[cfe-users] libcxx.llvm.org linux build instructions unclear

[Ben Pope]

On Wednesday, July 09, 2014 02:48 AM, Larry Evans wrote:
> The instructions on:
>    http://libcxx.llvm.org/
> say:
>     We can now run CMake:
>
>      CC=clang CXX=clang++ cmake -G "Unix Makefiles"
> -DLIBCXX_CXX_ABI=libstdc++
> -DLIBCXX_LIBSUPCXX_INCLUDE_PATHS="/usr/include/c++/4.7/;/usr/include/c++/4.7/x86_64-linux-gnu/"
> -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr <libc++-source-dir>
>
> however, it does not say what to put for <libc++-source-dir>
> or in which directory this command is to be run.  One might
> guess this command is to be run inb the directory where the buildit
> script is located, because that's what the earlier instructions
> (for Mac OS) were run from; however, that's not at all clear.

CMake encourages out of source build.

You run CMake in your build directory and you point it to your source 
diectory (the one with CMakeLists.txt).

E.g.:

/libcxx_build
/libcxx
    /include
    CMakeLists.txt

cd /libcxx/build
CMake ../libcxx

Or:
/libcxx
    /build
    /include
    CMakeLists.txt

cd /libcxx/build
CMake ..

Ben