gcc 4.1.1 and qt 4.2 installation problem

[Sergey Kuzmin]

Root of that problem with float.h is 2 different version of this file

• %MINGW%\include\float.h
• %MINGW%\include\с++\4.1.1\float.h

The including %MINGW%\include\float.h are means also including
%MINGW%\include\с++\4.1.1\float.h, look at line "#include_next<float.h>"
The including %MINGW%\include\с++\4.1.1\float.h are means including
just one this file and losing _clear87 declaration.
Include dirs must be in right order (%MINGW%\include is first).

I use:

• binutils-2.17.50-20060824.tar.gz
• mingw-runtime-3.11.tar.gz
• mingw-make-3.80.0-3.tar.gz
• w32api-3.8.tar.gz
• Compiled from source GCC version 4.1.1

To compile Qt 4.2.2 Open Source Edition with MinGW GCC 4.1.1 do this:

1. Create new environment variable with correct include dirs order:
   CPLUS_INCLUDE_PATH=%MINGW%\include;%MINGW%\include \с++\4.1.1;%MINGW%\lib\gcc\mingw32\4.1.1\inclu de
   (Or remove "#include_next<float.h>" in %MINGW%\include\float.h
   and add "#include_next<float.h>" in %MINGW%\include\с++\4.1.1\float.h)
   I don't know how compile %MINGW%\libexec\gcc\mingw32\4.1.1\cc1plus.exe with
   correct inlude dir order inside. Please, tell me if you know.
   
   (Correct several small bugs)
2. Add to begin of file %QTDIR%\src\corelib\kernel\qeventdispatcher_win.cp p
   this declaration (any place before line 150: "QEventDispatcherWin32Private::~QEventDispatcherWi n32Private()"):
   

   LRESULT CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPARAM lp);

3. Replace line 578 in file %QTDIR%\src\gui\kernel\qkeymapper_win.cpp
   

   from:
   LCID newLCID = MAKELCID(GetKeyboardLayout(0), SORT_DEFAULT);
   to:
   LCID newLCID = MAKELCID(LOWORD(GetKeyboardLayout(0)), SORT_DEFAULT);

4. Add to begin of file %QTDIR%\src\gui\qwininputcontext_win.cpp
   this declaration (any place before line 451: "bool QWinInputContext::endComposition()"):
   

   extern bool qt_sendSpontaneousEvent(QObject *receiver, QEvent *event); // in qapplication_xxx.cpp

5. Compilation qaccessible_win.cpp will generate some errors.
   I just "configure -no-accessibility"

Now you can complile Qt "mingw32-make".

P.S. Sorry my little English. My mother tongue is Russian.

[Sergey Kuzmin]

P.S. About 5. %QTDIR%\src\gui\accessible\qaccessible_win.cpp compilation problem.
I try to comment second interface at line 267:

class QWindowsAccessible : public IAccessible, /*IOleWindow,*/ QAccessible

Compilation was successful. After that I found this error in gcc bug database.
Take a look to description GCC Bugzilla Bug 27067 "Compile errors with multiple
inheritance where the stdcall attribute is applied to virtual functions"
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27067

I try to compile Qt 4.2.2 with snapshots gcc-4.1-20061219 and gcc-4.2-20070102,
both compilation was unsuccessful. Same errors "'x' aliased to undefined symbol".
Patch was not included in source tree.

[brenden]

Anyone know the status of gcc 4 and Qt 4.4 with mingw? Is it still broken? I'm not sure why trolltech is ignoring this

[ChristianEhrlicher]

Anyone know the status of gcc 4 and Qt 4.4 with mingw? Is it still broken? I'm not sure why trolltech is ignoring this

First - gcc 4.x on windows is alpha - it's not meant to something else than playing around. Why should TT care of something that isn't meant to be stable??
Second - The issues were reported after 4.4.0beta/rc was released and therefore it did not go into 4.4.0 final. Should they release 4.4.1 just because you want to use a compiler which only has alpha quality?

If you just want to play around (nothing more can be done with this compiler) you should also be able to fix such issues yourself. Otherwise it doesn't make sense that you use alpha software...

[brenden]

First - gcc 4.x on windows is alpha - it's not meant to something else than playing around. Why should TT care of something that isn't meant to be stable??
Second - The issues were reported after 4.4.0beta/rc was released and therefore it did not go into 4.4.0 final. Should they release 4.4.1 just because you want to use a compiler which only has alpha quality?

If you just want to play around (nothing more can be done with this compiler) you should also be able to fix such issues yourself. Otherwise it doesn't make sense that you use alpha software...

I have been patching it myself. I was just curious to know if it was working yet. I need gcc 4 (and I find it perfectly stable on windows) because I use tr1 in my project.

[DaneAU]

I found a workaround after experiencing the same issues described in this thread with Qt 4.8.0 Beta 1 and MinGW.

I found refuge in setting up some environmental variables withe the following variables in this order.

INCLUDE
C:\MinGW\include;C:\MinGW\lib\gcc\mingw32\4.6.1\include

INCLUDE
C:\MinGW\include;C:\MinGW\lib\gcc\mingw32\4.6.1\include

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LIB
C:\MinGW\lib\gcc\mingw32\4.6.1;C:\MinGW\lib

LIB
C:\MinGW\lib\gcc\mingw32\4.6.1;C:\MinGW\lib

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Now this got rid of the immediate displaying of failing to configure properly with undefined references in the file

Qt\src\corelib\tools\qlocale_tools.cpp

Qt\src\corelib\tools\qlocale_tools.cpp

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However later on down the track i found that the error came up, without reading through a few thousand lines of output i decided that the #include <float.h> at the top of this file may be best hard coded. I know this is not a good thing to do, however it did get me configured correctly. So edit it and input the full path to the file float.h

replace

#include <float.h>

#include <float.h>

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With

#include "C:\\MinGW\\include\\float.h"

#include "C:\\MinGW\\include\\float.h"

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I did some reading on mailing lists and discovered that there is actually a problem with the MinGW specific to Qt and numerous people have raised the same question.

I know this is quite an old thread, however i stumbled onto it and figure perhaps others will also.