From: Joe Buck <Joe.Buck@synopsys.COM>
To: Andreas Schwab <schwab@suse.de>
Cc: Paul Koning <pkoning@equallogic.com>,
gdr@integrable-solutions.net, zack@codesourcery.com,
gcc@gcc.gnu.org, jason@redhat.com, mark@codesourcery.com,
dberlin@dberlin.org
Subject: Re: Compiling GCC with g++: a report
Date: Tue, 24 May 2005 20:43:00 -0000 [thread overview]
Message-ID: <20050524164346.GA15215@synopsys.com> (raw)
In-Reply-To: <jevf58y8cg.fsf@sykes.suse.de>
On Tue, May 24, 2005 at 05:03:27PM +0200, Andreas Schwab wrote:
> Paul Koning <pkoning@equallogic.com> writes:
> > I hope that doesn't require (void *) casts for pointer arguments
> > passed to the likes of memcpy...
>
> Only the (void*) -> (any*) direction requires a cast in C++, the other
> direction is still converted implicitly.
In my view, the decision by the C standards committees to allow the
omission of the cast in the reverse direction was a bad mistake (and I
wrote my first C program in 1981, if I recall correctly).
While, in
int * int_p = malloc(num_integers * sizeof(int));
the operation is safe, this is only because the void* returned by malloc
is different from the void* obtained by, say,
double d_var;
void * p;
...
p = &d_var;
since one is safe to assign to an int* and the other is not. We really
have two different types here; one represents the top of a lattice and
the other represents the bottom. It would have been nice if there
were a type "aligned_pointer_t" to represent the kind of object returned
by malloc.
For this reason, I always cast the result of malloc to the proper type;
it just feels wrong otherwise.
next prev parent reply other threads:[~2005-05-24 16:44 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-23 11:50 Gabriel Dos Reis
2005-05-23 12:22 ` Ranjit Mathew
2005-05-23 19:07 ` Tom Tromey
2005-05-23 18:04 ` Gabriel Dos Reis
2005-05-24 4:57 ` Gabriel Dos Reis
2005-05-24 4:59 ` Joseph S. Myers
2005-05-24 21:50 ` Kevin Handy
2005-05-25 12:02 ` Bernardo Innocenti
2005-05-24 5:54 ` Zack Weinberg
2005-05-24 6:04 ` Daniel Jacobowitz
2005-05-24 6:22 ` Gabriel Dos Reis
2005-05-24 6:29 ` Zack Weinberg
2005-05-24 6:31 ` Mark Mitchell
2005-05-24 7:08 ` Zack Weinberg
2005-05-24 7:09 ` Mark Mitchell
2005-05-24 7:39 ` Gabriel Dos Reis
2005-05-24 8:48 ` Zack Weinberg
2005-05-24 13:41 ` Gabriel Dos Reis
2005-05-25 0:47 ` Russ Allbery
2005-05-25 1:24 ` Gabriel Dos Reis
2005-05-24 16:07 ` Paolo Bonzini
2005-05-24 16:44 ` Daniel Jacobowitz
2005-05-24 23:53 ` Zack Weinberg
2005-05-25 0:06 ` Daniel Jacobowitz
2005-05-25 0:11 ` Richard Henderson
2005-05-25 0:22 ` Zack Weinberg
2005-05-25 0:26 ` Paolo Carlini
2005-05-25 0:37 ` Zack Weinberg
2005-05-25 0:43 ` Daniel Jacobowitz
2005-05-25 0:48 ` Zack Weinberg
2005-05-25 1:02 ` Paolo Carlini
2005-05-25 3:14 ` Daniel Jacobowitz
