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# Using the CMake tools to create the gitversion.hpp, which just contains
# the implementation of GetVersion() assuming that we are working inside of a
# git repository.
find_package(Git)
execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
OUTPUT_VARIABLE NEW_GIT_REVISION
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Get the current version, if it exists.
if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/src/mlpack/core/util/gitversion.hpp)
file(READ ${CMAKE_CURRENT_SOURCE_DIR}/src/mlpack/core/util/gitversion.hpp
_OLD_GITVERSION_CONTENTS)
string(REGEX REPLACE ".*return \"mlpack git-([0-9a-f]+)\".*" "\\1"
OLD_GIT_REVISION ${_OLD_GITVERSION_CONTENTS})
else()
set(OLD_GIT_REVISION "notfound")
endif()
if("${OLD_GIT_REVISION}" STREQUAL "${NEW_GIT_REVISION}")
message(STATUS "gitversion.hpp is already up to date.")
else()
# Remove the old version.
file(REMOVE ${CMAKE_CURRENT_SOURCE_DIR}/src/mlpack/core/util/gitversion.hpp)
file(WRITE ${CMAKE_CURRENT_SOURCE_DIR}/src/mlpack/core/util/gitversion.hpp
"return \"mlpack git-${NEW_GIT_REVISION}\";\n")
message(STATUS "Updated gitversion.hpp.")
endif()
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