On Sun, 2004-01-04 at 10:20, Graham Klyne wrote:[...] I would expect that when using GHC to compile a stand-alone Haskell program, any expressions that are not referenced are not included in the final object program, so leaving these test cases uncommented would be harmless: is this so?
If your test functions are not exported, I would expect that this is the case. [...]
Yes, unused functions which are not exported are nuked during compilation, even without using the -O flag. But don't guess, just ask GHC itself via its -ddump-occur-anal flag. (DISCLAIMER: I'm not responsible for the, well, slightly obscure name of this flag! :-) There are a lot more flags of this kind, see:
http://haskell.org/ghc/docs/latest/html/users_guide/options-debugging.html#DUMPING-OUTPUT
When you are *really* curious, use -v5.
Simon^2: The -ddump-all and -ddump-most flags mentioned on the page above are not working anymore, -v5 / -v4 seem to do their job now. Should the documentation be fixed or GHC?
Cheers, S.
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