[Qt-creator] Building a plugin on windows.

[Eike Ziller]

> On Apr 20, 2016, at 10:27 AM, Eike Ziller <eike.ziller at qt.io> wrote:
> 
>> 
>> On Apr 20, 2016, at 10:25 AM, Eike Ziller <eike.ziller at qt.io> wrote:
>> 
>>> 
>>> On Apr 20, 2016, at 7:44 AM, Hugo Parente Lima <hugo.pl at gmail.com> wrote:
>>> 
>>> Hi,
>>> 
>>> I'm a newbie about Windows but started to try to compile my QtC plugin under a Windows7 VM, I did the following steps:
>>> 
>>> 1. Installed Qt + QtCreator (checked some MSVC runtime libraries too).
>>> 2. Cloned QtC and checked it to version 3.6.1.
>>> 3. Cloned my plugin[1] and checked it to branch qtc-3.6.
>>> 4. Did open the plugin project (.pro) into QtCreator.
>>> 5. Added QTC_SOURCE and QTC_BUILD variables to the qmake call.
>>> 
>>> Triggered the compilation and everything went fine until... link time, on Windows my plugin is looking for some dependencies unknow to me, here the linker output.
>>> 
>>> 
>>> 02:30:05: Starting: "C:\Qt\Tools\mingw492_32\bin\mingw32-make.exe"
>>> C:/Qt/Tools/mingw492_32/bin/mingw32-make -f Makefile.Release
>>> mingw32-make[1]: Entering directory 'C:/Users/IEUser/Documents/GitHub/build-ruby-Desktop_Qt_5_6_0_MinGW_32bit-Release'
>>> g++ -Wl,-s -shared -Wl,-subsystem,windows -mthreads -Wl,--out-implib,C:\Qt\Tools\QtCreator\lib\qtcreator\plugins\libRuby.a -o C:\Qt\Tool
>>> s\QtCreator\lib\qtcreator\plugins\Ruby.dll object_script.Ruby.Release  -LC:\Qt\Tools\QtCreator\lib\qtcreator -LC:\Qt\Tools\QtCreator\lib
>>> \qtcreator\plugins -lCore -lTextEditor -lProjectExplorer -lAggregation -lExtensionSystem -lQtcSsh -lUtils -LC:\Qt\5.6\mingw49_32\lib C:\
>>> Qt\5.6\mingw49_32\lib\libQt5Widgets.a C:\Qt\5.6\mingw49_32\lib\libQt5Gui.a C:\Qt\5.6\mingw49_32\lib\libQt5Concurrent.a C:\Qt\5.6\mingw49
>>> _32\lib\libQt5Network.a C:\Qt\5.6\mingw49_32\lib\libQt5Core.a
>>> C:/Qt/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lAggregation
>>> C:/Qt/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lExtensionSystem
>>> C:/Qt/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lQtcSsh
>>> C:/Qt/Tools/mingw492_32/bin/../lib/gcc/i686-w64-mingw32/4.9.2/../../../../i686-w64-mingw32/bin/ld.exe: cannot find -lUtils
>>> collect2.exe: error: ld returned 1 exit status
>>> Makefile.Release:168: recipe for target 'C:\Qt\Tools\QtCreator\lib\qtcreator\plugins\Ruby.dll' failed
>>> mingw32-make[1]: *** [C:\Qt\Tools\QtCreator\lib\qtcreator\plugins\Ruby.dll] Error 1
>>> mingw32-make[1]: Leaving directory 'C:/Users/IEUser/Documents/GitHub/build-ruby-Desktop_Qt_5_6_0_MinGW_32bit-Release'
>>> makefile:34: recipe for target 'release’ failed
>> 
>> To me it looks like you tried to build your plugin in Release against a Qt Creator in Debug, so it tries to find e.g. Aggregation.dll where there is only Aggregationd.dll etc (note the additional ‘d’ at the end).
> 
> Hm, actually it looks like you built against the release build of Qt Creator that comes with the Qt package
> C:\Qt\Tools\QtCreator\lib\qtcreator\plugins
> 
> The Qt Creator packages are built with MSVC2013. You cannot link a MinGW compiled plugin against that.

And I should add:

On Windows the Qt Creator packages do not contain all the necessary files (*.lib) to develop against it anyhow.
You need to do your own build of Qt Creator and link against that, even when using MSVC2013.

> Br, Eike
>> 
>>> Ugly as an usual linker output, but these 3 plugins were not in Windows QtC install, however these plugins exists when I compile QtC on Linux. should I add some Windows specific flag in the .pro?
>>> 
>>> Thanks in advance.
>>> 
>>> [1] https://github.com/hugopl/RubyCreator/
>>> 
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>> 
>> -- 
>> Eike Ziller
>> Principal Software Engineer
>> 
>> The Qt Company GmbH
>> Rudower Chaussee 13, D-12489 Berlin
>> Geschäftsführer: Mika Pälsi, Juha Varelius, Tuula Haataja
>> Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B
> 
> -- 
> Eike Ziller
> Principal Software Engineer
> 
> The Qt Company GmbH
> Rudower Chaussee 13, D-12489 Berlin
> Geschäftsführer: Mika Pälsi, Juha Varelius, Tuula Haataja
> Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B

-- 
Eike Ziller
Principal Software Engineer

The Qt Company GmbH
Rudower Chaussee 13, D-12489 Berlin
Geschäftsführer: Mika Pälsi, Juha Varelius, Tuula Haataja
Sitz der Gesellschaft: Berlin, Registergericht: Amtsgericht Charlottenburg, HRB 144331 B