[Yhc] Location of generated files

[Isaac Dupree]

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Neil Mitchell wrote:
> Hi
> 
>> What about
>>  * foo/System/Cmd.hs, module Data.Whatever
>> or other ridiculous arrangements, where the actual module name contains
>> some number of dots greater than zero but doesn't match the directory
>> structure.
> 
> Similar to putting module Foo in Bar.hs. There is no chance this will
> ever be found by the compiler, so we emit an error. The one exception
> is module Main, which can have any file name.

good. What if Yhc is explicitly invoked on a module other than Main -
then Yhc will "find" that file, right? (assuming yhc supports partial
compilation). In that case I would be happy with giving an error, or
putting the obj-dir in the same place as the file (what if it is used
like main, via some sort of -main-is - and there is always
hugs/ghci-like usage)

> How about we default to being "yhc_obj" instead of "obj" - that way we
> get a clear Yhc specific location, we won't clash with qhc, and we
> don't run the risk of trampling anyone's image data etc.

seems good.

Cabal can set that directory's position/name to be wherever it wants
inside its own build directory, okay.

Isaac
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