[Haskell-cafe] Downside of -fglasgow-extensions

[manu]

Hello,

I'm trying to build diverse packages from Hackage with ghc 6.8.1,
they usually fail to build because of missing language extensions.

Sometimes I am unable to determine the proper name of the extension  
missing in .cabal
I tend to slap {- #OPTIONS -fglasgow-exts #-} at the top of the  
troublesome file.
It works, but out of curiosity, what is the downside of such an  
approach ? (bigger executables ?)

Thanks

M