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List:       kde-devel
Subject:    Re: Unable to compile KWidgetsAddons
From:       Nate Graham <nate () kde ! org>
Date:       2018-04-06 14:05:21
Message-ID: 54feac92-1966-3135-23ac-d5f00d1dc5fb () kde ! org
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I'm somewhat embarrassed to admit that I was doing an in-source build 
and no amount of `make clean` and `rm CMakeCache.txt` fixed the problem, 
but doing a proper out-of-source build worked just fine. That'll teach me...

Nate


On 04/06/2018 02:58 AM, Kevin Funk wrote:
> On Thursday, 29 March 2018 15:53:25 CEST Nate Graham wrote:
>> In trying to test out a KWidgetsAddons patch, I find that I'm unable to
>> compile it on KDE Neon dev unstable the code due to a CMake error:
>>
>>
>> CMake Error in autotests/CMakeLists.txt:
>>     No known features for CXX compiler
>>
>>     "GNU"
>>
>>     version 5.4.0.
>>
>> Full output available at https://paste.kde.org/piyy4wsnl
> 
> Heya,
> 
> FYI: The compile-feature [1] is used by the CMake Config files installed by
> Qt. For Qt it is used to figure out when and how to pass the i.e. the resp. `-
> std=...` flag for GNU-like compilers for users of Qt.
> 
> Usually you get that kind of error in case you're trying to use an unsupported
> compiler for which CMake doesn't know the availability of the C++ features. A
> typical example is Android GCC.
> 
> I'm surprised you get that error by a standard GCC...? Would be nice to figure
> out what's going wrong. Maybe `cmake --trace` or `cmake --debug-output` can
> help.
> 
> Please check the following link for a work-around:
>    https://stackoverflow.com/a/40256862/592636
> 
> [1] https://cmake.org/cmake/help/v3.8/manual/cmake-compile-features.7.html
> 
> Regards,
> Kevin
> 
>> My g++ version looks okay:
>>
>> $ g++ --version
>> g++ (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
>> Copyright (C) 2015 Free Software Foundation, Inc.
>>
>>
>> Nate
> 
> 

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