GitRepoTag.cmake

set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${CMAKE_SOURCE_DIR}/.git)

execute_process(COMMAND git rev-parse -q HEAD
    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
    OUTPUT_VARIABLE GIT_SHA
    RESULT_VARIABLE GIT_SHA_RET
    OUTPUT_STRIP_TRAILING_WHITESPACE)

if(NOT ${GIT_SHA_RET})

    execute_process(COMMAND git describe --tags HEAD
	WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
        OUTPUT_VARIABLE GIT_TAGNAME
        OUTPUT_STRIP_TRAILING_WHITESPACE)
    execute_process(COMMAND sh -c "basename `git rev-parse --show-toplevel`"
        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
        OUTPUT_VARIABLE REPO_NAME
        OUTPUT_STRIP_TRAILING_WHITESPACE)

    SET(CODEVERSION_COMPILE_DEFS "REPO_NAME=${REPO_NAME};REPO_VERSION=${GIT_SHA};REPO_TAGNAME=${GIT_TAGNAME}")
    message(STATUS "git repo ${REPO_NAME} tag '${GIT_TAGNAME}' (SHA ${GIT_SHA})")

else()

    message(WARNING "Project source directory not tracked by version control")
    SET(CODEVERSION_COMPILE_DEFS "REPO_NAME=untracked;REPO_VERSION=unversioned;REPO_TAGNAME=untagged")

endif()