Article View: comp.std.c
Article #711Re: Question about ANSI preprocessor
From: David Keppel
Date: Thu, 12 Oct 1989 17:06
Date: Thu, 12 Oct 1989 17:06
31 lines
1471 bytes
1471 bytes
[Sorry for the post, e-mail bounced.]
diamond@riks. (Norman Diamond) writes:
>For example, consider:
>
> #include <stdio.h>
> #define mf1(x) printf("Hello, world.\n")
> #define m2 (z);
> main(){
> mf1 m2
> }
>
>I will bet that every pre-ANSI compiler/preprocessor would have
>rejected the above program. But ANSI requires it to print
>"Hello, world.\n".
I tried this on gcc v 1.36/VAX with the `-ansi' flag and got `m2 (z)'.
Should I be filing a bug report? `gcc' is generally pretty robust
about such things...
>In fact I think I can construct a few perverse macros, which will make
>the preprocessor take EXPONENTIAL TIME in proportion to the length of
>the program.
That should make an interesting submit to the Obfuscated C contest!
;-D on ( What do you mean, `non-obfuscated C' ?-) Pardo
--
pardo@cs.washington.edu
{rutgers,cornell,ucsd,ubc-cs,tektronix}!uw-beaver!june!pardo
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!rice!uw-beaver!uw-june!pardo From: pardo@cs.washington.edu (David Keppel) Newsgroups: comp.std.c Subject: Re: Question about ANSI preprocessor Message-ID: <9473@june.cs.washington.edu> Date: 12 Oct 89 17:06:31 GMT References: <10879@riks.csl.sony.co.jp> <11163@smoke.BRL.MIL> <10893@riks.csl.sony.co.jp> Reply-To: pardo@june.cs.washington.edu (David Keppel) Organization: University of Washington, Computer Science, Seattle Lines: 31