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find_program(GIT_EXECUTABLE git DOC "path to the git executable")
mark_as_advanced(GIT_EXECUTABLE)
function(git_version RESULT_VAR DIR)
set(${RESULT_VAR} "" PARENT_SCOPE)
if(GIT_EXECUTABLE)
execute_process(COMMAND ${GIT_EXECUTABLE} describe WORKING_DIRECTORY ${DIR} OUTPUT_VARIABLE git_version_OUTPUT ERROR_VARIABLE git_version_ERROR RESULT_VARIABLE git_version_RESULT OUTPUT_STRIP_TRAILING_WHITESPACE)
if(${git_version_RESULT} EQUAL 0)
set(${RESULT_VAR} "${git_version_OUTPUT}" PARENT_SCOPE)
endif()
endif()
endfunction(git_version)
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