D17088: [thumbnailer appimage] Fix building with libappimage not in system path

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added reviewers: broulik, TheAssassin, azubieta.
Herald added projects: Dolphin, Frameworks.
Herald added subscribers: kfm-devel, kde-frameworks-devel.
kossebau requested review of this revision.

REVISION SUMMARY
  The current CMake Config file of libappimage does not specify any
  imported target nameed "appimage". Instead it provides a shared lib
  target "libappimage" and a static lib target "libappimage_static".
  Both though are also broken in that they have targets to further
  dependencies in their link list, which though are only defined in the
  internal build system, but not provided with the installed CMake Config
  file.
  
  Additionally the LIBAPPIMAGE_INCLUDE_DIRS is currently not set,
  https://github.com/AppImage/libappimage/pull/17 hopefully fixes this
  for future versions.
  
  The previous simple "appimage" only worked if libappimage was installed
  to an otherwise known prefix, so include dirs and library paths were among
  the ones considered, and the linker would find libappimage via -lappimage.

TEST PLAN
  Building against current version of libappimage installed to custom prefix
  works, as well as building against the patched version.

REPOSITORY
  R320 KIO Extras

BRANCH
  fixappimagelinking

REVISION DETAIL
  https://phabricator.kde.org/D17088

AFFECTED FILES
  thumbnail/CMakeLists.txt

To: kossebau, broulik, TheAssassin, azubieta
Cc: kde-frameworks-devel, kfm-devel, alexde, sourabhboss, feverfew, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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