llvm dev - Mar 2015 - [LLVMdev] How to Cross Compile libcompiler_rt Static Library?

Hi,

I've cross-compiled musl-libc to arm binaries with clang. It needs
functions from static runtime library "libcompiler_rt.a". I tried to
build
compile_rt outside the llvm source tree. Using command like "make
clang_linux", I can easily build "libcompiler_rt.a" for my host
machine,
which is X86_64. But how can I *cross-compile* the compiler_rt runtime
libraries?

According to the following websites:
https://www.bountysource.com/issues/5139020-linux-arm-platform-support-missing-for-compiler-rt-cross-compiler

https://www.bountysource.com/issues/5139002-addresssanitizer-tests-fail-with-dllvm_targets_to_build-arm

It seems that the makefile does not support non-X86 targets. Someone tried
cmake failed as well. Any suggestions?

Thanks,
Chao
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Hi there,

2015-03-29 10:14 GMT+02:00 Chao Yan <yanchao2012 at
gmail.com>:
> I've cross-compiled musl-libc to arm binaries with clang. It needs
functions
> from static runtime library "libcompiler_rt.a". I tried to build
compile_rt
> outside the llvm source tree. Using command like "make
clang_linux", I can
> easily build "libcompiler_rt.a" for my host machine, which is
X86_64. But
> how can I *cross-compile* the compiler_rt runtime libraries?
I am cross-compiling compiler-rt for my specific use-case. That said,
I'm cross-compiling from x86-64 to x86-64, but for a different ABI.
This is what I use:

https://github.com/NuxiNL/cloudlibc/wiki/Building-runtime-libraries#user-content-compiler-rt

As you can see, I'm using CMake. Works pretty well so far. Hopefully
something like this will work for you as well?

-- 
Ed Schouten <ed at 80386.nl>

2015-03-29 3:33 GMT-05:00 Ed Schouten <ed at 80386.nl>:
> I am cross-compiling compiler-rt for my specific use-case. That said,
> I'm cross-compiling from x86-64 to x86-64, but for a different ABI.
> This is what I use:
>
>
>
https://github.com/NuxiNL/cloudlibc/wiki/Building-runtime-libraries#user-content-compiler-rt
>
> -DCMAKE_CROSSCOMPILING=True
>
> As you can see, I'm using CMake. Works pretty well so far. Hopefully
> something like this will work for you as well?
>
I tried "cmake ../compiler-rt -DCMAKE_C_COMPILER=clang
-DCMAKE_CXX_COMPILER=clang++  -DLLVM_NATIVE_ARCH=ARM
-DLLVM_TARGETS_TO_BUILD=ARM -DTARGET_TRIPLE=armv-none-linux-gnueabi
 -DCMAKE_CROSSCOMPILING=True". It will still build X86_64 version.

I also tried "cmake ../compiler-rt
-DCMAKE_C_COMPILER=/usr/local/arm-2009q3/bin/arm-none-linux-gnueabi-gcc
-DCMAKE_CXX_COMPILER=/usr/local/arm-2009q3/bin/arm-none-linux-gnueabi-g++
 -DLLVM_NATIVE_ARCH=ARM -DLLVM_TARGETS_TO_BUILD=ARM
-DTARGET_TRIPLE=armv-none-linux-gnueabi  -DCMAKE_CROSSCOMPILING=True
". the configure process generate errors:

CMake Error at cmake/config-ix.cmake:111 (message):
Cannot compile for x86_64:

It seems that the cmake only works for X86 target?

Thanks,
Chao
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