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 CONFIG_MIPS32_O32=y directly in defconfig due to GCC works well, as Nathan said, the config should not even be selectable when build kernel with Clang, so just make MIPS32_O32 depends on !CC_IS_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/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 3a38d27..f6ba59f 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -3318,6 +3318,8 @@ config SYSVIPC_COMPAT config MIPS32_O32 bool "Kernel support for o32 binaries" depends on 64BIT + # https://bugs.llvm.org/show_bug.cgi?id=38063 + depends on !CC_IS_CLANG select ARCH_WANT_OLD_COMPAT_IPC select COMPAT select MIPS32_COMPAT -- 2.1.0
