Re: defined(FOO) in macros

Article View: comp.std.c

Article #4347

#4347

From: Tanmoy Bhattacharya
Date: Sat, 11 Nov 1995 04:56

27 lines
1297 bytes

In article <48190c$bak@nyx10.cs.du.edu>, colin@nyx10.cs.du.edu (Colin Plumb) writes:
|> I noticed that a DEC's Alpha compiler breaks on 
|> 
|> host% cat > foo.f <<EOF
|> #ifndef HAVE_FOO
|> #define HAVE_FOO defined(FOO)
|> #endif
|> 
|> #if HAVE_FOO
|> #error No, we have FOO
|> #else
|> #error Yes, we have no FOO
|> #endif
<snip>
|> Now, the second two diagnostics are fine, but is the compiler allowed to
|> not recognize "defined(FOO)" when it appears as part of a macro expansion?

Yes. see 6.8.1

Cheers
Tanmoy
---
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Path: arc1-ca.pugleaf.net!qcd.lanl.gov!tanmoy
From: tanmoy@qcd.lanl.gov (Tanmoy Bhattacharya)
Newsgroups: comp.std.c
Subject: Re: defined(FOO) in macros
Date: 11 Nov 1995 04:56:22 GMT
Organization: Los Alamos National Laboratory
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