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Date: Sat, 30 Oct 2021 00:25:54 -0400
From: Jeffrey Walton <noloader@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Failed to build musl 1.2.2 by using clang cross compiler
On Fri, Oct 29, 2021 at 11:46 PM Chunlin Zhu <simon_0214@...mail.com> wrote:
> Hello,
>
> On my computer I have built and install the llvm toolchain from the source
> code by using the below configuration, the llvm lib is installed in the
> /usr/local/lib folder.
> *cmake -S llvm -B build -G "Unix Makefiles"
> -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;libcxx;libcxxabi;compiler-rt;lld"
> -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="ARM;X86;AArch64" *
>
> And I am trying to build musl libc 1.2.2 for aarch64 by using llvm/clang,
> and I use the below configure:
> *./configure CC=clang --target=aarch64 CFLAGS="-v --target=aarch64
> --rtlib=compiler-rt" AR=/usr/local/bin/llvm-ar
> RANLIB=/usr/local/bin/llvm-ranlib LIBCC=-lcompiler_rt
> --syslibdir=/usr/local/lib*
>
> It report the error as below:
>
>
> And I find the compile phase is OK, the problem occurs during the link
> phase, I don't understand why finally gcc is invoked.
>
>
> By the way, the below configure works on my computer:
>
> ./configure CC=clang
>
> make -j4
>
Set LD to clang, too. It sounds like GCC is creeping in because it is a
default.
For the link error with --noexecstack, the linker needs -z,noexecstack. So
add -Wl,-z,noexecstack to LDFLAGS. See the ld(1) man page at
https://www.man7.org/linux/man-pages/man1/ld.1.html.
ASFLAGS should continue to use --noexecstack.
Jeff
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