn \
--to=yangtiezhu@loongson.cn \
--cc=clang-built-linux@googlegroups.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=lixuefeng@loongson.cn \
--cc=nathan@kernel.org \
--cc=ndesaulniers@google.com \
--cc=tsbogend@alpha.franken.de \
/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).