Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!vsi1!wyse!mips!rogerk
From: rogerk@mips.COM (Roger B.A. Klorese)
Newsgroups: comp.unix.ultrix
Subject: Re: Ultrix 3.0 (RISC) Compiler bug.
Message-ID: <18555@servitude.mips.COM>
Date: 30 Apr 89 18:25:32 GMT
References: <8829@polya.Stanford.EDU>
Reply-To: rogerk@servitude.mips.COM (Roger B.A. Klorese)
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 26
Summary:

In article <8829@polya.Stanford.EDU> mason@goofy.Stanford.EDU (Tony Mason) writes:
>The RISC compiler fails to handle enumerated type comparisons correctly.
>Let me guess, it's fixed in the Mips 2.0 compiler, right? :-)

Actually, that's a good guess...

As our C compiler is based on an early (pre-enums) PCC, when we chose to
implement enums, we had a choice of three models, either (a) treating them
as pointers, (b) treating them as integers, or (c) treating them as a new
derived type.  Up intil the 2.0 release, we have treated them as a derived
type, which prohibits some operations.  As of 2.0, we treat them as integers.

   % [rogerk] 101) cc1.31 foo2.c
   ccom: Warning: foo2.c, line 6: enumeration type clash, operator =
         		   z = (a == b);
         ------------------------------^
   % [rogerk] 102) cc2.0 foo2.c
   % [rogerk] 103)

This release has recently been shipped to DEC as input for their poritng
process.
-- 
Roger B.A. Klorese                                  MIPS Computer Systems, Inc.
{ames,decwrl,pyramid}!mips!rogerk      928 E. Arques Ave.  Sunnyvale, CA  94086
rogerk@servitude.mips.COM (rogerk%mips.COM@ames.arc.nasa.gov)   +1 408 991-7802
"I want to live where it's always Saturday."  -- Guadalcanal Diary