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# get clang resource directory
#
# usage:
# get_clang_resource_dir(out_var [PREFIX prefix] [SUBDIR subdirectory])
#
# user can use `PREFIX` to prepend some path to it or use `SUBDIR` to
# get subdirectory under clang resource dir
function(get_clang_resource_dir out_var)
cmake_parse_arguments(ARG "" "PREFIX;SUBDIR" "" ${ARGN})
if(DEFINED CLANG_RESOURCE_DIR AND NOT CLANG_RESOURCE_DIR STREQUAL "")
set(ret_dir bin/${CLANG_RESOURCE_DIR})
else()
if (NOT CLANG_VERSION_MAJOR)
string(REGEX MATCH "^[0-9]+" CLANG_VERSION_MAJOR ${PACKAGE_VERSION})
endif()
set(ret_dir lib${LLVM_LIBDIR_SUFFIX}/clang/${CLANG_VERSION_MAJOR})
endif()
if(ARG_PREFIX)
set(ret_dir ${ARG_PREFIX}/${ret_dir})
endif()
if(ARG_SUBDIR)
set(ret_dir ${ret_dir}/${ARG_SUBDIR})
endif()
set(${out_var} ${ret_dir} PARENT_SCOPE)
endfunction()
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