llvm dev - Sep 2014 - [LLVMdev] [compiler-rt] cmake fails to configure for AArh64

Hi,

I am trying to cross compile LLVM/clang for AArch64 on an X86_64 Linux 
host using aarch64-linux-gnu-gcc / aarch64-linux-gnu-g++.
Important is that I have compiler-rt checked out to the llvm/projects 
folder.
"cmake -G 'Unix Makefiles' ..." is used to configure the build
folder.

The problem: cmake fails to configure.
The reason: cmake passes the -m64 option to aarch64-linux-gnu-g++, which 
the compiler does not need and doesn't understand as the option is 
redundant for AArch64.

I tracked down where -m64 was originating from and found the following 
in compiler-rt/CMakeLists.txt:

if (NOT MSVC)
   set(TARGET_64_BIT_CFLAGS "-m64")
   set(TARGET_32_BIT_CFLAGS "-m32")
else()
   set(TARGET_64_BIT_CFLAGS "")
   set(TARGET_32_BIT_CFLAGS "")
endif()

After the line with -m64 is commented out, cmake can complete the 
configuration and I am able to cross compile the whole LLVM.

Could you please advise if this is a known problem or anything more 
appropriate then mere commenting can be done to overcome this?

Thank you.

Kind regards,
Oleg
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On 24 September 2014 14:05, Oleg Ranevskyy <llvm.mail.list at gmail.com>
wrote:
> After the line with -m64 is commented out, cmake can complete the
> configuration and I am able to cross compile the whole LLVM.
Hi Oleg,

This option is only relevant to x86/64 platforms, not ARM. The
conditional should also check if the platform is x86.

cheers,
--renato

Thanks Renato!

I'll file a bug then so as not to forget to do this.

Kind regards,
Oleg

On 24.09.2014 17:42, Renato Golin wrote:
> On 24 September 2014 14:05, Oleg Ranevskyy <llvm.mail.list at
gmail.com> wrote:
>> After the line with -m64 is commented out, cmake can complete the
>> configuration and I am able to cross compile the whole LLVM.
> Hi Oleg,
>
> This option is only relevant to x86/64 platforms, not ARM. The
> conditional should also check if the platform is x86.
>
> cheers,
> --renato