From: Alexander Monakov <amonakov@ispras.ru>
To: musl@lists.openwall.com
Subject: Re: x86_64 and x32 fail to build
Date: Tue, 21 Apr 2015 11:56:30 +0300 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.11.1504211148400.2677@monopod.intra.ispras.ru> (raw)
In-Reply-To: <1429601413.3111.1.camel@inria.fr>
On Tue, 21 Apr 2015, Jens Gustedt wrote:
> Since such a solution would use a gcc'ish extension __typeof__,
> anyhow, perhaps it would be preferable to use another one, namely
> __builtin_choose_expr:
>
> #define __scc(X) __builtin_choose_expr(sizeof(1?(X):0ULL) < 8, (unsigned long) (X), (long long) (X))
>
> if that helps to quiencen the warning?
It doesn't help: the warning is still produced for the unevaluated branch of
__builtin_choose_expr, similarly to ternary operator (I tested with gcc-4.8).
My __scc1 could be written a bit simpler:
#define __scc1(X) (__typeof__((X)-(X))) (X)
but still it doesn't work for pointers to void or incomplete types.
Alexander
prev parent reply other threads:[~2015-04-21 8:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-20 19:21 Alexander Monakov
2015-04-20 21:13 ` Rich Felker
2015-04-20 21:30 ` Alexander Monakov
2015-04-20 22:00 ` Alexander Monakov
2015-04-20 23:56 ` Alexander Monakov
2015-04-21 1:35 ` Rich Felker
2015-04-21 7:30 ` Jens Gustedt
2015-04-21 8:56 ` Alexander Monakov [this message]
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