KConfig issues prevent compiling KDE applications under Windows

[Jasem Mutlaq]

This is from GIT master. Problem still exists, but I could try disabling
unit tests and continue. I hope it gets fixed anyway soon so that other
users wouldn't run into the same problem.

On Fri, Feb 3, 2017 at 12:08 AM, Jaroslaw Staniek <staniek at kde.org> wrote:

>
>
> On 1 February 2017 at 14:34, David Faure <faure at kde.org> wrote:
>
>> On mardi 31 janvier 2017 07:58:15 CET Jasem Mutlaq wrote:
>> > Hello,
>> >
>> > KConfig used to work perfectly fine under Windows. I recently tried to
>> > compile KStars under Windows 10 (64bit) with MSVC 2015 and Qt 5.8 using
>> > Craft, but encountered an issue as explained in this bug report:
>> >
>> > https://bugs.kde.org/show_bug.cgi?id=
>> ​​
>> 375654 <https://bugs.kde.org/show_bug.cgi?id=375654>
>> >
>> > I talked with Craft maintainers (Hannah et al) and they told me this
>> was an
>> > issue from KConfig side, not Craft. Can someone please look into this
>> and
>> > fix it as it our release is dependent on this.
>>
>> KF5ConfigCore.lib(KF5ConfigCore.dll) : error LNK2005: "public: class
>> QMap<struct
>> KEntryKey,struct KEntry>::iterator __cdecl KEntryMap::findEntry(class
>> QByteArray const &,class QByteArray const &,class QFlags<enum
>> KEntryMap::SearchFlag>)" (?findEntry at KEntryMap@@QEAA?AVite
>> rator@?$QMap at UKEntryKey@@UKEntry@@@@AEBVQByteArray@@0V?
>> $QFlags at W4SearchFlag@KEntryMap@@@@@Z)
>> already defined in kconfigdata.cpp.obj
>>
>> Thanks MSVC for a very readable error message as always ;)
>>
>> One note though: this is a failure to link a unittest, your release isn't
>> blocked, you can just disable the building of unittests in kconfig.
>>
>> The double definition can be explained, the unittest links to
>> KF5ConfigCore
>> and then also compiles in ../src/core/kconfigdata.cpp because that class
>> is not
>> exported.
>
>
> Hi,
> Apparently it is since eab822e20620 (Jan 15).
> ​The bug #​375654 does not seem to provide version info but the fix isn't
> just released, right? CC'd Stephen Kelly.
>
> I don't see much to blame MSVS for here, even the message is rather clear:
> the binary being linked (not compiled) already contains the symbol.
> I'd avoid hacks such as (kconfig/autotests/CMakeLists.txt):
>
> set(kentrymaptest_SRCS kentrymaptest.cpp ../src/core/kconfigdata.cpp)
>
> Now since eab822e20620 the class is exported and all the other symbols are
> inline so the hack isn't needed. Anyone, feel free make a general fix.
>
> PS: The topic isn't linker-dependent, just the Microsoft's linker
> demonstrated consequences of the hack.
> Going further for quality, exporting just for test is suboptimal so it's a
> good practice to export only for tests this way by using special macros:
>
> Calligra for many years: https://api.kde.org/bundled-ap
> ps-api/calligra-apidocs/libs/main/html/komain__export_8h_source.html
>
> KDb: https://cgit.kde.org/kdb.git/tree/src/config-kdb.h.cmake#n43
>
> I'd recommend this not just for frameworks (or do we have this in ECM
> already?).
> Obviously CMake's generate_export_header() does not support it but IMHO it
> would.
> Then the extra cmake conditions would not be needed.
>
> ​So maybe that would be even better fix for KConfigData tests.​
>
>
>
>> This is something we do in quite a number of other places too,
>> always for autotests.
>>
>> kde-windows people, if you confirm there is no way to make this work
>> (some linker flag maybe?), then I do see one solution: the one used by Qt
>> (and
>> konqueror), which is an export macro that only exports the class when
>> compilation of autotests is enabled. See konqueror/src/konqprivate_expo
>> rt.h
>> for an example.
>>
>> --
>> David Faure, faure at kde.org, http://www.davidfaure.fr
>> Working on KDE Frameworks 5
>>
>>
>
>
> --
> regards, Jaroslaw Staniek
>
> KDE:
> : A world-wide network of software engineers, artists, writers, translators
> : and facilitators committed to Free Software development - http://kde.org
> Calligra Suite:
> : A graphic art and office suite - http://calligra.org
> Kexi:
> : A visual database apps builder - http://calligra.org/kexi
> Qt Certified Specialist:
> : http://www.linkedin.com/in/jstaniek
>



-- 
Best Regards,
Jasem Mutlaq
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