diff options
| -rw-r--r-- | clang/tools/driver/CMakeLists.txt | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/clang/tools/driver/CMakeLists.txt b/clang/tools/driver/CMakeLists.txt index e03b3fa3951..0d9a55b2b44 100644 --- a/clang/tools/driver/CMakeLists.txt +++ b/clang/tools/driver/CMakeLists.txt @@ -101,8 +101,15 @@ if(LD64_EXECUTABLE AND CLANG_ORDER_FILE) # This is a test to ensure the actual order file works with the linker. check_linker_flag("-Wl,-order_file,${CLANG_ORDER_FILE}" LINKER_ORDER_FILE_WORKS) - - if(LINKER_ORDER_FILE_WORKS) + + # Passing an empty order file disables some linker layout optimizations. + # To work around this and enable workflows for re-linking when the order file + # changes we check during configuration if the file is empty, and make it a + # configuration dependency. + file(READ ${CLANG_ORDER_FILE} ORDER_FILE LIMIT 20) + if("${ORDER_FILE}" STREQUAL "\n") + set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS ${CLANG_ORDER_FILE}) + elseif(LINKER_ORDER_FILE_WORKS) target_link_libraries(clang "-Wl,-order_file,${CLANG_ORDER_FILE}") set_target_properties(clang PROPERTIES LINK_DEPENDS ${CLANG_ORDER_FILE}) endif() |
