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

[Kai Wolf]

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 <https://github.com/NewProggie/Talks/blob/master/2017-06-dep-management-with-cmake-MUC++.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 <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 <mailto:zehner.paul at jaxa.jp>
> www.jaxa.jp <http://www.jaxa.jp/>
> --
> 
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