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Thread: Confusing syntax errors in C header when compiling Qt project

  1. 27th January 2015, 10:16 #1
    antimatter
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    Default Confusing syntax errors in C header when compiling Qt project

    Hello,

    I started working again at a Qt project and upgraded it from Qt 5.2.1 to 5.4. Now I get very confusing compiler errors, when I build this project in Qt Creator. The project uses a C library called "libnova" and the MinGW (GCC 4.9.x) compiler from Qt 5.4 finds one of its header files quite offending. I didn't experience this issue when I last worked on that project. Compiling with Qt 5.3 or 5.2.1 kit yield the same results.
    I am using the latest libnova code, as I contributed some fixes for Windows. I compiled the library (as before) with MinGW via MSYS.

    Here's the compiler output:
    Qt Code: 
    1. 23:37:45: Running steps for project pyro...
    2. 23:37:45: Starting: "C:\Qt\Tools\mingw491_32\bin\mingw32-make.exe" clean
    3. C:/Qt/Tools/mingw491_32/bin/mingw32-make -f Makefile.Debug clean
    4. mingw32-make[1]: Entering directory 'D:/Andreas/Qt/build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug'
    5. del debug\moc_mainwindow.cpp debug\moc_pyroengine.cpp debug\moc_imageanalysiswidget.cpp debug\moc_projectlistwidget.cpp debug\moc_skyobjectlistmodel.cpp debug\moc_miniatureoverlay.cpp debug\moc_imageloader.cpp
    6. D:\Andreas\Qt\build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug\debug\moc_mainwindow.cpp konnte nicht gefunden werden
    7. del ui_mainwindow.h ui_imageanalysiswidget.h ui_projectlistwidget.h
    8. del debug\main.o debug\mainwindow.o debug\pyromath.o debug\testcases.o debug\pyroengine.o debug\imageanalysiswidget.o debug\projectlistwidget.o debug\skyobjectlistmodel.o debug\miniatureoverlay.o debug\imageloader.o debug\moc_mainwindow.o debug\moc_pyroengine.o debug\moc_imageanalysiswidget.o debug\moc_projectlistwidget.o debug\moc_skyobjectlistmodel.o debug\moc_miniatureoverlay.o debug\moc_imageloader.o
    9. D:\Andreas\Qt\build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug\debug\main.o konnte nicht gefunden werden
    10. mingw32-make[1]: Leaving directory 'D:/Andreas/Qt/build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug'
    11. C:/Qt/Tools/mingw491_32/bin/mingw32-make -f Makefile.Release clean
    12. mingw32-make[1]: Entering directory 'D:/Andreas/Qt/build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug'
    13. del release\moc_mainwindow.cpp release\moc_pyroengine.cpp release\moc_imageanalysiswidget.cpp release\moc_projectlistwidget.cpp release\moc_skyobjectlistmodel.cpp release\moc_miniatureoverlay.cpp release\moc_imageloader.cpp
    14. D:\Andreas\Qt\build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug\release\moc_mainwindow.cpp konnte nicht gefunden werden
    15. del ui_mainwindow.h ui_imageanalysiswidget.h ui_projectlistwidget.h
    16. D:\Andreas\Qt\build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug\ui_mainwindow.h konnte nicht gefunden werden
    17. del release\main.o release\mainwindow.o release\pyromath.o release\testcases.o release\pyroengine.o release\imageanalysiswidget.o release\projectlistwidget.o release\skyobjectlistmodel.o release\miniatureoverlay.o release\imageloader.o release\moc_mainwindow.o release\moc_pyroengine.o release\moc_imageanalysiswidget.o release\moc_projectlistwidget.o release\moc_skyobjectlistmodel.o release\moc_miniatureoverlay.o release\moc_imageloader.o
    18. D:\Andreas\Qt\build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug\release\main.o konnte nicht gefunden werden
    19. mingw32-make[1]: Leaving directory 'D:/Andreas/Qt/build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug'
    20. 23:37:45: The process "C:\Qt\Tools\mingw491_32\bin\mingw32-make.exe" exited normally.
    21. 23:37:45: Configuration unchanged, skipping qmake step.
    22. 23:37:45: Starting: "C:\Qt\Tools\mingw491_32\bin\mingw32-make.exe" 
    23. C:/Qt/Tools/mingw491_32/bin/mingw32-make -f Makefile.Debug
    24. mingw32-make[1]: Entering directory 'D:/Andreas/Qt/build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug'
    25. C:\Qt\5.4\mingw491_32\bin\uic.exe ..\pyro\mainwindow.ui -o ui_mainwindow.h
    26. C:\Qt\5.4\mingw491_32\bin\uic.exe ..\pyro\imageanalysiswidget.ui -o ui_imageanalysiswidget.h
    27. C:\Qt\5.4\mingw491_32\bin\uic.exe ..\pyro\projectlistwidget.ui -o ui_projectlistwidget.h
