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Date: Mon, 11 Oct 2021 10:20:22 -0700
From: Khem Raj <raj.khem@...il.com>
To: musl@...ts.openwall.com
Subject: Re: Newbie cross compiling with LLVM
On Sun, Oct 10, 2021 at 4:22 PM Matt Andrews <mattandrews@...il.com> wrote:
>
> > Have try with setting passing AR=clang-ar?
>
> I actually set
>
> AR=/usr/lib/llvm-13/bin/llvm-ar
>
> Then I set
>
> RANLIB=/usr/lib/llvm-13/bin/llvm-ranlib
>
> That got me a little further down the road, but now I'm getting this error
>
> /usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi
> Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu elf_l1om elf_k1om i386pep i386pe
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
>
> I added this to CFLAGS
>
> -B/usr/lib/llvm-13/bin
>
> But it still uses the system linker.
>
> How do I specify which linker to use?
I guess you need a cross linker here if your -target option matches
exactly with cross prefix it will find it.
>
> On Mon, 11 Oct 2021 at 09:44, Quentin Rameau <quinq@...th.space> wrote:
>>
>> > Hello everyone,
>>
>> Hi Matt,
>>
>> > I'm trying to cross compile from Ubuntu 20.04 to armv7a-linux-musleabihf
>> > using LLVM. Configure looks like this
>> >
>> > ./configure \
>> > --prefix=$VECX/usr \
>> > --syslibdir=$VECX/lib \
>> > --target=armv7a-linux-eabihf \
>> > CC=/usr/lib/llvm-13/bin/clang \
>> > CFLAGS="--target=armv7a-linux-eabihf -mcpu=cortex-a8"
>> >
>> > Then
>> >
>> > make && make install
>> >
>> > The compilation fails with the following
>> >
>> > make: armv7a-linux-eabihf-ar: Command not found
>> > make: *** [Makefile:167: lib/libc.a] Error 127
>> >
>> > It's looking for an archiver from a cross compiler toolchain, but should be
>> > using llvm-ar.
>> >
>> > Which configure options should I use to get LLVM to cross compile
>> > successfully?
>>
>> Have try with setting passing AR=clang-ar?
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