diff options
| -rw-r--r-- | cmake/QtPlugins.cmake.in | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/cmake/QtPlugins.cmake.in b/cmake/QtPlugins.cmake.in index d6d5c829b2..c901f8c47d 100644 --- a/cmake/QtPlugins.cmake.in +++ b/cmake/QtPlugins.cmake.in @@ -119,15 +119,23 @@ if(NOT @BUILD_SHARED_LIBS@) set(_generated_qt_plugin_file_name "${CMAKE_CURRENT_BINARY_DIR}/qt_@QT_MODULE@_${target}.cpp") - set(_generated_qt_plugin_file_name_template "${_generated_qt_plugin_file_name}.in") set(_generated_qt_plugin_file_content "#include <QtPlugin>\nQ_IMPORT_PLUGIN(${_classname})") - # Generate a source file to import that plug-in. Has to be done with configure_file, - # because file(GENERATE) and target_sources has issues with scopes. - file(WRITE "${_generated_qt_plugin_file_name_template}" - "${_generated_qt_plugin_file_content}") - configure_file("${_generated_qt_plugin_file_name_template}" - "${_generated_qt_plugin_file_name}") + # Generate a source file to import that plug-in. Be careful not to + # update the timestamp of the generated file if we are not going to + # change anything. Otherwise we will trigger CMake's autogen to re-run + # and executables will then need to at least relink. + set(need_write TRUE) + if(EXISTS ${_generated_qt_plugin_file_name}) + file(READ ${_generated_qt_plugin_file_name} old_contents) + if(old_contents STREQUAL "${_generated_qt_plugin_file_content}") + set(need_write FALSE) + endif() + endif() + if(need_write) + file(WRITE "${_generated_qt_plugin_file_name}" + "${_generated_qt_plugin_file_content}") + endif() target_sources(${_module_target} INTERFACE "$<${_plugin_condition}:${_generated_qt_plugin_file_name}>") |