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macro(ClangVersion path version_major version_minor)
if(EXISTS "${path}/clang/Basic/Version.inc")
file(READ "${path}/clang/Basic/Version.inc" CLANG_VERSION_DATA)
string(REGEX REPLACE ";" "\\\\;" CLANG_VERSION_DATA ${CLANG_VERSION_DATA})
string(REGEX REPLACE "\n" ";" CLANG_VERSION_DATA ${CLANG_VERSION_DATA})
foreach(line ${CLANG_VERSION_DATA})
string(REGEX REPLACE "^#define CLANG_VERSION ([0-9]+\\.[0-9]+)$" "\\1" CLANG_VERSION_STRING ${line})
if(DEFINED CLANG_VERSION_STRING)
string(REGEX REPLACE "^([0-9]+)\\.[0-9]+$" "\\1" CLANG_VERSION_MAJOR ${CLANG_VERSION_STRING})
string(REGEX REPLACE "^[0-9]+\\.([0-9]+)$" "\\1" CLANG_VERSION_MINOR ${CLANG_VERSION_STRING})
if(NOT ${CLANG_VERSION_MAJOR} STREQUAL "" AND NOT ${CLANG_VERSION_MINOR} STREQUAL "")
break()
endif()
endif()
endforeach()
endif()
if(NOT ${CLANG_VERSION_MAJOR} STREQUAL "" AND NOT ${CLANG_VERSION_MINOR} STREQUAL "")
set(${version_major} ${CLANG_VERSION_MAJOR})
set(${version_minor} ${CLANG_VERSION_MINOR})
else()
message(FATAL_ERROR "Unable to parse ClangVersion from ${path}/clang/Basic/Version.inc")
endif()
endmacro()
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