diff options
Diffstat (limited to 'mkspecs/macx-ios-clang/features/qt.prf')
| -rw-r--r-- | mkspecs/macx-ios-clang/features/qt.prf | 76 |
1 files changed, 25 insertions, 51 deletions
diff --git a/mkspecs/macx-ios-clang/features/qt.prf b/mkspecs/macx-ios-clang/features/qt.prf index 9fa882c99f..2897c62819 100644 --- a/mkspecs/macx-ios-clang/features/qt.prf +++ b/mkspecs/macx-ios-clang/features/qt.prf @@ -1,8 +1,5 @@ equals(TEMPLATE, app):contains(QT, gui(-private)?) { - !macx-xcode: \ - error("Linking the iOS platform plugin requires bulding through Xcode") - LIBS *= -L$$[QT_INSTALL_PLUGINS/get]/platforms lib_name = qios @@ -21,54 +18,31 @@ equals(TEMPLATE, app):contains(QT, gui(-private)?) { CONFIG -= import_qpa_plugin !no_main_wrapper { - # Instead of messing with the user's main function we go the other - # way and change the application entry point to call our main wrapper. - # This entry point is the 'start' symbol, provided by crt1.o, so we - # make a copy of the file and rename the '_main' unresolved symbol - # to our wrapper function, '_qtmn', injecting ourselves into the app - # startup. Once Apple starts shipping the LLVM linker (lld) we may - # get rid of this step completely and just pass -e _qtmn to the - # linker, taking advantage of the new LC_MAIN load command. - - # We know that iOS 3.1 and up uses crt1.3.1.o (technically not - # true for simulator, but the SDK has a symlink to the correct file). - original_crt_path = "$(SDK_DIR)/usr/lib/crt1.3.1.o" - - xcode_objects_path = "$(OBJECT_FILE_DIR_$(CURRENT_VARIANT))/$(CURRENT_ARCH)" - custom_crt_filename = "crt1_qt.o" - custom_crt_path = "$$xcode_objects_path/$$custom_crt_filename" - - EOC = $$escape_expand(\\n\\t) - create_custom_crt.commands = \ - # Copy original crt1 to build directory - "$$QMAKE_COPY_FILE $$original_crt_path $$custom_crt_path $$EOC" \ - # And rename all occurrences of _main to _qtmn - "strings -t d - $${custom_crt_path}" \ - "| sed -n 's/^\\([0-9]\\{1,\\}\\) _main\$\$/\1/p'" \ - "| while read offset; do" \ - "printf '_qtmn'" \ - "| dd of=$${custom_crt_path} bs=1 seek=\$\$offset conv=notrunc >/dev/null 2>&1" \ - "; done" - create_custom_crt.depends = $$original_crt_path - create_custom_crt.target = $$custom_crt_path - preprocess.depends = create_custom_crt - QMAKE_EXTRA_TARGETS += create_custom_crt preprocess - - clean_custom_crt.commands = "$$QMAKE_DEL_FILE $$custom_crt_path" - preprocess_clean.depends += clean_custom_crt - QMAKE_EXTRA_TARGETS += clean_custom_crt preprocess_clean - - # Prevent usage of new LC_MAIN load command, which skips start/crt1 - # and calls main from the loader. We rely on injecting into start. - QMAKE_LFLAGS += -Wl,-no_new_main - - # Explicitly link against our modified crt1 object - QMAKE_LFLAGS += -nostartfiles -l$${custom_crt_filename} - - # Workaround for QMAKE_PBX_LIBPATHS mangling the Xcode variables - lib_search_path.name = LIBRARY_SEARCH_PATHS - lib_search_path.value = $$xcode_objects_path - QMAKE_MAC_XCODE_SETTINGS += lib_search_path + # We use ld to rename the _main symbol to _qt_main, so that we don't get a symbol clash + # with the _main we provide that calls UIApplicationMain. We need to make a copy of the + # original object file, as ld will not copy over DWARF debug information to the output + # file. Instead, it will inject a reference back to the original object file, so when + # Xcode runs dsymutil to make the final dSYM file it will still find the debug info + # for the object file that provided the original _main. This back-reference has the + # interesting side-effect of the debug information still referring to the original + # symbol name, so stack-traces will show both our wrapper main and the original + # user main as 'main', and adding a symbolic breakpoint for 'main' will break on + # both functions. Although a bit weird, it's a good thing, as the user will still be + # able to add symbolic breakpoints for 'main', not caring that the symbol is actually + # called 'qt_main' now. + + isEmpty(OBJECTS_DIR): \ + OBJECTS_DIR = . + + !isEmpty(QMAKE_PRE_LINK): \ + QMAKE_PRE_LINK += ";" + + QMAKE_PRE_LINK += \ + "for f in $(find $${OBJECTS_DIR} -name '*.o'); do" \ + "(nm $f | grep -q 'T _main' && cp $f $f.original" \ + "&& ld -r -alias _main _qt_main -unexported_symbol _main $f.original -o $f)" \ + "|| true" \ + "; done" } } |