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Date: Sat, 22 Aug 2020 14:13:38 +0900 From: Masahiro Yamada <masahiroy@...nel.org> To: Nick Desaulniers <ndesaulniers@...gle.com> Cc: stable <stable@...r.kernel.org>, Matthias Maennich <maennich@...gle.com>, Michal Marek <michal.lkml@...kovi.net>, Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, clang-built-linux <clang-built-linux@...glegroups.com> Subject: Re: [PATCH] Makefile: add -fuse-ld=lld to KBUILD_HOSTLDFLAGS when LLVM=1 On Fri, Aug 21, 2020 at 7:10 AM 'Nick Desaulniers' via Clang Built Linux <clang-built-linux@...glegroups.com> 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. I do not understand this patch. The host compiler should be able to link executables without any additional settings. So, can you link a hello world program in your docker? masahiro@zoe:~$ cat test.c #include <stdio.h> int main(void) { printf("helloworld\n"); return 0; } masahiro@zoe:~$ clang test.c If this fails, your environment is broken. Just do -DCLANG_DEFAULT_LINKER='lld' if you know GNU ld is missing in your docker environment. > Cc: stable@...r.kernel.org > Fixes: commit a0d1c951ef08 ("kbuild: support LLVM=1 to switch the default tools to Clang/LLVM") > Reported-by: Matthias Maennich <maennich@...gle.com> > Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.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 > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@...glegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200820220955.3325555-1-ndesaulniers%40google.com. -- Best Regards Masahiro Yamada
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