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  1. Qt
  2. QTBUG-63455

Qt configure not expose -std Cxx configure choice on tests using linux clang

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P2: Important P2: Important
    • None
    • 5.9.1, 5.9.2, 5.9.3
    • Build System
    • None
    • Distro: Fedora Linux 26

      Compiler: Clang 4.0.1 final

      Qt: 5.9 branch 

       

      During configure process, using clang, test for libiinput fails as using nullptr and the compiler flags not exposing C++ 11 ( or higher ).

      On the current configure have the option -c+std c+11

      This is how the compilation of libinput happens, leading to Qt assume a wrong libinput installed breaking later the compilation:

      clang++ -c -pipe -g -w -fPIC  -I. -I/code/qt-everything/qt5/qtbase/mkspecs/linux-clang -o main.o main.cpp 
main.cpp:7:37: error: use of undeclared identifier 'nullptr' 
   libinput_event_pointer_has_axis(nullptr, LIBINPUT_POINTER_AXIS_SCROLL_VERTICAL); 
                                   ^ 
1 error generated.                                                                                                                                                                                                                            
make: *** [Makefile:297: main.o] Error 1

      As a test simply adding - std=c++11 in QMAKE_CXX_FLAGS on mkspecs/linux - clang makes test work properly and Qt compiled.

      The possible proper way is to expose the configure generated flags to compiler in the tests.

       

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            qtbuildsystem Qt Build System Team
            heliocastro Helio Chissini de Castro
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