linux-kernel - clang: error: cannot specify -o when generating multiple output files

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Date:   Mon, 21 Aug 2023 19:17:53 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     clang-built-linux <llvm@...ts.linux.dev>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: clang: error: cannot specify -o when generating multiple output files

Recently we have updated the toolchain clang-17 version.

While building selftests filesystems/binderfs, openat2, resctrl and x86
following warnings / errors noticed on the Linux next with clang-17.
But pass with gcc-13.

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Build logs:
========
binderfs_test
clang: error: cannot specify -o when generating multiple output files
...
openat2/openat2_test
clang: error: cannot specify -o when generating multiple output files
...
resctrl/resctrl_tests
clang: error: cannot specify -o when generating multiple output files
...
make[4]: Entering directory 'tools/testing/selftests/x86'
clang --target=x86_64-linux-gnu -fintegrated-as
-Werror=unknown-warning-option -Werror=ignored-optimization-argument
-Werror=option-ignored -Werror=unused-command-line-argument
--target=x86_64-linux-gnu -fintegrated-as -m64 -o
/home/tuxbuild/.cache/tuxmake/builds/1/build/kselftest/x86/single_step_syscall_64
-O2 -g -std=gnu99 -pthread -Wall -isystem
/home/tuxbuild/.cache/tuxmake/builds/1/build/usr/include -no-pie
-DCAN_BUILD_64 single_step_syscall.c helpers.h -lrt -ldl
clang: error: cannot specify -o when generating multiple output files
make[4]: *** [Makefile:78:
/home/tuxbuild/.cache/tuxmake/builds/1/build/kselftest/x86/single_step_syscall_64]
Error 1


Links:
 - https://storage.tuxsuite.com/public/linaro/lkft/builds/2UHhSg0TPLhjp9Uq9EFceoQd0VL/
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230821/testrun/19213760/suite/kselftest-x86/test/shardfile-x86/details/
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230821/testrun/19213728/suite/kselftest-openat2/test/shardfile-openat2/details/
 -

Steps to reproduce:
 - https://storage.tuxsuite.com/public/linaro/lkft/builds/2UHhSg0TPLhjp9Uq9EFceoQd0VL/tuxmake_reproducer.sh

tuxmake --runtime podman --target-arch x86_64 --toolchain clang-17
--kconfig https://storage.tuxsuite.com/public/linaro/lkft/builds/2UHhSg0TPLhjp9Uq9EFceoQd0VL/config
LLVM=1 LLVM_IAS=1 debugkernel cpupower headers kernel kselftest
modules


--
Linaro LKFT
https://lkft.linaro.org