looking-glass/version.cmake

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CMake
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if (EXISTS ${PROJECT_TOP}/VERSION)
file(READ ${PROJECT_TOP}/VERSION GIT_REV)
else()
execute_process(
# Synchronize docs/lgrelease.py if updated
COMMAND git describe --always --abbrev=10 --dirty=+ --tags
WORKING_DIRECTORY "${PROJECT_TOP}"
OUTPUT_VARIABLE GIT_REV
ERROR_QUIET)
endif()
if ("${GIT_REV}" STREQUAL "")
set(GIT_REV "UNKNOWN")
endif()
string(STRIP "${GIT_REV}" GIT_VERSION)
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set(BUILD_VERSION "const char * BUILD_VERSION = \"${GIT_VERSION}\";")
string(TIMESTAMP YEAR "%Y")
set(HEADER "\
#define LG_VERSION_STR \"${GIT_VERSION}\"\n\
#define LG_CURRENT_YEAR ${YEAR}\n")
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if(EXISTS "${CMAKE_BINARY_DIR}/version.c")
file(READ ${CMAKE_BINARY_DIR}/version.c BUILD_VERSION_)
else()
set(BUILD_VERSION_ "")
endif()
if (NOT "${BUILD_VERSION}" STREQUAL "${BUILD_VERSION_}")
file(WRITE ${CMAKE_BINARY_DIR}/version.c "${BUILD_VERSION}")
file(WRITE ${CMAKE_BINARY_DIR}/VERSION "${GIT_VERSION}")
file(WRITE ${CMAKE_BINARY_DIR}/include/version.h "${HEADER}")
endif()