    28. g++ -c -pipe -fno-keep-inline-dllexport -fopenmp -std=gnu++11 -g -frtti -Wall -Wextra -fexceptions -mthreads -DUNICODE -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I..\pyro -I"..\..\..\Libraries\libnova-latest\src" -I"..\..\..\Libraries\Eigen3" -I"..\..\..\Libraries\ceres-solver-git\include" -I"..\..\..\Libraries\ceres-solver-git\internal\ceres\miniglog" -I"..\..\..\Libraries\ceres-solver-git\config" -I"C:\Qt\5.4\mingw491_32\include" -I"C:\Qt\5.4\mingw491_32\include\QtWidgets" -I"C:\Qt\5.4\mingw491_32\include\QtGui" -I"C:\Qt\5.4\mingw491_32\include\QtCore" -I"debug" -I"." -I"." -I"C:\Qt\5.4\mingw491_32\mkspecs\win32-g++" -o debug\main.o ..\pyro\main.cpp
    29. In file included from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/i686-w64-mingw32/bits/gthr-default.h:35:0,
    30.                  from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/i686-w64-mingw32/bits/gthr.h:148,
    31.                  from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/ext/atomicity.h:35,
    32.                  from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/bits/basic_string.h:39,
    33.                  from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/string:52,
    34.                  from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/random:40,
    35.                  from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/bits/stl_algo.h:66,
    36.                  from C:/Qt/Tools/mingw491_32/i686-w64-mingw32/include/c++/algorithm:62,
    37.                  from C:\Qt\5.4\mingw491_32\include/QtCore/qglobal.h:81,
    38.                  from C:\Qt\5.4\mingw491_32\include/QtCore/qcoreapplication.h:37,
    39.                  from C:\Qt\5.4\mingw491_32\include\QtWidgets/qapplication.h:37,
    40.                  from C:\Qt\5.4\mingw491_32\include\QtWidgets/QApplication:1,
    41.                  from ..\pyro\main.cpp:1:
    42. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: expected unqualified-id before '{' token
    43.  struct tm *gmtime_r (time_t *t, struct tm *gmt);
    44.             ^
    45. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: expected ')' before '{' token
    46. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: expected primary-expression before 'struct'
    47.  struct tm *gmtime_r (time_t *t, struct tm *gmt);
    48.             ^
    49. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: expected '}' before 'struct'
    50. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: expected constructor, destructor, or type conversion before ';' token
    51.  struct tm *gmtime_r (time_t *t, struct tm *gmt);
    52.             ^
    53. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: '___tmp_tm' does not name a type
    54.  struct tm *gmtime_r (time_t *t, struct tm *gmt);
    55.             ^
    56. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: expected unqualified-id before 'if'
    57.  struct tm *gmtime_r (time_t *t, struct tm *gmt);
    58.             ^
    59. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: '___tmp_tm' does not name a type
    60.  struct tm *gmtime_r (time_t *t, struct tm *gmt);
    61.             ^
    62. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:230:12: error: expected unqualified-id before ')' token
    63.  struct tm *gmtime_r (time_t *t, struct tm *gmt);
    64.             ^
    65. In file included from ..\..\..\Libraries\libnova-latest\src/libnova/libnova.h:127:0,
    66.                  from ..\pyro\pyromath.h:6,
    67.                  from ..\pyro\pyroengine.h:16,
    68.                  from ..\pyro\mainwindow.h:10,
    69.                  from ..\pyro\main.cpp:3:
    70. ..\..\..\Libraries\libnova-latest\src/libnova/utility.h:258:1: error: expected declaration before '}' token
    71.  };
    72.  ^
    73. Makefile.Debug:2583: recipe for target 'debug/main.o' failed
    74. mingw32-make[1]: *** [debug/main.o] Error 1
    75. mingw32-make[1]: Leaving directory 'D:/Andreas/Qt/build-pyro-Desktop_Qt_5_4_0_MinGW_32bit-Debug'
    76. mingw32-make: *** [debug] Error 2
    77. makefile:34: recipe for target 'debug' failed
    78. 23:37:48: The process "C:\Qt\Tools\mingw491_32\bin\mingw32-make.exe" exited with code 2.
    79. Error while building/deploying project pyro (kit: Desktop Qt 5.4.0 MinGW 32bit)
    80. When executing step "Make"
    81. 23:37:48: Elapsed time: 00:03.
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    You can see the libnova's header file "utility.h" here: http://sourceforge.net/p/libnova/lib...nova/utility.h

