Re: 2.4.0-test10-pre6: Use of abs()

Richard Henderson
2000-11-01T18:25:09Z

On Wed, Nov 01, 2000 at 09:46:19AM -0500, tytso@mit.edu wrote:
> What versions of gcc produce the built-in functions?

2.95 and previous. In 2.96 somewhere we fixed a bug that
automatically prototypes these builtin functions for you;
ie with current code you get an undeclared function warning.

> And does it do so for *all* platforms? (i.e., PPC, Alpha,
> IA64, etc., etc., etc.)

Yes. The thing about abs, though, is that it's "int abs(int)"
which does naughty things with longs on 64-bit targets. You're
much better off writing (x < 0 ? -x : x) directly.

r~