[cmake-developers] Add CXX_STANDARD support for Intel C++ compilers

[Brad King]

On 11/17/2015 03:23 PM, Levi Morrison wrote:
> Attached is the patch.

Thanks.  In the CompileFeatures test output one can see

    Detecting CXX compile features - failed

Then in Tests/CompileFeatures/CMakeFiles/CMakeError.log one can see
the error:

    .../Tests/CompileFeatures/CMakeFiles/feature_tests.cxx(32):
    error #14: extra text after expected end of preprocessing directive
      #if __ICC >= 1500 __INTEL_CXX14_MODE__
                        ^

This should fix it:

    -set(Intel15_CXX14 "__ICC >= 1500 __INTEL_CXX14_MODE__")
    +set(Intel15_CXX14 "__ICC >= 1500 && __INTEL_CXX14_MODE__")

After that the test runs so you can see the failures.

Also after fixing the above I see in
Tests/CompileFeatures/CMakeFiles/CMakeOutput.log the following:

    Detecting CXX [-std=c++14] compiler features compiled with the following output:
    ...
    icpc: command line warning #10159: invalid argument for option '-std'

This is with Intel 15.

More work may be needed to choose the proper flag based on the
version and platform:

 https://software.intel.com/en-us/articles/c14-features-supported-by-intel-c-compiler
 "C++14 features can enabled by using /Qstd=c++14 on Windows
  and -std=c++14 on Linux and Mac OS X"

Thanks,
-Brad