Path: utzoo!attcan!uunet!lll-winken!lll-tis!ames!mailrus!ulowell!apollo!oj
From: oj@apollo.COM (Ellis Oliver Jones)
Newsgroups: comp.sys.apollo
Subject: Re: Please include architecture define in cpp
Summary: _ISP__M68K
Message-ID: <3f6a319b.d5b2@apollo.COM>
Date: 2 Nov 88 00:36:00 GMT
References: <17414@shemp.CS.UCLA.EDU>
Reply-To: oj@canyon.UUCP (Ellis Oliver Jones)
Organization: Apollo Computer, Chelmsford, MA
Lines: 43

In article <17414@shemp.CS.UCLA.EDU> casey@COGNET.UCLA.EDU (Casey Leedom) writes:
>I need to put some byte order ifdef's in my code based on CPU
>architecture type. 
>The Apollo SR10 cpp doesn't define the architecture
>type being compiled on.

Yes it does!  There are two symbols:
_ISP__M68K  (underscore I S P underscore underscore M 6 8 K )
_ISP__A88K  (underscore I S P underscore underscore A 8 8 K )

In an Apollo SR10 C compiler, both are defined, and one has a nonzero value.
_ISP__M68K means Motorola 68K cpus.
_ISP__A88K means Apollo PRISM cpus (DN10000)

For compatibility with SR9.7, I use cpp stuff like the following:

#ifdef _ISP__A88K
  /* do whatever for SR10 (regardless of CPU type) */
#if _ISP__A88K
  /* do whatever for PRISM CPUS */
#endif
#if _ISP__M68K
  /* do whatever for Motorola 68K CPUS */
#endif
#else
  /* do whatever for pre-SR10 */
#endif

The following symbols are also defined:

#define apollo 1              
#define aegis 1               
#define unix 1                
#define m68000 1              
#define timezone _bky_timezone

The PRISM is in fact big-endian, and data-compatible
with the Motorola cpus.

To stop idle speculation about the meaning of A88K, the
"A" means Apollo, the "88" refers to the year of the first release
of a cpu of the type, and I have no idea what the "K" means.

/Ollie Jones  (speaking for myself, not necessarily for Apollo Computer, Inc.)