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* Re: c++/7884: code compiled with optimization flag causes segmentation violation
@ 2002-09-12 4:16 Gabriel Dos Reis
0 siblings, 0 replies; 3+ messages in thread
From: Gabriel Dos Reis @ 2002-09-12 4:16 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/7884; it has been noted by GNATS.
From: Gabriel Dos Reis <gdr@integrable-solutions.net>
To: arnez@de.ibm.com
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c++/7884: code compiled with optimization flag causes segmentation violation
Date: 12 Sep 2002 13:03:44 +0200
arnez@de.ibm.com writes:
| The following reply was made to PR c++/7884; it has been noted by GNATS.
|
| From: arnez@de.ibm.com
| To: aloeff@de.ibm.com, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
| gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
| Cc:
| Subject: Re: c++/7884: code compiled with optimization flag causes segmentation
| violation
| Date: Thu, 12 Sep 2002 10:44:10 +0200
|
| I don't quite understand why (char *)foo is an rvalue.
Because the C++ definition says so.
| Using a cast as an lvalue is listed as one of GCC's extensions.
That particular extension doesn't play well with the rest of the
language and is causing more troubles than it solves any real
problems. It may disappear in some future releases of GCC.
-- Gaby
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: c++/7884: code compiled with optimization flag causes segmentation violation
@ 2002-09-12 5:36 Gabriel Dos Reis
0 siblings, 0 replies; 3+ messages in thread
From: Gabriel Dos Reis @ 2002-09-12 5:36 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/7884; it has been noted by GNATS.
From: Gabriel Dos Reis <gdr@integrable-solutions.net>
To: "Andreas Arnez" <ARNEZ@de.ibm.com>
Cc: gcc-gnats@gcc.gnu.org
Subject: Re: c++/7884: code compiled with optimization flag causes segmentation violation
Date: 12 Sep 2002 14:22:23 +0200
"Andreas Arnez" <ARNEZ@de.ibm.com> writes:
| [1 <text/plain; us-ascii (7bit)>]
| > That particular extension doesn't play well with the rest of the
| > language and is causing more troubles than it solves any real
| > problems. It may disappear in some future releases of GCC.
|
| Then is there any way to instruct the compiler to yield a
| diagnostic for this?
None currently exists. But recent patches and discussions about that
extension (and its unexpected implications) may cause such a siwtch to
happen.
| I tried -ansi, -pedantic, and -Wall.
| I would have expected -ansi to consider casts as rvalues.
So would I.
-- Gaby
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: c++/7884: code compiled with optimization flag causes segmentation violation
@ 2002-09-12 1:46 arnez
0 siblings, 0 replies; 3+ messages in thread
From: arnez @ 2002-09-12 1:46 UTC (permalink / raw)
To: nobody; +Cc: gcc-prs
The following reply was made to PR c++/7884; it has been noted by GNATS.
From: arnez@de.ibm.com
To: aloeff@de.ibm.com, gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org,
gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:
Subject: Re: c++/7884: code compiled with optimization flag causes segmentation
violation
Date: Thu, 12 Sep 2002 10:44:10 +0200
I don't quite understand why (char *)foo is an rvalue. Using a cast as
an lvalue is listed as one of GCC's extensions. In particular GCC
allows me to write:
extern int do_stuff(void *bar);
int f(char *str)
{
void *foo;
(char *) foo = str+1;
return do_stuff(foo);
}
I can compile this both in C or C++ mode, even with -ansi and -pedantic.
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7884
^ permalink raw reply [flat|nested] 3+ messages in thread
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2002-09-12 4:16 c++/7884: code compiled with optimization flag causes segmentation violation Gabriel Dos Reis
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2002-09-12 5:36 Gabriel Dos Reis
2002-09-12 1:46 arnez
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