gfortran works perfectly with Qt under Fedora12. But it does not work properly with minGW/Msys under windows XP.

Here is the modified example from qt/examples/opengl/grabber

f90main.f
Qt Code: 
  1. program f90main
  2. !-------------------------------------------------------
  3. !   Apr-05-2010  V1.0.0  Apr-05-2004  File: f90main.f
  4. !-------------------------------------------------------
  5.  
  6.     implicit none
  7.  
  8.     integer   (2)  :: i,iargc
  9.     integer   (4)  :: Narg
  10.     character (80) :: Farg(5)
  11.  
  12. !---get fortran command-line arguments
  13.     Narg = iargc()
  14.     do i=1,Narg
  15.         call getarg (i,Farg(i))
  16.     end do
  17.  
  18.     call Qtmain (Narg,Farg)
  19.  
  20. END program f90main
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qtmain.cpp
Qt Code: 
  1. /******************************************************
  2.   Apr-05-2010  V1.0.0  Apr-05-2010  File: qtmain.cpp
  3. ******************************************************/
  4.  
  5. #include <QApplication>
  6.  
  7. #include "mainwindow.h"
  8.  
  9. extern "C" {
  10.  
  11.     MainWindow *qt ;
  12.  
  13.     void qtmain_ (int *argc, char *argv[]) {
  14.  
  15.         QApplication app(*argc, argv);
  16.         MainWindow mainWin;
  17.         qt = &mainWin;
  18.         mainWin.show();
  19.         app.exec();
  20.     }
  21. }
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makefile for minGW/Msys under windows XP
Qt Code: 
  1. prog          = f90main
  2.  
  3. F90           = gfortran
  4. F90FLAGS      = -m32 -O2 -ffree-line-length-0 -ffree-form
  5.  
  6. LINK          = gfortran
  7.  
  8. f90Objects    = f90main.o
  9.  
  10. Qt   = /mingw/Qt/4.6.2
  11.  
  12. CC            = gcc
  13. CXX           = g++
  14. DEFINES       = -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_EVAL -DQT_DLL -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_
  15. NEEDS_QMAIN
  16. CFLAGS        = -m32 -O2 -Wall $(DEFINES)
  17. CXXFLAGS      = -m32 -O2 -frtti -fexceptions -mthreads -Wall $(DEFINES)
  18. INCPATH       = -I'c:/minGW/Qt/4.6.2/include/QtCore' -I'c:/minGW/Qt/4.6.2/include/QtGui' -I'c:/minGW/Qt/4.6.2/include/QtOpenGL' -I'c:/minGW/Qt/4.6.2/i
  19. nclude' \
  20.                 -I'c:/minGW/Qt/4.6.2/include/ActiveQt' -I'tmp/moc/release_shared' -I'c:/minGW/Qt/4.6.2/mkspecs/win32-g++'
  21.  
  22. LFLAGS        = -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -Wl,-s -mthreads -Wl -Wl,-subsystem,windows
  23. LIBS          = -L'c:/minGW/Qt/4.6.2/lib' -lstdc++ -lopengl32 -lglu32 -lgdi32 -luser32 -lmingw32 -lqtmain -lQtOpenGL4 -lQtGui4 -lQtCore4
  24.  
  25. ####### Files
  26. SOURCES       = qtmain.cpp glwidget.cpp mainwindow.cpp moc_glwidget.cpp moc_mainwindow.cpp
  27. OBJECTS       = qtmain.o   glwidget.o   mainwindow.o   moc_glwidget.o   moc_mainwindow.o
  28. TARGET        = $(prog).exe
  29.  
  30. MOC = $(Qt)/bin/moc
  31.  
  32. ####### Implicit rules
  33. .SUFFIXES: .o .c .cpp .cc .cxx .C .f .h
  34.  
  35. .f.o:
  36.         $(F90) -c $(F90FLAGS) $(F90INCPATH) -o $@ $<
  37.  
  38. .cpp.o:
  39.         $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"
  40.  
  41. .cc.o:
  42.         $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"
  43.  
  44. .cxx.o:
  45.         $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"
  46.  
  47. .C.o:
  48.         $(CXX) -c $(CXXFLAGS) $(INCPATH) -o "$@" "$<"
  49.  
  50. .c.o:
  51.         $(CC)  -c $(CFLAGS)   $(INCPATH) -o "$@" "$<"
  52.  
  53.  
  54. ####### Build rules
  55. $(TARGET):  $(f90Objects) $(OBJECTS)
  56.         $(LINK) $(LFLAGS) -o $(TARGET) $(f90Objects) $(OBJECTS) $(LIBS)
  57.  
  58. ####### moc
  59. moc_glwidget.cpp: glwidget.h
  60.         $(MOC) $(DEFINES) $(INCPATH) glwidget.h -o moc_glwidget.cpp
  61.  
  62. moc_mainwindow.cpp: mainwindow.h
  63.         $(MOC) $(DEFINES) $(INCPATH) mainwindow.h -o moc_mainwindow.cpp
  64.  
  65. moc_glwidget.o: moc_glwidget.cpp mainwindow.h
  66. moc_window.o:   moc_window.cpp mainwindow.h
  67.  
  68. all:    $(TARGET)
  69.  
  70. clean:
  71.         rm *.o
  72.         rm moc*.cpp
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For GNU Fortran (GCC) 4.4.3 under fedora12 with Qt 4.6.2, it works fine. But with GNU Fortran (GCC) 4.4.0 and GNU make 3.81 with Qt 4.6.2 under minGW/Msys/windows XP, it gave the errors:

Qt Code: 
  1. c:/minGW/Qt/4.6.2/lib/libqtmain.a(qtmain_win.o):qtmain_win.cpp:(.text+0x131): undefined reference to `qMain(int, char**)'
  2. collect2: ld returned 1 exit status
  3. make: *** [f90main.exe] Error 1
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Is there a walk-around solution for this problem?
Thanks