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CMake: Search for Clang in CMAKE_LIBRARY_PATH, CMAKE_PREFIX_PATH, and CMAKE_FRAMEWORK_PATH

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On some systems (esp. systems that use unique hashed file-paths for
library-versions like Nix), we can't expect LLVM and Clang to share
lib/bin directories.

The best we can do is find the matching clang libraries in the
CMAKE_LIBRARY_PATH provided by the environment
This commit is contained in:
Cody Tapscott 2022-07-25 10:29:38 -07:00
parent 5337934bcd
commit abc1ae538f
1 changed files with 9 additions and 3 deletions
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12
cmake/Findclang.cmake
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@ -9,7 +9,9 @@
find_path(CLANG_INCLUDE_DIRS NAMES clang/Frontend/ASTUnit.h
HINTS ${LLVM_INCLUDE_DIRS}
NO_DEFAULT_PATH # Only look for clang next to LLVM
# Only look for Clang next to LLVM or in { CMAKE_PREFIX_PATH, CMAKE_LIBRARY_PATH, CMAKE_FRAMEWORK_PATH }
NO_SYSTEM_ENVIRONMENT_PATH
NO_CMAKE_SYSTEM_PATH
)
if(${LLVM_LINK_MODE} STREQUAL "shared")
@ -21,14 +23,18 @@ if(${LLVM_LINK_MODE} STREQUAL "shared")
clang-cpp
NAMES_PER_DIR
HINTS "${LLVM_LIBDIRS}"
NO_DEFAULT_PATH # Only look for Clang next to LLVM
# Only look for Clang next to LLVM or in { CMAKE_PREFIX_PATH, CMAKE_LIBRARY_PATH, CMAKE_FRAMEWORK_PATH }
NO_SYSTEM_ENVIRONMENT_PATH
NO_CMAKE_SYSTEM_PATH
)
else()
macro(FIND_AND_ADD_CLANG_LIB _libname_)
string(TOUPPER ${_libname_} _prettylibname_)
find_library(CLANG_${_prettylibname_}_LIB NAMES ${_libname_} NAMES_PER_DIR
HINTS "${LLVM_LIBDIRS}"
NO_DEFAULT_PATH # Only look for Clang next to LLVM
# Only look for Clang next to LLVM or in { CMAKE_PREFIX_PATH, CMAKE_LIBRARY_PATH, CMAKE_FRAMEWORK_PATH }
NO_SYSTEM_ENVIRONMENT_PATH
NO_CMAKE_SYSTEM_PATH
)
if(CLANG_${_prettylibname_}_LIB)
set(CLANG_LIBRARIES ${CLANG_LIBRARIES} ${CLANG_${_prettylibname_}_LIB})