Question about ANSI preprocessor
David Keppel
pardo at cs.washington.edu
Fri Oct 13 03:06:31 AEST 1989
[Sorry for the post, e-mail bounced.]
diamond at 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 at cs.washington.edu
{rutgers,cornell,ucsd,ubc-cs,tektronix}!uw-beaver!june!pardo
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