http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58678
--- Comment #39 from David Kredba <nheghathivhistha at gmail dot com> --- Hello Markus, Thank you. Without LTO the reference is different, maybe qHash would be the next one error. MakeFiles/kritametadataeditor.dir/kis_meta_data_editor.cc.o: In function `KisMetaDataEditor::KisMetaDataEditor(QWidget*, KisMetaData::Store*)': /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/krita/plugins/extensions/metadataeditor/kis_meta_data_editor.cc:79: undefined reference to `QUiLoader::QUiLoader(QObject*)' /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/krita/plugins/extensions/metadataeditor/kis_meta_data_editor.cc:82: undefined reference to `QUiLoader::load(QIODevice*, QWidget*)' /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/krita/plugins/extensions/metadataeditor/kis_meta_data_editor.cc:85: undefined reference to `QUiLoader::~QUiLoader()' /var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0/krita/plugins/extensions/metadataeditor/kis_meta_data_editor.cc:79: undefined reference to `QUiLoader::~QUiLoader()' collect2: error: ld returned 1 exit status krita/plugins/extensions/metadataeditor/CMakeFiles/kritametadataeditor.dir/build.make:229: recipe for target 'lib/kritametadataeditor.so' failed It wanted to link this way: /usr/bin/x86_64-pc-linux-gnu-g++ -fPIC -flto=4 -fuse-linker-plugin -O2 -ggdb -pipe -march=native -mtune=native -mno-3dnow -mno-sse4.2 -mno-avx -fno-lto -fno-use-linker-plugin -Wnon-virtual-dtor -Wno-long-long -Wundef -Wcast-align -Wchar-subscripts -Wall -W -Wpointer-arith -Wformat-security -fno-exceptions -DQT_NO_EXCEPTIONS -fno-check-new -fno-common -Woverloaded-virtual -fno-threadsafe-statics -fvisibility=hidden -fvisibility-inlines-hidden -march=core2 -msse2 -msse3 -mssse3 -msse4.1 -mno-sse4.2 -mno-sse4a -mno-avx -mno-xop -mno-fma4 -Wabi -fabi-version=0 -ffp-contract=fast -fexceptions -UQT_NO_EXCEPTIONS -Wl,--enable-new-dtags -Wl,--no-undefined -lc -flto=4 -fuse-linker-plugin -Wl,--as-needed -Wl,-O2 -Wl,-flto -O2 -ggdb -pipe -march=native -mtune=native -mno-3dnow -mno-sse4.2 -mno-avx -fno-lto -fno-use-linker-plugin -shared -Wl,-soname,kritametadataeditor.so -o ../../../../lib/kritametadataeditor.so CMakeFiles/kritametadataeditor.dir/kritametadataeditor_automoc.cpp.o CMakeFiles/kritametadataeditor.dir/metadataeditor.cc.o CMakeFiles/kritametadataeditor.dir/kis_entry_editor.cc.o CMakeFiles/kritametadataeditor.dir/kis_meta_data_editor.cc.o CMakeFiles/kritametadataeditor.dir/kis_meta_data_model.cpp.o -L/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0_build/lib -L/usr/lib64/qt4 ../../../../lib/libkritaui.so.13.0.0 /usr/lib64/qt4/libQtUiTools.a ../../../../lib/libkritaimage.so.13.0.0 ../../../../lib/libkomain.so.13.0.0 /usr/lib64/libkactivities.so.6.2.0 -lGLU -lGL -lSM -lICE -lSM -lICE -lX11 -lXext -lXft -lXau -lXdmcp -lXpm /usr/lib64/qt4/libQtOpenGL.so ../../../../lib/libkowidgets.so.13.0.0 ../../../../lib/libkotext.so.13.0.0 ../../../../lib/libflake.so.13.0.0 ../../../../lib/libpigmentcms.so.13.0.0 ../../../../lib/libkoplugin.so.13.0.0 -lImath -lIlmImf -lIex -lHalf -lIlmThread -Wl,-Bstatic -lVc -Wl,-Bdynamic ../../../../lib/libkundo2.so.13.0.0 ../../../../lib/libkowidgetutils.so.13.0.0 ../../../../lib/libkoodf.so.13.0.0 /usr/lib64/libkio.so.5.12.3 /usr/lib64/qt4/libQtXml.so /usr/lib64/qt4/libQtNetwork.so /usr/lib64/libkdeui.so.5.12.3 /usr/lib64/qt4/libQtGui.so /usr/lib64/qt4/libQtSvg.so /usr/lib64/libkdecore.so.5.12.3 /usr/lib64/qt4/libQtDBus.so /usr/lib64/qt4/libQtCore.so -lpthread -Wl,-rpath,/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0_build/lib:/usr/lib64/qt4: -Wl,-rpath-link,/var/tmp/portage/app-office/calligra-2.8.0/work/calligra-2.8.0_build/lib
