clang hangs when compiling using optimisation flag -Os

[rupertdaniel]

Using the latest pre-release 0.2.180221-dev-20180516000001 there is an issue with clang hanging when building some files using the optimisation flag -Os.

I've been able to reproduce the issue with the following code:

id block = ^(NSString *collection, NSString *key, NSData *data) {
	id object = nil;
	
	@try {
		object = [NSKeyedUnarchiver unarchiveObjectWithData:data];
	} @catch (NSException *exception) {
	}
};

[DHowett-MSFT]

It looks like this hang is fixed with Clang 9, at least, which is likely only cold comfort 😄

[edvv]

On the plus side, if winobjc is updated to the latest dependent releases (and if #2719 was fixed) then that would be a massive improvement!