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find_first_existing_vc_file(llvm_vc "${LLVM_MAIN_SRC_DIR}")
# The VC revision include that we want to generate.
set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSRevision.h")
set(get_svn_script "${LLVM_CMAKE_PATH}/GenerateVersionFromCVS.cmake")
file(WRITE "${version_inc}.empty" "")
if((DEFINED llvm_vc) AND LLVM_APPEND_VC_REV)
execute_process(COMMAND ${CMAKE_COMMAND} -E compare_files
"${version_inc}.empty" "${version_inc}"
RESULT_VARIABLE files_not_equal
OUTPUT_QUIET
ERROR_QUIET)
# Remove ${version_inc} if it's empty -- toggling LLVM_APPEND_VC_REV
# from OFF to ON.
if(NOT files_not_equal)
file(REMOVE "${version_inc}")
endif()
# Create custom target to generate the VC revision include.
add_custom_command(OUTPUT "${version_inc}"
DEPENDS "${llvm_vc}" "${get_svn_script}"
COMMAND
${CMAKE_COMMAND} "-DSOURCE_DIR=${LLVM_MAIN_SRC_DIR}"
"-DNAME=LLVM_REVISION"
"-DHEADER_FILE=${version_inc}"
-P "${get_svn_script}")
else()
# Make sure ${version_inc} is an empty file.
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
"${version_inc}.empty" "${version_inc}")
endif()
file(REMOVE "${version_inc}.empty")
# Mark the generated header as being generated.
set_source_files_properties("${version_inc}"
PROPERTIES GENERATED TRUE
HEADER_FILE_ONLY TRUE)
add_custom_target(llvm_vcsrevision_h DEPENDS "${version_inc}")
set_target_properties(llvm_vcsrevision_h PROPERTIES FOLDER "Misc")
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