* Compilation problem in copying a va_list variable on a 64-bit machine
@ 2010-03-02 18:03 Kristis Makris
2010-03-02 19:12 ` Kevin P. Fleming
0 siblings, 1 reply; 2+ messages in thread
From: Kristis Makris @ 2010-03-02 18:03 UTC (permalink / raw)
To: gcc-help
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Hello,
I am writing a program that needs to copy a variable of type
__builtin_va_list. Copying this variable works correctly with gcc-4.1 on
a 32-bit machine, but it reports a compilation error on a 64-bit
machine. The program is:
#include <stdarg.h>
int main()
{
va_list l1;
va_list l2;
l1 = l2;
return 0;
}
There is no error on a 32-bit machine with gcc-4.1:
$ gcc-4.1 --version
gcc-4.1 (GCC) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
$ gcc-4.1 t.c
The error on a 64-bit machine with gcc-4.1 is:
$ gcc-4.1 --version
gcc-4.1 (GCC) 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
$ gcc-4.1 t.c
t.c: In function 'main':
t.c:8: error: incompatible types in assignment
The error on a 64-bit machine with gcc-4.4 is:
$ gcc-4.4 --version
gcc-4.4 (Ubuntu 4.4.1-4ubuntu9) 4.4.1
$ gcc-4.4 t.c
t.c: In function 'main':
t.c:8: error: incompatible types when assigning to type 'va_list' from type 'struct __va_list_tag *'
Is this a bug in gcc on 64-bit machines ? What is the appropriate way of
copying a variable of type va_list that needs to be preserved ?
Thanks,
Kristis
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Compilation problem in copying a va_list variable on a 64-bit machine
2010-03-02 18:03 Compilation problem in copying a va_list variable on a 64-bit machine Kristis Makris
@ 2010-03-02 19:12 ` Kevin P. Fleming
0 siblings, 0 replies; 2+ messages in thread
From: Kevin P. Fleming @ 2010-03-02 19:12 UTC (permalink / raw)
To: Kristis Makris; +Cc: gcc-help
Kristis Makris wrote:
> Is this a bug in gcc on 64-bit machines ? What is the appropriate way of
> copying a variable of type va_list that needs to be preserved ?
va_copy()
--
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kfleming@digium.com
Check us out at www.digium.com & www.asterisk.org
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