Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uunet!mcsun!cernvax!chx400!ethz!iis!prl
From: prl@iis.UUCP (Peter Lamb)
Newsgroups: comp.lang.c++
Subject: Re: stdarg on sparc
Message-ID: <2832@iis.UUCP>
Date: 14 Dec 89 08:50:31 GMT
References: <2030@diamond.warwick.ac.uk>
Organization: Integrated Systems Lab., ETH Zuerich
Lines: 62

If you have source, another approach to the varargs problem on Sun4
(and DS[23]100) is to change the compiler not to add the _aunnn__ that it
tacks onto the variable names IFF they begin with the magic string for
varargs.  The following patch will do this for 1.2.1 on Sun4. For
DS[23]100, you will need to change the magic string to "va_alist".
2.0 may be patchable in a similar manner.

Doing this saves having to run yet another pre/postprocessor....

Peter Lamb
uucp:  uunet!mcvax!ethz!prl     eunet: prl@iis.ethz.ch  Tel:   +411 256 5241
Integrated Systems Laboratory
ETH-Zentrum, 8092 Zurich


@
@ Recognise the __builtin_ construct for Sun4 systems - used by the
@ varargs.h stuff to tell the compiler that the arguments passed in
@ registers have to be saved on the stack. Needed for the fix in
@ form() in lib/stream/out.c
@
*** print.c_dist	Tue Feb 24 16:44:40 1987
--- print.c	Mon Oct 16 11:10:42 1989
***************
*** 17,22 ****
--- 17,23 ----
  #include "cfront.h"
  #include "size.h"
  
+ extern int strncmp(const char*, const char*, int);
  extern FILE* out_file;
  char emode = 0;
  extern int ntok; 
***************
*** 581,587 ****
  					fprintf(out_file,"_auto__O%d.__C%d_",i,i);
  				else
  //					putstring("_auto_");
! 					fprintf(out_file,"_au%d_",lex_level);
  			}
  			break;
  		case CLASS:
--- 582,595 ----
  					fprintf(out_file,"_auto__O%d.__C%d_",i,i);
  				else
  //					putstring("_auto_");
! //					fprintf(out_file,"_au%d_",lex_level);
! //					Hack for sun4 varargs;
! //					Don't add _au%d if the name starts
! //					with "__builtin_". prl 16/10/89
! 					if(!string
! 					|| strncmp(string, "__builtin_",10))
! 						fprintf(out_file,
! 							"_au%d_",lex_level);
  			}
  			break;
  		case CLASS:
-- 
Peter Lamb
uucp:  uunet!mcvax!ethz!prl	eunet: prl@iis.ethz.ch	Tel:   +411 256 5241
Integrated Systems Laboratory
ETH-Zentrum, 8092 Zurich