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

[Levi Morrison]

On Wed, Nov 18, 2015 at 1:06 PM, Brad King <brad.king at kitware.com> wrote:

> On 11/18/2015 02:32 PM, Levi Morrison wrote:
> > After some other tweaks I am able to get Intel C++ compiler versions
> > 12.1.4 13.0.1, 14.0.0, 14.0.2, 15.0.0, 15.0.2, 15.0.3 to work!
> > Both tests found by `ctest -R CompileFeatures -VV` pass.
>
> Great.  However, the concern I raised earlier about detecting
> C++11 features in C++14 mode has not been addressed.  For example:
>
>  set(Intel14_CXX11 "__ICC >= 1400 && __INTEL_CXX11_MODE__")
>
> In C++14 mode this check fails so all the conditional features are
> detected to not exist.  Tests/CompileFeatures/CMakeFiles/CMakeOutput.log
> shows:
>
>  Detecting CXX [-std=c++1y] compiler features compiled with the following
> output:
>  ...
>     Feature record: CXX_FEATURE:0cxx_defaulted_move_initializers
>  ...
>  Detecting CXX [-std=c++11] compiler features compiled with the following
> output:
>  ...
>     Feature record: CXX_FEATURE:1cxx_defaulted_move_initializers
>
> The "0" and "1" are an internal detection code encoding for whether
> the feature exists according to the feature test specified.  We see
> that the C++14 mode does not think the feature exists.  This is not
> the case for GNU or other compilers.
>
> I'm not sure why this doesn't cause problems in the test, but the
> conditions need to be fixed to avoid this problem.  __INTEL_CXX11_MODE__
> only tells us that we are in *exactly* C++11 mode and so is not
> reliable for detecting C++11 features in C++14 mode.
>
> -Brad
>
>
My builds don't seem to be attempting this:

Detecting CXX [-std=c++1y] compiler features compiled with the following
> output


You are getting this out of the CMakeFiles/CMakeOutput.log, correct?
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