https://bugzilla.novell.com/show_bug.cgi?id=383475
User mfabian@novell.com added comment
https://bugzilla.novell.com/show_bug.cgi?id=383475#c7
--- Comment #7 from Mike Fabian 2008-04-25 07:33:03 MST ---
If you rename the file from x.cc to x.c, C mode font-locking is used
which probably uses simpler regular expressions for fontification
than those used for C++ mode.
I wonder whether the regular expressions used for C++ can be
simplified without introducing inaccuracies in C++ font-locking.
I.e. is the slowness of C++ font-locking something which can not be
avoided or is there a stupid bug in the regular expressions used for
C++ font-locking.
Harald found that this also happens with older versions of Emacs.
That it happens the same way for both GNU Emacs and XEmacs is probably
another indicator that the problem is in code for C++ font-locking
shared by both versions of Emacs which has not changed for many years.
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