c/8641: va_arg(arglist,type) on HP-UX B.11.00 does not work if sizeof(type) = 6

fl@abas.de fl@abas.de
Tue Nov 19 09:26:00 GMT 2002


>Number:         8641
>Category:       c
>Synopsis:       va_arg(arglist,type) on HP-UX B.11.00 does not work if sizeof(type) = 6
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 19 08:56:16 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Frank Liepold
>Release:        Reading specs from /usr/local/gcc-3.2/lib/gcc-lib/hppa1.1-hp-hpux11.00/3.2/specs Configured with: /m/clever2/pdsoft/src/GCC/gcc/configure --enable-threads=posix --enable-languages=c++ --prefix=/usr/local/gcc-3.2 --with-as=/usr/local/binu
>Organization:
>Environment:
HP-UX hp B.11.00 B 9000/826 100303302 16-user license	
>Description:
with the definition
typedef struct { unsigned char f[6] } my_type; 
a call of va_arg(arglist,my_type) supresses the first
two bytes of the structures array.

I attached the corresponding .i-File (zipped with 
gzip)
>How-To-Repeat:
$ gcc -Wall hp_arglist.i -o arglist_test
$ ./arglist_test
gives output
Argument of calls = 12345
First call
arg 1 = 345

Second call
arg 1 = 345

arg 2 = 345

instead of
Argument of calls = 12345
First call
arg 1 = 12345

Second call
arg 1 = 12345

arg 2 = 12345

>Fix:
Defining 
typedef struct { unsigned char f[6]; 
		 char dummy_for_aligment[2];
               } my_type;
works, because sizeof(my_type)=8.
>Release-Note:
>Audit-Trail:
>Unformatted:
 tils-2.11.2/bin/as --with-gnu-as
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="hp_arglist.i.gz"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="hp_arglist.i.gz"

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