<![CDATA[Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ?]]>Hi

I tried to compile Qt with MinGW 4.8.0 rev1 from mingwbuilds project. Dependencies compiled fine. (Including OpenSSL, ICU, Freetype, Fontconfig) But Qt itself didn't. I got some errors when mingw32-make compiles ODBC driver. There are redefined symbols:

@
g++ -c -pipe -fno-keep-inline-dllexport -g -fno-exceptions -frtti -Wall -Wextra -DUNICODE -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -DQT_
PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I. -I"........\include" -I"........\include\QtSql" -I"........\include\QtSql\5.0.1" -I"........\include\QtSql\5.0
.1\QtSql" -I"........\include\QtCore" -I".moc\debug_shared" -I"C:\mingw64\include" -I"........\mkspecs\win32-g++" -o .obj\debug_shared\main.o main.cpp
In file included from C:\mingw64\include/sql.h:19:0,
from ../../../sql/drivers/odbc/qsql_odbc.h:66,
from main.cpp:44:
C:\mingw64\include/sqltypes.h:65:0: warning: "CALLBACK" redefined [enabled by default]
#define CALLBACK
^
In file included from c:\mingw64\x86_64-w64-mingw32\include\windows.h:69:0,
from ........\include/QtCore/../../src/corelib/global/qt_windows.h:66,
from ........\include/QtCore/qt_windows.h:1,
from ../../../sql/drivers/odbc/qsql_odbc.h:49,
from main.cpp:44:
c:\mingw64\x86_64-w64-mingw32\include\windef.h:81:0: note: this is the location of the previous definition
#define CALLBACK __stdcall
^
In file included from C:\mingw64\include/sql.h:19:0,
from ../../../sql/drivers/odbc/qsql_odbc.h:66,
from main.cpp:44:
C:\mingw64\include/sqltypes.h:87:29: error: conflicting declaration 'typedef short int TCHAR'
typedef signed short TCHAR;
^
In file included from c:\mingw64\x86_64-w64-mingw32\include\windef.h:139:0,
from c:\mingw64\x86_64-w64-mingw32\include\windows.h:69,
from ........\include/QtCore/../../src/corelib/global/qt_windows.h:66,
from ........\include/QtCore/qt_windows.h:1,
from ../../../sql/drivers/odbc/qsql_odbc.h:49,
from main.cpp:44:
c:\mingw64\x86_64-w64-mingw32\include\winnt.h:218:17: error: 'TCHAR' has a previous declaration as 'typedef WCHAR TCHAR'
typedef WCHAR TCHAR, *PTCHAR;
^
In file included from C:\mingw64\include/sql.h:19:0,
from ../../../sql/drivers/odbc/qsql_odbc.h:66,
from main.cpp:44:
C:\mingw64\include/sqltypes.h:105:26: error: conflicting declaration 'typedef short unsigned int WCHAR'
typedef unsigned short WCHAR;
^
@

Is there any plan to add patches for 4.8.0 or maintain compatibility with the new compiler in 5.0.2 or 5.1.0 ?

]]>https://forum.qt.io/topic/25783/is-qt-5-0-1-supposed-to-be-compiled-with-gcc-4-8-0RSS for NodeThu, 22 Oct 2026 18:25:04 GMTMon, 01 Apr 2013 13:09:22 GMT60<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Wed, 28 Aug 2013 14:12:16 GMT]]>A bit late, but since I stumbled across this post ... Qt 4.8 isn't compiled with -c++11 option by default, that's why it's not affected.

]]>https://forum.qt.io/post/175609https://forum.qt.io/post/175609Wed, 28 Aug 2013 14:12:16 GMT<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Fri, 05 Apr 2013 10:13:05 GMT]]>AFAIK the -c++11 option has problems even with 4.7.x

After all, 4.8 compiles Qt 5.0.1 and everything looks fine.

]]>https://forum.qt.io/post/172646https://forum.qt.io/post/172646Fri, 05 Apr 2013 10:13:05 GMT<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Wed, 03 Apr 2013 12:58:14 GMT]]>Someone reported that compilation will succeed on Linux if C++11 support is disabled, but not if you enable C++11: http://qt-project.org/forums/viewthread/26362/

Again, I'm unfamiliar with the internals. If you want to know the details, ask on the Development mailing list: http://lists.qt-project.org/mailman/listinfo/development

]]>https://forum.qt.io/post/172552https://forum.qt.io/post/172552Wed, 03 Apr 2013 12:58:14 GMT<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Tue, 02 Apr 2013 15:10:11 GMT]]>So why I am able to compile Qt 5 with 4.8 ? And why it works ?
I suppose if there is some compiler-level issues, then should be failures in binary generation, else if there is some ABI-level issue, it will compile but won't work under certain circumstances. Later one is more much more bigger trouble I think. (correct me if I'm wrong)

I will run auto test suits provided withing source, and post results here

]]>https://forum.qt.io/post/172476https://forum.qt.io/post/172476Tue, 02 Apr 2013 15:10:11 GMT<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Tue, 02 Apr 2013 14:46:19 GMT]]>I'm not sure of the details -- it's something to do with how the compiler handles template specialization.

This patch allowed Qt 5 to be compiled with GCC 4.8: https://codereview.qt-project.org/#change,48831 It arrived too late to make it into Qt 5.0.2, but it will be in Qt 5.1

]]>https://forum.qt.io/post/172472https://forum.qt.io/post/172472Tue, 02 Apr 2013 14:46:19 GMT<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Tue, 02 Apr 2013 12:38:43 GMT]]>I would like to know what is wrong with GCC 4.8 that makes Qt incompatible with it ? I just compiled Qt with 4.8 and it looks fine.

It would be nice if Qt has a automated test suite for framework itself...

]]>https://forum.qt.io/post/172455https://forum.qt.io/post/172455Tue, 02 Apr 2013 12:38:43 GMT<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Mon, 01 Apr 2013 14:38:59 GMT]]>Qt 5.0.1 is older than GCC 4.8, so it was obviously not released with GCC 4.8 compatibility in mind. Some issues with GCC 4.8 have been found: http://lists.qt-project.org/pipermail/development/2013-March/010587.html

]]>https://forum.qt.io/post/172338https://forum.qt.io/post/172338Mon, 01 Apr 2013 14:38:59 GMT<![CDATA[Reply to Is Qt 5.0.1 supposed to be compiled with GCC 4.8.0 ? on Mon, 01 Apr 2013 13:17:48 GMT]]>I just noticed that conflicts are relared to headers of unixODBC. Is unixODBC required for compiling Qt in Windows with MinGW? I think it's necessary for PSQL...

]]>https://forum.qt.io/post/172333https://forum.qt.io/post/172333Mon, 01 Apr 2013 13:17:48 GMT