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@xxxxxxxxxxx> --- 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
