Subject: bug#10792: 24.0.93; emacs goes comatose opening C header

From: Eli Zaretskii <[email-masked]>
Date: Sat, 11 Feb 2012 21:55:06 +0200

> Date: Sat, 11 Feb 2012 12:26:36 -0500
> From: John Yates <[email-masked]>
> Cc: Alan Mackenzie <[email-masked]>
> 
> When I attemt to visit the following header emacs locks up.  If
> I make the contents of the macro significantly shorted emacs is
> able to open and fontlock it successfully.

In bug #10664 (which is about a similar problem), Alan posted a patch.
Can you try it and see if that fixes your problem?