iOS: Remove need for separate qtiosmain library

We can combine the hybrid and non-hybrid use-cases into a single static
library if we are careful about which symbols are included in which
object files. By limiting the main() and qt_user_main() functions to
their own translation units, the linker will only pick them up if they
are missing at link time (the user's program do not provide them).

This technique is resilient to the -ObjC linker flag, which includes all
object files that implement an ObjectiveC class or category, but will
fail if the -all_load flag is passed to the linker, as we'll then have
duplicate symbols for either main() or qt_user_main(). The latter should
not happen unless the user provides the flag manually, and in the case
he or she does, there's ways to work around it by providing less global
flags such as -ObjC or -force_load.

Change-Id: Ie2f8e10a7265d007bf45cb1dd83f19cff0693551
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

1 files changed, 47 insertions, 1 deletions

diff --git a/src/plugins/platforms/ios/qiosapplicationdelegate.mm b/src/plugins/platforms/ios/qiosapplicationdelegate.mm
index 10cbe529c4..571de9ffda 100644
--- a/src/plugins/platforms/ios/qiosapplicationdelegate.mm
+++ b/src/plugins/platforms/ios/qiosapplicationdelegate.mm
@@ -39,8 +39,11 @@
 **
 ****************************************************************************/
 
-#import "qiosapplicationdelegate.h"
+#include "qiosapplicationdelegate.h"
+
+#include "qiosviewcontroller.h"
 #include "qioswindow.h"
+
 #include <QtCore/QtCore>
 
 @implementation QIOSApplicationDelegate
@@ -93,4 +96,47 @@
 
 @end
 
+extern int qt_user_main(int argc, char *argv[]);
+
+@implementation QIOSMainWrapperApplicationDelegate
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
+{
+    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
+    self.qiosViewController = [[[QIOSViewController alloc] init] autorelease];
+    self.window.rootViewController = self.qiosViewController;
+
+#ifdef QT_DEBUG
+    self.window.backgroundColor = [UIColor cyanColor];
+#endif
+
+    [self.window makeKeyAndVisible];
+
+    // We schedule the main-redirection for the next eventloop pass so that we
+    // can return from this function and let UIApplicationMain finish its job.
+    [NSTimer scheduledTimerWithTimeInterval:.01f target:self
+        selector:@selector(runUserMain) userInfo:nil repeats:NO];
+
+    if ([QIOSApplicationDelegate instancesRespondToSelector:_cmd])
+        return [super application:application didFinishLaunchingWithOptions:launchOptions];
+    else
+        return YES;
+}
+
+- (void)runUserMain
+{
+    NSArray *arguments = [[NSProcessInfo processInfo] arguments];
+    int argc = arguments.count;
+    char **argv = new char*[argc];
+    for (int i = 0; i < argc; ++i) {
+        NSString *arg = [arguments objectAtIndex:i];
+        argv[i] = reinterpret_cast<char *>(malloc([arg lengthOfBytesUsingEncoding:[NSString defaultCStringEncoding]]));
+        strcpy(argv[i], [arg cStringUsingEncoding:[NSString defaultCStringEncoding]]);
+    }
+
+    qt_user_main(argc, argv);
+    delete[] argv;
+}
+
+@end