set(get_svn_script "${LLVM_CMAKE_PATH}/GenerateVersionFromCVS.cmake")
-file(WRITE "${version_inc}.empty" "")
+file(WRITE "${version_inc}.undef" "#undef LLVM_REVISION\n")
if((DEFINED llvm_vc) AND LLVM_APPEND_VC_REV)
execute_process(COMMAND ${CMAKE_COMMAND} -E compare_files
- "${version_inc}.empty" "${version_inc}"
+ "${version_inc}.undef" "${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.
+ # Remove ${version_inc} if it doesn't define a revision. This will force it
+ # to be regenerated when toggling LLVM_APPEND_VC_REV from OFF to ON.
if(NOT files_not_equal)
file(REMOVE "${version_inc}")
endif()
"-DHEADER_FILE=${version_inc}"
-P "${get_svn_script}")
else()
- # Make sure ${version_inc} is an empty file.
+ # Make sure ${version_inc} doesn't define a revision
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
- "${version_inc}.empty" "${version_inc}")
+ "${version_inc}.undef" "${version_inc}")
endif()
-file(REMOVE "${version_inc}.empty")
+file(REMOVE "${version_inc}.undef")
# Mark the generated header as being generated.
set_source_files_properties("${version_inc}"