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From: abh@pogo.cray.com (Andy Hastings)
Newsgroups: comp.unix.wizards,comp.lang.c
Subject: Re: compiler predefines
Message-ID: <351@pogo.cray.com>
Date: Mon, 27-Jul-87 14:58:30 EDT
Article-I.D.: pogo.351
Posted: Mon Jul 27 14:58:30 1987
Date-Received: Thu, 30-Jul-87 03:38:12 EDT
References: <521@quacky.UUCP> <526@quacky.UUCP> <23741@sun.uucp> <865@bsu-cs.UUCP>
Organization: Cray Research, Inc., Mendota Heights, MN
Lines: 31
Summary: change to `mch' for large word sizes
Xref: mnetor comp.unix.wizards:3463 comp.lang.c:3347

In article <865@bsu-cs.UUCP>, dhesi@bsu-cs.UUCP (Rahul Dhesi) writes:
> This program emits C #define statements to the standard output describing
> the machine it is executing on.  The following #defines are generated:
>         Mch_Csz -       size of a char, in bits
>         Mch_Ssz -       size of a short int, in bits
>         Mch_Isz -       size of a plain int, in bits
>         Mch_Lsz -       size of a long int, in bits
>         Mch_BE -        defined if the machine is big-endian; that is, if
>                         the most significant byte in a number appears first.
>         Mch_LE -        defined if the machine is little-endian; that is, if
>                         the least significant byte in a number appears first.
>         Mch_PDP -       defined if the machine uses PDP-11 byte ordering;
>                         LE for bytes-in-a-word and BE for words-in-a-long.
>         Mch_ONE -       defined if the machine uses one's complement arithmetic.
>         Mch_sgc -       defined if characters can be signed.

	Hmm.  The program said `mch: bogus byte size' when I ran it on my
CRAY X-MP.  I changed the definition of bittest to:
		char bittest[9] = "\001\001\001\001\001\001\001\001";
and then I got the correct results:
		#define Mch_Csz 8
		#define Mch_Ssz 64
		#define Mch_Isz 64
		#define Mch_Lsz 64
		#define Mch_BE 1
Much better.

-Andy Hastings			ihnp4!cray!hall!abh
 Cray Research, Inc.		sun!tundra!hall!abh

*CRAY X-MP is a trademark of Cray Research, Inc.