On Thu, Aug 20, 2020 at 03:09:55PM -0700, 'Nick Desaulniers' via Clang Built Linux wrote:
While moving Android kernels over to use LLVM=1, we observe the failure when building in a hermetic docker image: HOSTCC scripts/basic/fixdep clang: error: unable to execute command: Executable "ld" doesn't exist!
The is because the build of the host utility fixdep builds the fixdep executable in one step by invoking the compiler as the driver, rather than individual compile then link steps.
Clang when configured from source defaults to use the system's linker, and not LLVM's own LLD, unless the CMake config -DCLANG_DEFAULT_LINKER='lld' is set when configuring a build of clang itself.
Don't rely on the compiler's implicit default linker; be explicit.
Cc: stable@vger.kernel.org Fixes: commit a0d1c951ef08 ("kbuild: support LLVM=1 to switch the default tools to Clang/LLVM")
Minor nit, "commit" is unnecessary here and might be flagged by some tag checking scripts.
Reported-by: Matthias Maennich maennich@google.com Signed-off-by: Nick Desaulniers ndesaulniers@google.com
Regardless of the above, this should work fine so:
Reviewed-by: Nathan Chancellor natechancellor@gmail.com
Makefile | 1 + 1 file changed, 1 insertion(+)
diff --git a/Makefile b/Makefile index def590b743a9..b4e93b228a26 100644 --- a/Makefile +++ b/Makefile @@ -436,6 +436,7 @@ OBJDUMP = llvm-objdump READELF = llvm-readelf OBJSIZE = llvm-size STRIP = llvm-strip +KBUILD_HOSTLDFLAGS += -fuse-ld=lld else CC = $(CROSS_COMPILE)gcc LD = $(CROSS_COMPILE)ld -- 2.28.0.297.g1956fa8f8d-goog