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set(TEMPLATE_FILE "${CMAKE_CURRENT_SOURCE_DIR}/scripts/build-info.h.in")
set(HEADER_FILE "${CMAKE_CURRENT_SOURCE_DIR}/build-info.h")
set(BUILD_NUMBER 0)
set(BUILD_COMMIT "unknown")
# Look for git
find_package(Git)
if(NOT Git_FOUND)
execute_process(
COMMAND which git
OUTPUT_VARIABLE GIT_EXECUTABLE
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(NOT GIT_EXECUTABLE STREQUAL "")
set(Git_FOUND TRUE)
message(STATUS "Found Git using 'which': ${GIT_EXECUTABLE}")
else()
message(WARNING "Git not found using 'find_package' or 'which'. Build info will not be accurate. Consider installing Git or ensuring it is in the PATH.")
endif()
endif()
# Get the commit count and hash
if(Git_FOUND)
execute_process(
COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
OUTPUT_VARIABLE HEAD
OUTPUT_STRIP_TRAILING_WHITESPACE
RESULT_VARIABLE GIT_HEAD_RESULT
)
execute_process(
COMMAND ${GIT_EXECUTABLE} rev-list --count HEAD
WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
OUTPUT_VARIABLE COUNT
OUTPUT_STRIP_TRAILING_WHITESPACE
RESULT_VARIABLE GIT_COUNT_RESULT
)
if(GIT_HEAD_RESULT EQUAL 0 AND GIT_COUNT_RESULT EQUAL 0)
set(BUILD_COMMIT ${HEAD})
set(BUILD_NUMBER ${COUNT})
endif()
endif()
# Only write the header if it's changed to prevent unnecessary recompilation
if(EXISTS ${HEADER_FILE})
file(STRINGS ${HEADER_FILE} CONTENTS REGEX "BUILD_COMMIT \"([^\"]*)\"")
list(GET CONTENTS 0 EXISTING)
if(NOT EXISTING STREQUAL "#define BUILD_COMMIT \"${BUILD_COMMIT}\"")
configure_file(${TEMPLATE_FILE} ${HEADER_FILE})
endif()
else()
configure_file(${TEMPLATE_FILE} ${HEADER_FILE})
endif()
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