D15895: Use CLANG_INCLUDE_DIRS for clang include dir

[Bernd Buschinski]

buschinski created this revision.
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REVISION SUMMARY
  Use CLANG_INCLUDE_DIRS for clang include dir instead of manually building it.
  
  This fixes the error:
  kdevplatform.shell: Could not load plugin "kdevclangsupport" , it reported the error: "The clang builtin include path \"/usr/lib64/llvm/7/lib64/clang/7.0.0/include\" is invalid (missing cpuid.h header).\nTry setting the KDEV_CLANG_BUILTIN_DIR environment variable manually to fix this.\nSee also: https://bugs.kde.org/show_bug.cgi?id=393779" Disabling the plugin now.
  
  As CMake with CLANG_INCLUDE_DIRS already tests if this folder is present, it should work across all distros.
  
  BUG: 393779

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D15895

AFFECTED FILES
  plugins/clang/libclang_include_path.h.cmake

To: buschinski, #kdevelop
Cc: kdevelop-devel, glebaccon, antismap, iodelay, vbspam, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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