Review Request 110563: Crash fix: hide symbols from static lib QtUitools.a (generically by new macro KDE4_HIDE_SYMBOLS_FROM_STATIC_LIBS)

Friedrich W. H. Kossebau kossebau at
Wed Sep 17 20:36:29 BST 2014

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(Updated Sept. 17, 2014, 7:36 nachm.)


This change has been discarded.

Review request for Build System, kdelibs, Alexander Neundorf, and Thiago Macieira.

Repository: kdelibs


Like discussed in the thread "Crashes with libQtUiTools.a if linked multiple times into the same process (with Bsymbolic-functions flag)" on kde-core-devel ( ) symbols from QtUitools.a are not hidden by default in Qt4 and thus will be added to the public symbols of the module/shared lib they are linked to. And thus can appear multiple times in the same process, resulting in symbol clashes and leading to problems at least with the Bsymbolic-functions flag or when being possibly incompatible versions.

Attached patch sees to solve that problem, by adding a macro KDE4_HIDE_SYMBOLS_FROM_STATIC_LIBS which should add any needed linker flags depending on the platform/linker used. 

Only issue is that instead of some variable I had to use "QtUiTools.a" as I found no variable which would resolve to that. E.g. ${QT_QTUITOOLS_LIBRARY} resolves to "Qt4::QtUiTools" for me. Any idea what to use there, in case another platform needs another name/prefix here?

Patch is against 4.10 branch, so I hope to get this in 4.10.4 shows that there are some more places where the symbols need hiding, but I first want feedback on the proposed approach.


  cmake/modules/FindKDE4Internal.cmake cb63285 
  cmake/modules/KDE4Macros.cmake 3db4e24 
  kjsembed/kjsembed/CMakeLists.txt d70f260 
  kross/modules/CMakeLists.txt d245fd8 
  kross/qts/CMakeLists.txt d8cb4a5 
  plasma/CMakeLists.txt 674550d 




Friedrich W. H. Kossebau

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