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# Finds a human readable version name for current repository revision based on available tags. Provided variable VAR
# will be set to contain found value.
function(git_describe VAR)
execute_process(
COMMAND git describe --tags HEAD
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
RESULT_VARIABLE DESCRIBE_RESULT
OUTPUT_VARIABLE DESCRIBE_OUTPUT
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(NOT DESCRIBE_RESULT)
set(${VAR} ${DESCRIBE_OUTPUT} PARENT_SCOPE)
else()
execute_process(
COMMAND git rev-parse --short HEAD
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
RESULT_VARIABLE PARSE_RESULT
OUTPUT_VARIABLE PARSE_OUTPUT
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(NOT PARSE_RESULT)
set(${VAR} "Unknown-g${PARSE_OUTPUT}" PARENT_SCOPE)
else()
set(${VAR} "Unknown" PARENT_SCOPE)
endif()
endif()
endfunction()
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