ghc 6.2 possible bug with gcc 3.3.x, strange parse error

[Donald Bruce Stewart]

bjpop:
> Hi,
> 
> Something very mysterious is happening when buddha is built with
> GHC 6.2 on machines that have gcc 3.3.x
> 
> This bug has occurred on these two machines so far:
> 
>     Gentoo linux with gcc 3.3.2
>     FreeBSD with gcc 3.3.3
> 
> Both x86 machines.
> 
> Note however, that the bug does not appear on machines with 
> gcc 2.x series compilers.
> 
> buddha can be downloaded from:
> 
>    www.cs.mu.oz.au/~bjpop/buddha
> 
> The file in question is (from the buddha soure package): 
> 
>    prelude/Buddha/List_B.hs
> 
> GHC gives a parse error on this line of code:
> 
>    infix 5 \\
> 
> The error message is:
> 
>    List_B.hs:23: parse error on input `\'
> 
> I don't think there is any parse error in the file, and GHC 6.2 with gcc 2.x
> doesn't think so either.

I'm pretty sure SimonM mentioned something on the list a few months ago
about gcc3-cpp changing the way it processes the end of \
        line style tokens.
It would be in the archives, and maybe in the user's guide (there's
something about string gaps in there, at least).

Cheers,
   Don