https://bugs.kde.org/show_bug.cgi?id=452125
Bug ID: 452125
Summary: Specifying LLVM_DIR causes Clang not to be found.
Product: kdevelop
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Build tools: CMake
Assignee: kdevelop-bugs-n...@kde.org
Reporter: bunge...@gmail.com
Target Milestone: ---
SUMMARY
I am on a system where clang-12 is the default but wish to build KDevelop
against clang-13. I can install clang-13 and its dev packages, and set
`cmake-options -DLLVM_DIR=/usr/lib/llvm-13` in my `~/.kdesrc-buildrc`. This
allows llvm-13 to be found, but the cmake build steps fail to find the clang-13
libraries. The issue appears to be that in `cmake/modules/FindClang.cmake` if
`LLVM_DIR` is set `find_package(LLVM ${version})` is not executed at all, which
means that none of its side effects are made available (like setting
(LLVM_FOUND, LLVM_LIBRARY_DIRS, etc). Simply removing `LLVM_DIR OR ` from this
file allows the correct clang-13 libraries to be found and the build succeeds.
STEPS TO REPRODUCE
1. Set `cmake-options -DLLVM_DIR=/usr/lib/llvm-13` in `~/.kdesrc-buildrc`, or
otherwise get LLVM_DIR to CMake.
2. Run CMake.
OBSERVED RESULT
CMake finds LLVM fine, but then fails to find Clang libraries.
EXPECTED RESULT
CMake should find the Clang libraries.
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