diff options
Diffstat (limited to 'cmake/modules/TableGen.cmake')
| -rw-r--r-- | cmake/modules/TableGen.cmake | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/cmake/modules/TableGen.cmake b/cmake/modules/TableGen.cmake index cf7cd1f..e61a342 100644 --- a/cmake/modules/TableGen.cmake +++ b/cmake/modules/TableGen.cmake @@ -12,14 +12,25 @@ macro(tablegen ofn) set(LLVM_TARGET_DEFINITIONS_ABSOLUTE ${CMAKE_CURRENT_SOURCE_DIR}/${LLVM_TARGET_DEFINITIONS}) endif() - add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn} + add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp + # Generate tablegen output in a temporary file. COMMAND ${LLVM_TABLEGEN_EXE} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR} -I ${LLVM_MAIN_SRC_DIR}/lib/Target -I ${LLVM_MAIN_INCLUDE_DIR} ${LLVM_TARGET_DEFINITIONS_ABSOLUTE} - -o ${CMAKE_CURRENT_BINARY_DIR}/${ofn} + -o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp DEPENDS tblgen ${local_tds} ${global_tds} COMMENT "Building ${ofn}..." ) + add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn} + # Only update the real output file if there are any differences. + # This prevents recompilation of all the files depending on it if there + # aren't any. + COMMAND ${CMAKE_COMMAND} -E copy_if_different + ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp + ${CMAKE_CURRENT_BINARY_DIR}/${ofn} + DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp + COMMENT "" + ) set(TABLEGEN_OUTPUT ${TABLEGEN_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR}/${ofn}) set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${ofn} PROPERTIES GENERATED 1) |