From: Jim Wilson <wilson@cygnus.com>
To: Christian Joensson FOA 72 <chj@lin.foa.se>
Cc: egcs@cygnus.com
Subject: Re: A problem with -ansi?
Date: Tue, 07 Apr 1998 19:34:00 -0000 [thread overview]
Message-ID: <199804071957.MAA25307@rtl.cygnus.com> (raw)
In-Reply-To: <199804030900.LAA08225@arnljot.lin.foa.se>
#include <math.h>
...
res = erf(0.1);
Use of -ansi implies that you want an ANSI C compiler. ANSI C specifies
exactly those functions that can be declared in the math.h header file.
This is so that implementations do not needlessly clutter the user namespace.
erf is not one of them, and hence when -ansi is used, math.h can not
declare the erf function. If you have no declaration for erf, then the
compiler assumes it returns an int, and then silently converts the int
return value to double. Hence this program can not work with -ansi.
Jim
prev parent reply other threads:[~1998-04-07 19:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-04-04 14:20 Christian Joensson FOA 72
1998-04-07 19:34 ` Jim Wilson [this message]
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