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Re: other/8974: fabs error with -ansi
- From: bangerth at dealii dot org
- To: gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, nobody at gcc dot gnu dot org, warren at eng dot up dot ac dot za
- Date: 21 Dec 2002 03:37:38 -0000
- Subject: Re: other/8974: fabs error with -ansi
- Reply-to: bangerth at dealii dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, nobody at gcc dot gnu dot org, warren at eng dot up dot ac dot za, gcc-gnats at gcc dot gnu dot org
Synopsis: fabs error with -ansi
State-Changed-From-To: open->feedback
State-Changed-By: bangerth
State-Changed-When: Fri Dec 20 19:37:38 2002
State-Changed-Why:
The problem you write seems as if for certain numbers the
implementation of fabs is doing something wrong, but only
on certain machines. Now, fabs is a function that libm
implements, not the compiler, so to find out where the
problem lies exactly, try the following:
- try linking with -static on a machine where it works.
This makes sure that not the local libm is taken, but the
one from the system where it works. Try the other way
round and see whether it then also fails on the machines
it worked on previously.
- Try what happens when you switch on optimization.
Just for the reference, I cannot reproduce the problem
on a PIII, but that was to be expected from your report.
Thanks
Wolfgang
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8974