[mlpack-git] [mlpack/mlpack] `target_compile_features` from NewCXX11.cmake produce an error with LLVM's clang (#796)

[Ivan Georgiev]

Trying to build mlpack with OpenMP support on MacOS X (10.11.6) led me to using [llvm](http://www.llvm.org)'s clang (installed via [Homebrew](http://brew.sh) ). With appropriate `cmake` command that almost worked:

```
LDFLAGS=-L/usr/local/opt/llvm/lib CFLAGS=-I/usr/local/opt/llvm/include CPPFLAGS=-I/usr/local/opt/llvm/include\ -std=c++0x cmake -D CMAKE_C_COMPILER=clang-omp -D CMAKE_CXX_COMPILER=clang-omp++ ../
```

(`clang-omp` and `clang-omp++` are symlinks to llvm's binaries).

However, there was an error referring to `target_compile_features` directive in `CMake/NewCXX11.cmake` file:

```
CMake Error at CMake/NewCXX11.cmake:4 (target_compile_features):
  target_compile_features no known features for CXX compiler

  "Clang"

  version 3.8.1.
```


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