c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c

[Tim Prince]

The following reply was made to PR c/5914; it has been noted by GNATS.

From: Tim Prince <tprince@computer.org>
To: jakobus@emss.co.za, gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: c/5914: Infinite loop when compiling with optimisation on of z_log.c of libf2c
Date: Mon, 11 Mar 2002 13:10:26 -0800

 On Monday 11 March 2002 07:46, jakobus@emss.co.za wrote:
 > >Number:         5914
 > >Category:       c
 > >Synopsis:       Infinite loop when compiling with optimisation on of
 > > z_log.c of libf2c Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    unassigned
 > >State:          open
 > >Class:          wrong-code
 > >Submitter-Id:   net
 > >Arrival-Date:   Mon Mar 11 07:56:01 PST 2002
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Ulrich Jakobus
 > >Release:        3.0.4
 > >Organization:
 > >Environment:
 >
 > System: Linux uj-emss 2.2.16 #1 Wed Aug 2 20:22:26 GMT 2000 i686 unknown
 > Architecture: i686
 >
 >
 > host: i686-pc-linux-gnu
 > build: i686-pc-linux-gnu
 > target: i686-pc-linux-gnu
 > configured with: ../gcc-3.0.4/configure
 >
 > >Description:
 >
 >     	Compiling the attached simple and short example file z_log.c (taken
 > from libf2c with specific input parameters) works fine for gcc-2.95.2 with
 > all levels of optimisation. For gcc-3.0.4 it also works for -O, but for -O2
 > or higher we end up in an infinite loop.
 >
 > >How-To-Repeat:
 >
 > 	gcc -O2 z_log.c
 >
 > >Fix:
 >
 Didn't Toon Moene already work on this?  Isn't this a loop at execution 
 time?
 -- 
 Tim Prince