[Differential] [Request, 36 lines] D3358: Set RPATH to custom dirs of own and foreign libs; no linking to build dir

[kossebau (Friedrich W. H. Kossebau)]

kossebau created this revision.
kossebau added reviewers: Marble, rahn, nienhueser, shentey.

REVISION SUMMARY
  When installing marble to a non-standard system directory
  the executable loader needs to be informed about the location of the
  marble libraries. Until now for marble executables this needs to be done
  via the env var LD_LIBRARY_PATH, which has the disadvantage of needing
  to be done as explicit separate step and also affects other executables
  which see this env var.
  Instead the custom locations of linked libraries can be tagged within
  the executable, via the RPATH (or RUNPATH) entries, which then is
  automatically available and also only valid for the given executable.
  
  Libmarblewidget only works with data & plugins in installation folders.
  So when running executables from the build dir (apps, tools, tests)
  linked to libraries from the build dir, for one things might not work
  due to not yet installed data/plugins. Or there are API/ABI-related
  changes done but without reinstallation, so installed plugins and
  libraries in the build dir are incompatible and will fail with
  strange behaviour.
  To protect against that some more when linking the executables
  in the build dir the RPATH can be set already to the installation
  location only, so the versions of the libraries in the build dir
  will not be seen and at least libraries and plugins are consistent.
  
  More info e.g. here:
  https://cmake.org/Wiki/CMake_RPATH_handling
  http://tldp.org/HOWTO/Program-Library-HOWTO/shared-libraries.html

REPOSITORY
  rMARBLE Marble

BRANCH
  useRPathWithApps

REVISION DETAIL
  https://phabricator.kde.org/D3358

AFFECTED FILES
  CMakeLists.txt
  MarbleMacros.cmake
  src/lib/marble/declarative/CMakeLists.txt

EMAIL PREFERENCES
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To: kossebau, #marble, rahn, nienhueser, shentey
Cc: marble-devel
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