From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jamie Lokier <egcs@tantalophile.demon.co.uk>
To: Ralph Loader <suckfish@ihug.co.nz>
Cc: gcc@gcc.gnu.org
Subject: Re: [Tiny patch] builtin_constant_p improvement.
Date: Fri, 04 Aug 2000 06:13:00 -0000
Message-id: <20000804151302.B8999@pcep-jamie.cern.ch>
References: <14729.54163.779907.515622@sucky.fish>
X-SW-Source: 2000-08/msg00107.html

Just as well, because Glibc assumes this does work.  See strlen,
<bits/string2.h>.

-- Jamie

Ralph Loader wrote:
> The enclosed patch causes the following (recently posted) code to
> return 1 when compiled as C code.  (It already does when compiled as
> C++).  It removes an assumption that pointers can only be constant if
> they are literals.
> 
> inline int f (const char *const s)
> {
>   if (__builtin_constant_p (s))
>     return 1;
>   else 
>     return 0;
> }
> 
> int g ()
> {
>   return f ("abc");
> }