[llvm-dev] Problem on cross-compiling compiler-rt

[Chris Bieneman via llvm-dev]

This is currently a rough area in our build system, but there are two CMake options you probably need to set.

(1) -DLLVM_BUILD_EXTERNAL_COMPILER_RT=On —> This option causes the build to use the just-built clang when building compiler-rt
(2) -DCOMPILER_RT_DEFAULT_TARGET_ARCH=??? —> This is where you specify which architecture you want to build the compiler-rt archives and libraries for

Hopefully in the near future we’ll have a better story for building this functionality.

Hope this helps,
-Chris


> On May 3, 2016, at 12:09 AM, 李阳 via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi WangLei,
> 
> Do you mean that the version 3.9 is LLVM project 3.9 and 3.5 is CMake 3.5?
> 
> In the guide[GetStarted.rst], the tutorial says before running CMake command, you must checkout all the source code.  CMake does not pickup newly added source directories in incremental builds.
> 
> Have you cross-compiled the LLVM/Clang for ARM, or other successfully?
> 
> Cheers,
> Liyang 
> 
> 2016-05-03 14:42 GMT+08:00 王磊 via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>>:
> 
> Hi.
> I'm trying to use Clang/LLVM as a cross-compiling toolchain. In previous version of LLVM with the old configure/Makefile building system, I'm able to build Clang/LLVM for target architecture with the host GCC firstly and then use the generated cross compiler to compile the compiler-rt project, and, consequently, I can get a cross compiler as well as the compiler-rt library. However, when I move to version 3.9 which abandoned configure/Makefile and uses CMake now, it always compile the compiler-rt simultaneously with the host GCC. The same problem is also existing in 3.5 CMake building system. It seems that in the CMake building system compiler-rt is not dependent on the generated toolchain. I also tried to compile the compiler-rt after Clang/LLVM has been built, and there is another problem that the generated Clang/LLVM cannot pass the CMake checking without compiler-rt, which is obvious... So is there any way that I can solve this problem. Thank you.
> 
> Lei Wang
> 
> 
>  <> <> <> <x-msg://106/#m_-2483977491504695984_> <>
> 
> 
> 
> 
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