[LLVMdev] Purpose of LLVM_ENABLE_LIBCXX and LLVM_ENABLE_LIBCXXABI

[Martell Malone]

Hi Michael,

I am wondering about the meaning of the cmake flags LLVM_ENABLE_LIBCXX and
> LLVM_ENABLE_LIBCXXABI. Are they used to indicate that if the C/C++ compiler
> for building LLVM is clang, and if this clang has support for libc++ with
> libc++Abi, that both lib++ and libc++abi should be used (instead of linking
> to the default, which at least on Linux is libstdc++)?


Yes that is actually what they are used for.

Please see
http://reviews.llvm.org/D2381

Kind Regards
Martell

On Tue, Jul 28, 2015 at 12:10 PM, Schlottke-Lakemper, Michael <
m.schlottke-lakemper at aia.rwth-aachen.de> wrote:

> Hi,
>
> I am wondering about the meaning of the cmake flags LLVM_ENABLE_LIBCXX and
> LLVM_ENABLE_LIBCXXABI. Are they used to indicate that if the C/C++ compiler
> for building LLVM is clang, and if this clang has support for libc++ with
> libc++Abi, that both lib++ and libc++abi should be used (instead of linking
> to the default, which at least on Linux is libstdc++)? If not, what is the
> canonical way of building LLVM with libc++? I am asking since I seem to
> have problems linking libLLVMSupport.a to a program while using clang with
> libc++, whereas the used clang/LLVM compiler was originally built with
> clang and libstdc++.
>
> Related to the first question: do the above flags also make clang use
> libc++ by default, or is this configurable via a different set of flags?
>
> Thanks a lot in advance
>
> Michael
>
> --
> Michael Schlottke-Lakemper
>
> SimLab Highly Scalable Fluids & Solids Engineering
> Jülich Aachen Research Alliance (JARA-HPC)
> RWTH Aachen University
>
> Wüllnerstraße 5a
> 52062 Aachen
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>
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> Web: http://www.jara.org/jara-hpc
>
>
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