[Qgis-developer] QGis build with Mingw64

[Theuns Heydenrych]

To be honest there's no particular reason, but I will let you in on how
I/we decided on Mingw64

We are developing a cross platform application with GIS as one of the
application's modes.
We decide to use QGis libraries to provide the GIS functionality.
I played around with your(Tim Sutton) examples to use QGis widgets in a Qt
application, and with that created a Qt plugin that i tested in a sample
application to load the plugin, display the map canvas on a QFrame, to load
a geotiff , and to use the various maptools.

All this was done on a Ubuntu 12.04 64bit environment with Qt.

We would like to the same for Win7 64bit.
So I thought while i am going to use Qt 64bit on Win7 with Mingw64 i might
as well try to everything in Mingw64.

I hoped that the Qgis libs would already be available in 64bit for windows,
after reading mailing list postings of Nov 2012
http://osgeo-org.1560.n6.nabble.com/64bit-Windows-version-td5016852.html ,
but it looks like it did not materialise. According to the mailing
list thread it looks like there is interest for a 64bit version on Windows
for QGis.

So that's how i decided on Mingw64 and to be honest i have no experience in
the MS development tools, will it be possible then to build Qgis 64bit
 version with msvc 2008 and use the libraries in Qt64 bit?
I have no idea.

Suggestions will be appreciated, thank you.

Regards
Theuns Heydenrych



On Sun, Feb 24, 2013 at 11:29 AM, Tim Sutton <lists at linfiniti.com> wrote:

> Hi
>
> Any particular reason you are using mingw rather than msvc 2008 (which is
> well supported)?
>
> Regards
>
> Tim
> On 24 Feb 2013 9:33 AM, "Theuns Heydenrych" <theunsheydenrych at gmail.com>
> wrote:
>
>> I am trying to build QGis with Mingw64 on windows.
>> I have Qt64-4.8.4 on the machine and MSys and Mingw64.
>>
>> I have opened the CMakeLists.txt in QtCreator and set all
>> the dependencies for Qgis in the opening wizard for QtCreator.
>> When compiling i get the following error, can anybody give me some hints
>> where to start looking, to get it compiled?
>>
>> Best Regards
>> Theuns Heydenrych
>>
>> 09:11:03: Running steps for project qgis1.9.0...
>> 09:11:03: Starting: "C:\mingw\bin\mingw32-make.exe"
>> [  0%] Built target version
>> [  0%] Building CXX object src/core/CMakeFiles/qgis_core.dir/qgis.cpp.obj
>> src\core\CMakeFiles\qgis_core.dir\build.make:1234: recipe for target
>> 'src/core/CMakeFiles/qgis_core.dir/qgis.cpp.obj' failed
>> CMakeFiles\Makefile2:1118: recipe for target
>> 'src/core/CMakeFiles/qgis_core.dir/all' failed
>> makefile:145: recipe for target 'all' failed
>> C:\dev\cpp\Quantum\src\core\qgis.cpp:48:27: error: external linkage
>> required for symbol 'GEOPROJ4' because of 'dllexport' attribute
>> C:\dev\cpp\Quantum\src\core\qgis.cpp:53:27: error: external linkage
>> required for symbol 'GEOWKT' because of 'dllexport' attribute
>> C:\dev\cpp\Quantum\src\core\qgis.cpp:66:27: error: external linkage
>> required for symbol 'PROJECT_SCALES' because of 'dllexport' attribute
>> C:\dev\cpp\Quantum\src\core\qgis.cpp:70:27: error: external linkage
>> required for symbol 'GEO_EPSG_CRS_AUTHID' because of 'dllexport' attribute
>> C:\dev\cpp\Quantum\src\core\qgis.cpp:72:27: error: external linkage
>> required for symbol 'GEO_NONE' because of 'dllexport' attribute
>> mingw32-make[2]: *** [src/core/CMakeFiles/qgis_core.dir/qgis.cpp.obj]
>> Error 1
>> mingw32-make[1]: *** [src/core/CMakeFiles/qgis_core.dir/all] Error 2
>> mingw32-make: *** [all] Error 2
>> 09:11:06: The process "C:\mingw\bin\mingw32-make.exe" exited with code 2.
>> Error while building/deploying project qgis1.9.0 (kit: Desktop 64)
>> When executing step 'Make'
>>
>> _______________________________________________
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>>
>>
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