[CMake] Support of compile features for Fujitsu C++ Compiler

[Robert Maynard]

For an initial implementation I would base the work on the PGI
compiler module (
https://gitlab.kitware.com/cmake/cmake/blob/v3.14.3/Modules/Compiler/PGI-CXX.cmake
) not the GNU-CXX module.
This will allow you to add a new compiler with only meta-language
flags ( cxx_std_11, cxx_std_14, ... ) and you avoid the complexity of
having to manually build the feature tables.

On Fri, Apr 26, 2019 at 3:58 AM Zehner　Paul <zehner.paul at jaxa.jp> wrote:
>
> Kai,
>
>
> Thanks for your answer and for your presentation. So, I will try to add support for this Fujitsu compiler. Is there a list of the common compile features that I can base me upon? I plan use `GNU-CXX.cmake` as a source of inspiration.
>
>
> If I succeed to complete the `Fujitsu-CXX.cmake` file, I will propose it as a merge request.
>
>
> --
>
> Paul Zehner, Ph. D.
>
> Invited Researcher
>
> Numerical Simulation Research Unit
>
> Japan Aerospace Exploration Agency
>
> 7-44-1 Jindaiji Higashi-machi, Chofu-shi, Tokyo
>
> 182-8522, Japan
>
> Tel. +81-50-3362-7933
>
> Fax. +81-422-40-3327
>
> zehner.paul at jaxa.jp
>
> www.jaxa.jp
>
>
>
> ________________________________
> From: Kai Wolf <kai.wolf at gmail.com>
> Sent: Friday, April 26, 2019 16:22
> To: Zehner　Paul
> Cc: cmake at cmake.org
> Subject: Re: [CMake] Support of compile features for Fujitsu C++ Compiler
>
> If you want to add support to your specific compiler, you could add or extend another Fujitsu-DetermineCompiler.cmake
> file and append your CMAKE_MODULE_PATH in order to CMake to find it. You probably also need to adjust
> *Fujitsu-CXX.cmake, Fujitsu-CXX-FeatureTests.cmake and so on.
>
> I gave a talk a few years ago that shortly explains the whole process of CMake initialization and compiler verification which
> you can find here: https://github.com/NewProggie/Talks/blob/master/2017-06-dep-management-with-cmake-MUC%2B%2B.pdf
>
>
> Greetings,
>
> Kai
>
> http://kai-wolf.me
> http://effective-cmake.com
>
> Am 26.04.2019 um 07:35 schrieb Zehner　Paul <zehner.paul at jaxa.jp>:
>
> Hello Cmake community,
>
> I would like to use Cmake to build research simulation programs in a Fujitsu supercomputer environment. Unfortunately, it seems that Cmake (version 3.14) does not support any compile feature for the Fujitsu C++ compiler (FCCpx, version 2.0.0 P-id: T01815-02 (Jul 12 2018 13:13:18)). I add I am pretty new to Cmake. Searching for similar issues, I found only this [thread](https://cmake.org/pipermail/cmake-developers/2014-August/010989.html), which talk about basic support of the compiler.
>
> I tested it on a simple project, and the line:
>
> ```cmake
> target_compile_features(test PUBLIC cxx_std_11)
> ```
>
> fails with this message:
>
> ```
> CMake Error at CMakeLists.txt:15 (target_compile_features):
>   target_compile_features no known features for CXX compiler
>
>   "Fujitsu"
>
>   version .
>
> ```
>
> So, it seems that the compiler is detected (without its version), but compile features are not known. To be sure, I ran this simple test to list any supported features:
>
> ```cmake
> cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
> project(foobar CXX)
> message("Your C++ compiler supports these C++ features:")
> foreach(i ${CMAKE_CXX_COMPILE_FEATURES})
>     message("${i}")
> endforeach()
> ```
>
> and no feature are listed.
>
> So, what should I do from now on? Are there some people here using Cmake with Fujitsu who could help me? Should I propose a patch with the different compile features of the compiler? Or should I address it to Fujitsu?
>
> Thanks for your help,
>
> --
> Paul Zehner, Ph. D.
> Invited Researcher
> Numerical Simulation Research Unit
> Japan Aerospace Exploration Agency
> 7-44-1 Jindaiji Higashi-machi, Chofu-shi, Tokyo
> 182-8522, Japan
> Tel. +81-50-3362-7933
> Fax. +81-422-40-3327
> zehner.paul at jaxa.jp
> www.jaxa.jp
> --
>
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