From:	"Andrew Crabtree" <andrewc AT rosemail DOT rose DOT hp DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Exceptions
Date:	Thu, 14 May 1998 09:55:48 -0700
Organization:	Hewlett-Packard, Roseville
Lines:	26
Message-ID:	<6jf7mi$8l5$1@rosenews.rose.hp.com>
References:	<19980511035425 DOT AAP4598 AT ppp107 DOT cartsys DOT com>
NNTP-Posting-Host:	ros51675cra.rose.hp.com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Nate Eldredge wrote in message
<19980511035425 DOT AAP4598 AT ppp107 DOT cartsys DOT com>...
>>>AFAIK, the standard `-fexceptions' switch handles exceptions through a
>>>table
Yep.

>As I understand it, 2.8.1 just enables `-fsjlj-exceptions' by default, to
>save you the trouble. Unless something I haven't heard about has happened,
>nothing has actually changed.
I doubt this.  I only have the diffs from 2.8.1 but there is a new startup
file crtf.o as well as a linker script
change to make symbol EH_FRAME_START which is what is needed to initialize
the exception tables.  Robert H did the work on this.

In general -

-fexceptions causes exe bloat, but has small runtime overhead
-fsjlj-exceptions doesn't add much to exe but has performance penalty.

I have read reports that say sjlj is faster then table driver on some
architectures though . ??

Andy

- Raw text -