Xcode 4.5.1 get stuck when archiving

Question

I just upgraded my xcode to version 4.5.1.
Everything worked fine before but now, when I Archive the project, xcode get stuck/hanging and never finishes the archiving.
In the status on top, the text says:

Compiling 10 of 10 source files...

Nothing happens after that. It is just stuck.
I can still compile and build the code (without archiving) and everything runs just fine in the simulator.

I have reinstalled xcode. The issue still happens after that.
Any suggestion will be appriciated.

More info:
I've pinpointed the problem to a specific line of code:
CGRect tmpFrame3 = seeDetailsButton.frame;
I don't see any problem with this line...
Why would it work fine when building and running in the simulator but fail when archiving???

Answer 1

I figured out what is going on here.
First, it is not related to the archive process itself but to the build in Release mode.
The reason that I had the problem during archive is because then it builds in release mode.

About the issue itself:
It seems that there is some sort of an Apple compiler bug in xcode 4.5.1.
I'm using the Apple LLVM compiler 4.1. During compilation it has different optimization levels.
In Debug - the optimization is set to 'None' and is off. In release it is set to 'Fastest, Smallest [-Os]'. When I turn off the optimization in release mode (set it to 'None') - the issue does not happen.

More info:
After digging in my code, and trying to figure out what would cause a compiler bug during optimization, I saw that I had the following:

__weak ProfileButton *tmp = myButton;

Where ProfileButton is just a regular button inherits from UIButton.
When I remove the __weak everything works just fine. Even when I set the compiler optimization to 'Fastest, Smallest [-Os]'.