Support Clang

[dreuter]

When using clang I get the following error:

CMake Error at libpointmatcher_ros/ethzasl_point_cloud_vtk_tools/CMakeLists.txt:42 (message):
You need partial C++0x support for N2351, N2672, N1984. Currently this
build toolchain supports only GCC >= 4.4. If your compiler supports these
specifications, please send us a patch.

Please add clang to the list of supported compilers

[pomerlef]

Hi there,

Unfortunately, I'm not install to test that. The solution would be to use those if statements in the CMakeLists.txt:

if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
  # using Clang
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
  # using GCC
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Intel")
  # using Intel C++
elseif ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
  # using Visual Studio C++
endif()

If you could make those modifications in your personal branch and send a pull request once it's working on your side, I could test on my system to make sure that nothing breaks and add your patch on the repository.

[pomerlef]

Any follow up on that?

[dreuter]

Sadly I did not have have time to test this for now... I just switched our project back from clang to gcc for now.

Actually I am waiting for CMake 3.1 to be available in Ubuntu 14.04 (but I guess this won't happen), because it has proper C++11 support using target_compile_features.

I am aware, that we could just expand the list of checks for every single compiler, but it feels just very hacky. But maybe I will do it anyway, but sadly I can't promise when.