From: Rich Felker <dalias@aerifal.cx>
To: musl@lists.openwall.com
Subject: Re: libm
Date: Fri, 9 Mar 2012 11:01:04 -0500 [thread overview]
Message-ID: <20120309160104.GE184@brightrain.aerifal.cx> (raw)
In-Reply-To: <20120309105703.GT5728@port70.net>
On Fri, Mar 09, 2012 at 11:57:03AM +0100, Szabolcs Nagy wrote:
> > 2. You could add something like:
> > #ifdef __GNUC__
> > #define __RETCAST(x) (__typeof__((x))
> > #else
> > #define __RETCAST(x)
> > #endif
> > Then add __RETCAST((x)), __RETCAST((x)+(y)), etc. Some trick will be
> > needed to make integer types result in a cast to double, though.
> >
>
> ok, that makes sense
>
> actually i'm not sure when the extra () protection
> is needed like __typeof__((x))
> (the reason for it in (x)+(y) is clear)
>
> is it because single argument macros might get
> called with a comma expression?
>
> so
> #define A(x) B((x))
> is ok
>
> but
> #define A(x,y) B((x),(y))
> is redundant
It's probably redundant. Only case I can think of where it might help
is improving(?) the error reporting when some invalid-as-macro-arg
expressions that use ?: as a grouping for a comma operator in the
second operand, or perhaps some fishy stuff with compound literals.
Rich
next prev parent reply other threads:[~2012-03-09 16:01 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-23 16:41 libm Szabolcs Nagy
2012-01-23 17:07 ` libm Rich Felker
2012-01-23 19:12 ` libm Szabolcs Nagy
2012-01-27 16:02 ` libm Szabolcs Nagy
2012-01-27 19:01 ` libm Pascal Cuoq
2012-01-27 19:34 ` libm Rich Felker
2012-01-29 16:34 ` libm Szabolcs Nagy
2012-02-27 21:02 ` libm Szabolcs Nagy
2012-02-27 22:24 ` libm Rich Felker
2012-03-03 22:57 ` libm Szabolcs Nagy
2012-03-04 6:53 ` libm Rich Felker
2012-03-04 14:50 ` libm Szabolcs Nagy
2012-03-04 18:43 ` libm Rich Felker
2012-03-05 8:51 ` libm Szabolcs Nagy
2012-03-05 14:04 ` libm Rich Felker
2012-03-05 15:17 ` libm Szabolcs Nagy
2012-03-05 15:25 ` libm Rich Felker
2012-03-09 10:22 ` libm Rich Felker
2012-03-09 10:57 ` libm Szabolcs Nagy
2012-03-09 16:01 ` Rich Felker [this message]
2012-03-09 11:09 ` libm Szabolcs Nagy
2012-03-09 15:56 ` libm Rich Felker
2012-03-09 17:02 ` libm Rich Felker
2012-03-10 3:28 ` libm Rich Felker
2012-03-10 12:45 ` libm Szabolcs Nagy
2012-03-10 13:12 ` libm Rich Felker
2012-03-10 16:38 ` libm Szabolcs Nagy
2012-03-05 11:08 ` libm Szabolcs Nagy
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