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

[王磊 via llvm-dev]

I found another bug when compiling external compiler-rt. When configuring LLVM with option -DLLVM_LIBDIR_SUFFIX=64, this option is not pass to compiler-rt which causes LLVM cmake modules cannot be found. Without -DLLVM_LIBDIR_SUFFIX=64 may cause other failures (lldb installation on 64-bit linux).


Lei


> -----Original Messages-----
> From: "Lei Wang via llvm-dev" <llvm-dev at lists.llvm.org>
> Sent Time: Friday, May 6, 2016
> To: "Renato Golin" <renato.golin at linaro.org>
> Cc: "LLVM Dev" <llvm-dev at lists.llvm.org>
> Subject: Re: [llvm-dev] Problem on cross-compiling compiler-rt
> 
> That's great. For multi targets compilerrt-rts,   in old llvm 3.5 configuremakefileconfigure/makefile system, it will build multiple libs for each target on the target list pass to clang building. but since you said compiler-rt now require sysroot for proper headers, then I don't think multi libs can be built together any more. However, according to my knowledge, without compiler-rt, a compiler is not able to full functionally work, if assuming it is the only compiler runtime lib we have. Clang is designed and able to be built for multi targets, so it should work with different compiler rt libs when it is built for multi targets. So from this viewpoint, multi target lib build is essential to support the multi target clang.
> I still do not understanding why including libs using system headers in buildin libs. And what does exactly compiler rt want to replace? In my opinion, it is libgcc?
> 
> Lei Wang
> 
> > 在 2016年5月6日，上午5:53，Renato Golin <renato.golin at linaro.org> 写道：
> > 
> >> On 5 May 2016 at 21:08, Chris Bieneman <beanz at apple.com> wrote:
> >> No. The plan is to have compiler-rt support one target per-configuration and to have LLVM & Clang’s build systems manage configuring compiler-rt for each target.
> >> 
> >> I’m still working out the exact details of what that will look like, but I’m expecting to have CMake take a list of targets probably specified by triple.
> > 
> > Sounds great, thanks for that work! And let me know when you have
> > something, I'd like to test it locally.
> > 
> > cheers,
> > --renato
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