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* Re: c/3711: va_arg + var size struct + typeof crash gcc 3.1
@ 2001-12-15 9:02 rodrigc
0 siblings, 0 replies; 2+ messages in thread
From: rodrigc @ 2001-12-15 9:02 UTC (permalink / raw)
To: gcc-bugs, gcc-prs, nicola, nobody
Synopsis: va_arg + var size struct + typeof crash gcc 3.1
State-Changed-From-To: open->analyzed
State-Changed-By: rodrigc
State-Changed-When: Sat Dec 15 09:02:41 2001
State-Changed-Why:
With gcc 3.1 20011207, I get the following ICE
your code example:
x.c: In function `functionWithArgs':
x.c:24: Internal compiler error in instantiate_virtual_regs_1, at function.c:3873
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.
Problem goes away if I make the char x[] a fixed instead
of variable size.
Problem does not occur in gcc 3.0.3
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3711
^ permalink raw reply [flat|nested] 2+ messages in thread
* c/3711: va_arg + var size struct + typeof crash gcc 3.1
@ 2001-07-17 8:36 Nicola Pero
0 siblings, 0 replies; 2+ messages in thread
From: Nicola Pero @ 2001-07-17 8:36 UTC (permalink / raw)
To: gcc-gnats
>Number: 3711
>Category: c
>Synopsis: va_arg + var size struct + typeof crash gcc 3.1
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: ice-on-legal-code
>Submitter-Id: net
>Arrival-Date: Tue Jul 17 08:36:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Nicola Pero
>Release: 3.1 20010717
>Organization:
>Environment:
gnu
>Description:
Gcc 3.1 seems to have problems with typeof + va_arg
+ variable size structs; the code shown crashes gcc-3.1;
it works with the other gcc versions I tried,
which were gcc-3.0 and gcc-2.91.66.
>How-To-Repeat:
Compile the following code:
#include <stdarg.h>
#include <stdio.h>
/* This function really accepts a size, and then a struct.
We use variable args only to show a bug in the compiler. */
void functionWithArgs (int size, ...)
{
struct
{
char x[size];
} dummy;
va_list ap;
int i;
va_start (ap, size);
dummy = va_arg (ap, typeof(dummy));
for (i = 0; i < size; i++)
{
printf ("%c\n", (dummy.x)[i]);
}
va_end (ap);
}
int main (void)
{
struct
{
char y[5];
} test;
(test.y)[0] = '1';
(test.y)[1] = '2';
(test.y)[2] = '3';
(test.y)[3] = '4';
(test.y)[4] = '5';
functionWithArgs (5, test);
return 0;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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2001-12-15 9:02 c/3711: va_arg + var size struct + typeof crash gcc 3.1 rodrigc
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2001-07-17 8:36 Nicola Pero
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