D11921: CMake Server: Reuse existing build directory path when available

[Milian Wolff]

mwolff created this revision.
mwolff added reviewers: KDevelop, rjvbb.
Restricted Application added a subscriber: kdevelop-devel.
mwolff requested review of this revision.

REVISION SUMMARY
  When the build dir is accessible via multiple (symlinked) paths,
  we should reuse whatever the current CMakeCache is using. This
  ensures that we don't trigger a needless cache invalidation leading
  to a full project rebuild. E.g. I have:
  
  /home/milian/projects/kf5/src/frameworks/kdesu
  
  kdesrc-build will build this in:
  /home/milian/projects/kf5/build-dbg/frameworks/kdesu
  
  To enable quick build dir selection by kdevelop, I also
  created this symlink:
  /home/milian/projects/kf5/build -> /home/milian/projects/kf5/build-dbg
  
  Thus KDevelop is running the cmake server configuration job with
  this path instead of the one chosen by kdesrc-build above:
  /home/milian/projects/kf5/build/frameworks/kdesu
  
  In the end, this lead to me having to recompile every project after
  I ran kdesrc-build and opening the project in kdevelop...
  
  This patch looks up the existing CMAKE_CACHEFILE_DIR variable
  and reuses that if available. I.e. now KDevelop will actually use
  /home/milian/projects/kf5/build-dbg/frameworks/kdesu automatically,
  and I don't need to recompile everything all the time.

REPOSITORY
  R32 KDevelop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11921

AFFECTED FILES
  plugins/cmake/cmakeserver.cpp
  plugins/quickopen/tests/test_quickopen.cpp

To: mwolff, #kdevelop, rjvbb
Cc: kdevelop-devel
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