[Kde-hardware-devel] libnm-qt Qt5 port: -fPIC or fPIE needed?

[Daniel Nicoletti]

I have added this to some of my qt5 projects and it worked:

add_definitions(-fPIC)

2013/10/9 Sebastian Kügler <sebas at kde.org>:
> Hi,
>
> While porting libnm-qt to Qt5, I'm running into the following problem when
> building the tests. I've not seen this error before, and I'd like advice how
> to fix it.
>
> [ 59%] Building CXX object
> tests/CMakeFiles/test_8021xsetting.dir/8021xsetting.cpp.o
> In file included from /home/sebas/kf5/qt5/qtbase/include/QtCore/qglobal.h:1:0,
>                  from
> /home/sebas/kf5/qt5/qtbase/include/QtCore/../../src/corelib/global/qnamespace.h:45,
>                  from
> /home/sebas/kf5/qt5/qtbase/include/QtCore/qnamespace.h:1,
>                  from
> /home/sebas/kf5/qt5/qtbase/include/QtCore/../../src/corelib/kernel/qobjectdefs.h:45,
>                  from
> /home/sebas/kf5/qt5/qtbase/include/QtCore/qobjectdefs.h:1,
>                  from
> /home/sebas/kf5/qt5/qtbase/include/QtCore/../../src/corelib/kernel/qobject.h:48,
>                  from /home/sebas/kf5/qt5/qtbase/include/QtCore/qobject.h:1,
>                  from /home/sebas/kf5/qt5/qtbase/include/QtCore/QObject:1,
>                  from /home/sebas/kf5/src/libnm-qt/tests/8021xsetting.h:24,
>                  from /home/sebas/kf5/src/libnm-qt/tests/8021xsetting.cpp:21:
> /home/sebas/kf5/qt5/qtbase/include/QtCore/../../src/corelib/global/qglobal.h:991:4:
> error: #error "You must build your code with position independent code if Qt
> was built with -reduce-relocations. " "Compile your code with -fPIC or -fPIE."
> make[2]: *** [tests/CMakeFiles/test_8021xsetting.dir/8021xsetting.cpp.o] Error
> 1
>
> This error comes up for a whole slew of tests. I've tried adding "-fpie" and
> "PIE" to the CMAKE_EXE_LINKER_FLAGS (also tried CMAKE_LIBRARY_LINKER_FLAGS) by
> just setting this variable, but to no avail. The rest of libnm-qt builds fine.
>
> Could anyone give me a hint how to fix this?
>
> Code is in the qt5 branch of libnm-qt.
>
> Cheers,
> --
> sebas
>
> http://www.kde.org | http://vizZzion.org | GPG Key ID: 9119 0EF9
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-- 
Daniel Nicoletti

KDE Developer - http://dantti.wordpress.com