    Honestly, I don't understand the compilers complaints. Most of the error messages do not seem to be related to the line declaring the gmtime_r() function. Can someone help, please?


    Andreas
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  2. 27th January 2015, 20:19 #2
    antimatter
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    Default Re: Confusing syntax errors in C header when compiling Qt project

    Okay, I've got something here.

    The compiler errors are only about those gmtime_r and strtok_r declarations. I just commented out these two declarations in <utility.h> and built my project again. It compiles without errors. Apparently, the C library now defines these two functions.

    Digging a little deeper into <time.h> from the toolchain bundled with Qt, I found this for gmtime_r:
    Qt Code: 
    1. #ifndef gmtime_r
    2. #define gmtime_r(_Time,_Tm) ...
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    <pthread.h> contains the same thing for strtok_r. Was this added to the C library recently?
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  3. 29th January 2015, 09:02 #3
    antimatter
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    Default Re: Confusing syntax errors in C header when compiling Qt project

    Update:

    This small example can also reproduce these compiler errors:
    Qt Code: 
    1. #include <iostream>
    2. #include <libnova/utiltiy.h>
    3.  
    4. int main() { return 0; }
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    Errors occure, because <iostream> also includes <pthread.h> somewhere down the road. And <pthread.h> has this funny stuff in it:

    Qt Code: 
    1. #undef gmtime_r
    2. #define gmtime_r(_Time,_Tm)     ({ struct tm *___tmp_tm;                \
    3.                                                 pthread_testcancel();   \
    4.                                                 ___tmp_tm = gmtime((_Time)); \
    5.                                                 if (___tmp_tm) {        \
    6.                                                   *(_Tm) = *___tmp_tm;  \
    7.                                                   ___tmp_tm = (_Tm);    \
    8.                                                 }                       \
    9.                                                 ___tmp_tm;      })
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    Then comes <libnova/utility.h> and declares:

    Qt Code: 
    1. struct tm *gmtime_r (time_t *t, struct tm *gmt);
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    When I include <libnova/utility.h> first, it will compile sucessfully. But being forced to include headers in a specific order feels very wrong. At least in this case. And it may not be possible in a very big project.

    Is this a bug in the C library provided with MinGW?
    What's the best way to handle this? For the time being, I could surround the conflicting declaratioin in <libnova/utility.h> with #ifndef...#endif.

    Any advice?
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  4. 29th January 2015, 09:24 #4
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    Default Re: Confusing syntax errors in C header when compiling Qt project

    Quote Originally Posted by antimatter View Post
    Any advice?
    Reverse the order of includes.

    Never touch any header files outside your project, fix problems in your code instead.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.

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