From: Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
To: Jim Wilson <wilson@cygnus.com>
Cc: jbuck@synopsys.com, egcs@cygnus.com
Subject: Re: Strange warning (variable might be clobbered by `longjmp' or `vfork')
Date: Wed, 03 Sep 1997 02:29:00 -0000 [thread overview]
Message-ID: <9709030929.AA21411@issan.informatik.uni-dortmund.de> (raw)
In-Reply-To: <199709011909.MAA19869@cygnus.com>
Jim Wilson <wilson@cygnus.com> writes:
|> It is not a bug in user programs. It is a bug in gcc'c EH support.
|> I have discussed this in other mesages, but the basic problem is that flow
|> can't understand the RTL emitted when exception handling is enabled. This
|> causes the dataflow info computed by flow to be incorrect. This incorrect
|> info is know to cause at least two problems:
|> 1) Some C++ programs get compiler core dumps due to unallocated pseudos.
|> 2) Some C++ programs get bogus warnings when -Wall is used.
Another problem is that -fdefer-pop breaks due to sjlj EH, especially
visible when a complicated expression involves multiple EH regions.
Andreas.
next prev parent reply other threads:[~1997-09-03 2:29 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-08-31 23:12 Joe Buck
1997-09-01 12:09 ` Jim Wilson
1997-09-01 12:23 ` John Carr
1997-09-01 15:32 ` Strange warning (variable might be clobbered by `longjmp' or`vfork') Toon Moene
1997-09-02 9:52 ` Strange warning (variable might be clobbered by `longjmp' or Joe Buck
1997-09-02 11:50 ` Jim Wilson
1997-09-02 12:20 ` Joe Buck
1997-09-02 15:24 ` Jim Wilson
1997-09-02 19:15 ` Jeffrey A Law
1997-09-02 19:32 ` Richard Henderson
1997-09-02 20:05 ` Jeffrey A Law
1997-09-03 13:09 ` Richard Henderson
1997-09-01 13:48 ` Wrong debug info on pc-linux-gnu ? Oleg Krivosheev
1997-09-02 6:14 ` Bernd Schmidt
1997-09-03 2:29 ` Andreas Schwab [this message]
1997-11-01 21:24 ` Strange warning (variable might be clobbered by `longjmp' or `vfork') Jeffrey A Law
-- strict thread matches above, loose matches on Subject: below --
1997-08-31 22:48 Jim Wilson
1997-08-31 2:07 egcs 970828 and X11 on linux/x86 H.J. Lu
1997-08-31 18:57 ` Strange warning (variable might be clobbered by `longjmp' or `vfork') Kamil Iskra
1997-08-31 1:23 Jim Wilson
1997-11-01 21:16 ` Jeffrey A Law
1997-08-26 15:53 Mike Stump
1997-08-26 13:14 Tobias Ringstrom
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