Conference hydra::axp-developer

3458.0. "Open Systems Solutions" by HYDRA::AXPDEVELOPER (Alpha Developer support) Wed Apr 09 1997 11:32

    Company Name :  Open Systems Solutions
    Contact Name :  Bancroft Scott
    Phone        :  908-249-5107
    Fax          :  
    Email        :  [email protected]
    Date/Time in :   9-APR-1997 10:32:14
    Entered by   :  Geritt Saylor
    SPE center   :  MRO

    Category     :  Unix
    OS Version   :  
    System H/W   :  


    Brief Description of Problem:
    -----------------------------
Called and sent email:

Hello,

My ASAP program access code 102896.

When compiling the attached which I call simple.c (13 lines long) on DEC
UNIX using the command "cc -nomember_alignment -c simple.c", the following
error condition is generated: 

 "cc: Error: simple.c, line 33: In this statement, the alignment of 
                'arg_ptr' is insufficient."

However when compiling without the -nomember_alignment flag, the 
compilation is successful!

Do you have a workaround for this problem?  I am using DEC UNIX V6.1.

--------------------------------------------------------------------------
Bancroft Scott                                Toll Free    :1-888-OSS-ASN1
Open Systems Solutions, Inc.                  International:1-609-987-9073
[email protected]                                  Tech Support :1-908-249-5107
http://www.oss.com                            Fax          :1-908-249-4636

#include <stdio.h>
#include <stdarg.h>

void       errormsg(int lineNum, char *s, ...) 
{
    va_list         arg_ptr;
    char            buffer[1024];

    va_start(arg_ptr, s);
    vsprintf(buffer, s, arg_ptr);

    fprintf(stderr,"%s\n",buffer);
}

I'm not sure what they're attempting to do here, but the command line argument
-nomember_alignment causes a problem for va_start since it is actually a
structure.  A quick work around for this would be to bracket the #include
statements with the following #pragmas.  

 #pragma member_alignment
 #pragma nomember_alignment

The compiler won't cough, and this doesn't affect the user's desire to
manipulate their own structures.

Gerrit