Review Request 112969: Try to compile a basic Qt application before checking for -fvisibility=hidden

[Casian Andrei]

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This is an automatically generated e-mail. To reply, visit:
http://git.reviewboard.kde.org/r/112969/
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(Updated Sept. 28, 2013, 8:16 a.m.)


Review request for Build System.


Changes
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Change branch to KDE/4.11, where it might still be useful in some rare corner case for a strange system...


Description (updated)
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If there is a problem with finding the Qt includes, then
FindKDE4Internal tells the user that Qt is not compiled correctly, and
it is not straight forward to realise that it is a false alarm.

Introduce a simple check for compiling a barebone Qt application before
attempting to check for -fvisibility=hidden. This way, the error message
states that Qt has not been found correctly, preventing confusion.


Update: I should have checked out the frameworks branch, not master... I was under the impression that it was merged into master :( . But perhaps this patch is still useful for KDE/4.11.

The error came from FindQt4 not finding the "Qt" include, which is not present with Qt5. Makes sense.


Diffs
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  cmake/modules/FindKDE4Internal.cmake 7922b09 

Diff: http://git.reviewboard.kde.org/r/112969/diff/


Testing
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When trying without these changes:
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-- Found Qt-Version 5.1.1 (using /usr/bin/qmake)
-- Building kdelibs...
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
QT_QT_INCLUDE_DIR
   used as include directory in directory /usr/local/src/kdesrc/build/kdelibs/CMakeFiles/CMakeTmp

CMake Error: Internal CMake error, TryCompile configure of cmake failed

CMake Error at cmake/modules/FindKDE4Internal.cmake:1294 (message):
  Qt compiled without support for -fvisibility=hidden.  This will break
  plugins and linking of some applications.  Please fix your Qt installation
  (try passing --reduce-exports to configure).
Call Stack (most recent call first):
  CMakeLists.txt:56 (find_package)
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Scary!

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When trying after these changes:
-- Found Qt-Version 5.1.1 (using /usr/bin/qmake)
-- Building kdelibs...
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
QT_QT_INCLUDE_DIR
   used as include directory in directory /usr/local/src/kdesrc/build/kdelibs/CMakeFiles/CMakeTmp

CMake Error: Internal CMake error, TryCompile configure of cmake failed

CMake Error at cmake/modules/FindKDE4Internal.cmake:1308 (message):
  Unable to compile a basic Qt application.  Qt has not been found correctly.
Call Stack (most recent call first):
  CMakeLists.txt:56 (find_package)
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Less scary :-)


Thanks,

Casian Andrei

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