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 <[email protected]> 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" <[email protected]> > 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' >> >> _______________________________________________ >> Qgis-developer mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/qgis-developer >> >>
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