[Haskell-cafe] trouble installing greencard -- -fno-prune-tydecls flag ( was Re: trivial function application question )

[Yitzchak Gale]

Ross Paterson wrote:
>> Cabal would need to crawl over the source files
>> to see what preprocessors are really needed.

Duncan Coutts wrote:
> Yes, this is exactly what Cabal should do.

In the meantime, how about the following:

In default non-verbose mode, silently memoize
the list of packages that were not found. Then,
only if something goes wrong, say something like:

"The package failed to build. Perhaps the reason
is that one of the following packages was not found:"

In non-default verbose mode, behave as now.

-Yitz