Date: Thu, 9 Mar 1995 15:57:29 -0800 (PST) From: Steven G Kargl <kargl@troutmask.apl.washington.edu> To: joerg_wunsch@uriah.heep.sax.de Cc: freebsd-current@FreeBSD.org Subject: Re: optimization is broken for f77 Message-ID: <199503092357.PAA10760@troutmask.apl.washington.edu> In-Reply-To: <199503092136.WAA08416@uriah.heep.sax.de> from "J Wunsch" at Mar 9, 95 10:36:12 pm
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According to J Wunsch: > > As Steven G Kargl wrote: > > > > It appears that optimization of Fortran compilations is broken > > if the source code contains continuation lines. I have a code > > foo1.f with several continuation lines: > > > > f77 -o foo1 -g foo1.f [compiles and runs and gives foo1.dat] > > f77 -o foo2 -g -O foo1.f [compiles but dies with SIGFPE] > > f77 -o foo3 -g -O2 foo1.f [compiles but dies with SIGFPE at same place] > > gcc optimization problem. I've also stumpled across it when porting > the acm flight simulator, though acm happens to work when compiled > with -O only. > > Ask Bruce for the details. > Thanks, I found out it was gcc version 2.6.2 problem. I used f2c to generate foo1.c, then tried f2c foo1.f gcc -o foo1 -g foo1.c -lf2c -lm [compiles and runs and gives foo1.dat] gcc -o foo2 -g -O foo1.c -lf2c -lm [compiles but dies with SIGFPE] gcc -o foo3 -g -O2 foo1.c -lf2c -lm [compiles but dies with SIGFPE] Strangely, I remembered that f2c could be invoked to enforce Fortran evalution of expressions, so f2c -krd foo1.f gcc -o foo1 -g foo1.c -lf2c -lm [compiles, runs and gives foo1.dat] gcc -o foo2 -g -O foo1.c -lf2c -lm [compiles, runs and gives foo2.dat] gcc -o foo3 -g -O2 foo1.c -lf2c -lm [compiles but dies with SIGFPE] I've also found that gcc 2.6.3 seems to have fixed this problem. -- Steven G. Kargl | Phone: 206-685-4677 | Applied Physics Laboratory | Fax: 206-543-6785 | University of Washington |---------------------| 1013 NE 40th St | FreeBSD 2.1-current | Seattle, WA 98105 |---------------------|
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