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version.cmake
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version.cmake
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# set default file name
if (NOT "${GIT_REV_FILE}")
set (GIT_REV_FILE "${CMAKE_CURRENT_LIST_DIR}/src/git_rev.c")
endif ()
# get full commit hash
execute_process (
COMMAND git rev-parse HEAD
OUTPUT_VARIABLE GIT_REV_FULL
ERROR_QUIET
)
if (GIT_REV_FULL)
# abbreviate hash to 7 nibbles
string (SUBSTRING "${GIT_REV_FULL}" 0 7 GIT_REV)
# append '+' if there are modifications
execute_process (
COMMAND git diff --quiet --exit-code
RESULT_VARIABLE IS_MODIFIED
)
if (IS_MODIFIED)
set (GIT_REV "${GIT_REV}+")
endif ()
# report version on the console
message (STATUS "Git revision: ${GIT_REV}")
# get the branch (if there's any)
execute_process (
COMMAND git rev-parse --abbrev-ref HEAD
OUTPUT_VARIABLE GIT_BRANCH
)
if (NOT "${GIT_BRANCH}" STREQUAL "${GIT_REV_FULL}")
string (STRIP "${GIT_BRANCH}" GIT_BRANCH)
set (GIT_BRANCH "\"${GIT_BRANCH}\"") # convert to C string
else ()
set (GIT_BRANCH "0")
endif ()
# set the final file contents
set (FILE_CONTENTS "// this file is auto-generated, don't edit it
const char* git_rev = \"${GIT_REV}\";
const char* git_branch = ${GIT_BRANCH};
")
else ()
# fallback if the initial Git query failed
message (STATUS "not a Git checkout")
set (FILE_CONTENTS "// not a Git checkout
const char* git_rev = nullptr;
const char* git_branch = nullptr;
")
endif ()
# read original file contents
if (EXISTS "${GIT_REV_FILE}")
file (READ "${GIT_REV_FILE}" OLD_CONTENTS)
else ()
set (OLD_CONTENTS "xxx")
endif ()
# replace file with new contents
if (NOT "${FILE_CONTENTS}" STREQUAL "{OLD_CONTENTS}")
file (WRITE "${GIT_REV_FILE}" "${FILE_CONTENTS}")
endif ()