Is it possible to create one binary and, according to the OS X version, have it behave differently?
Any ideas (Cocoa- and Xcode- friendly) on how this could be achieved?
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2 Answers
The main executable for your application can be a small program which runs on all versions, interrogates the OSX version and then either loads a bundle which contains the version of the application desired or starts a second executable which is bundled into the application package.
The bundle loading option should be easier to do and look slicker from as user perspective as only a single application would be running. Using the other approach one application would start and then close while starting another so it's likely to have a visual side effect.
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Wain got that right.. use one app and have it load bundles based on the OS version
something like
int main(args) { NSBundle *bundle = nil; if(osVersion < 10.5) bundle = [NSBundle bundleWithURL:pathToBundleFor105InAppsBundle]; else bundle = [NSBundle bundleWithURL:pathToBundleFor106andUpInAppsBundle]; [bundle load]; Class appDelegateClass = NSClassFromString(@"AppDelegateClass"); DDAppDelegate = [[appDelegateClass alloc] init]; [[NSApplication sharedApplication] setDelegate:DDAppDelegate]; status = NSApplicationMain(argc, (const char **)argv); } 