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From: "Dave Korn" <dk AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: [OT] RE: incompatible types in header files
Date: Tue, 19 Oct 2004 15:15:24 +0100
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X-OriginalArrivalTime: 19 Oct 2004 14:15:24.0343 (UTC) FILETIME=[13423C70:01C4B5E6]

> -----Original Message-----
> From: cygwin-owner On Behalf Of Dave Korn
> Sent: 19 October 2004 14:55

  Sorry, there was one more thing I should have pointed out:

> > -----Original Message-----
> > From: cygwin-owner On Behalf Of Siegmar Gross
> > Sent: 19 October 2004 14:44

> > /usr/include/sys/features.h suggests to define "__rtems__" 


  You should *never* define *anything* that begins with two underscores,
unless you are writing a compiler or system library.  That's not your
namespace, and you should keep out of it!  Anything beginning with two
underscores _belongs_ to the internals of the compiler/libc implementation,
and if you define such macros / functions / variables / any other kind of
name in your code, your code is no longer valid C according to the language
spec.

[  Nor are you allowed to define anything beginning with 'is', since all
such names are reserved for the is-{space,print,alpha,upper,lower} family of
functions.  The same goes for many of the other library functions; for full
details, see 7.1.3 "Reserved identifiers" in the C language spec, and also
7.26 "Future library directions".  ]


    cheers, 
      DaveK
-- 
Can't think of a witty .sigline today....


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