2005-05-25 13:30 ` libstdc++ soname and versioning (was: Re: Compiling GCC...) Paolo Carlini
2005-05-25 13:45 ` Theodore Papadopoulo
2005-05-25 13:53 ` libstdc++ soname and versioning Paolo Carlini
2005-05-25 14:18 ` Theodore Papadopoulo
2005-05-25 14:51 ` Gabriel Dos Reis
2005-05-25 14:52 ` Paolo Carlini
2005-05-25 13:54 ` libstdc++ soname and versioning (was: Re: Compiling GCC...) Gabriel Dos Reis
2005-05-25 14:35 ` Theodore Papadopoulo
2005-05-25 16:18 ` Compiling GCC with g++: a report Jason Merrill
2005-05-25 12:44 ` Christoph Hellwig
2005-05-25 13:33 ` Florian Weimer
2005-05-27 3:10 ` Marcin Dalecki
2005-05-24 6:13 ` Andrew Pinski
2005-05-24 6:25 ` Gabriel Dos Reis
2005-05-27 4:04 ` Marcin Dalecki
2005-05-24 6:18 ` Gabriel Dos Reis
2005-05-24 6:43 ` Zack Weinberg
2005-05-24 7:04 ` Mark Mitchell
2005-05-24 8:00 ` Gabriel Dos Reis
2005-05-25 3:45 ` Kaveh R. Ghazi
2005-05-25 7:45 ` DJ Delorie
2005-05-25 8:36 ` Gabriel Dos Reis
2005-05-25 13:38 ` Kaveh R. Ghazi
2005-05-26 13:40 ` Gabriel Dos Reis
2005-05-24 7:38 ` Gabriel Dos Reis
2005-05-24 8:32 ` Zack Weinberg
2005-05-24 13:18 ` Gabriel Dos Reis
2005-05-24 23:45 ` Zack Weinberg
2005-05-25 0:29 ` Gabriel Dos Reis
2005-05-25 0:37 ` Zack Weinberg
2005-05-25 0:52 ` DJ Delorie
2005-05-25 0:55 ` Zack Weinberg
2005-05-25 1:02 ` Ian Lance Taylor
2005-05-25 1:36 ` DJ Delorie
2005-05-25 1:40 ` Zack Weinberg
2005-05-25 2:24 ` Gabriel Dos Reis
2005-05-25 21:37 ` hidden enum constants (Was: Compiling GCC with g++: a report) Giovanni Bajo
2005-05-25 1:50 ` Compiling GCC with g++: a report Gabriel Dos Reis
2005-05-25 2:20 ` DJ Delorie
2005-05-25 1:47 ` Gabriel Dos Reis
2005-05-25 2:08 ` DJ Delorie
2005-05-25 2:36 ` Gabriel Dos Reis
2005-05-25 3:34 ` DJ Delorie
2005-05-25 5:01 ` Gabriel Dos Reis
2005-05-25 1:12 ` Gabriel Dos Reis
2005-05-25 1:47 ` DJ Delorie
2005-05-25 3:20 ` Gabriel Dos Reis
2005-05-27 1:20 ` Marcin Dalecki
2005-05-24 17:17 ` Paul Koning
2005-05-24 17:25 ` Andreas Schwab
2005-05-24 20:43 ` Joe Buck [this message]
2005-05-24 21:40 ` Dale Johannesen
2005-05-24 17:49 ` Gabriel Dos Reis
2005-05-24 6:26 ` Mark Mitchell
2005-05-24 6:54 ` Zack Weinberg
2005-05-24 7:04 ` Mark Mitchell
2005-05-24 15:03 ` Kai Henningsen
2005-05-25 9:51 ` Jason Merrill
2005-05-24 10:01 ` Florian Weimer
2005-05-24 14:22 ` Gabriel Dos Reis
2005-05-24 18:00 ` Diego Novillo
2005-05-24 20:41 ` Richard Guenther
2005-05-24 23:14 ` Kevin Handy
2005-05-27 3:47 ` Marcin Dalecki
2005-05-27 1:20 ` Marcin Dalecki
2005-05-25 5:26 Paul Schlie
2005-05-25 6:10 ` DJ Delorie
2005-05-25 11:46 ` Paul Schlie
2005-05-25 18:31 ` DJ Delorie
2005-05-25 21:41 ` Paul Schlie
2005-05-26 6:11 ` DJ Delorie
2005-05-26 8:15 ` Paul Schlie
2005-05-26 11:57 ` DJ Delorie
2005-05-25 19:27 Richard Kenner
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