"ghc -c foo.bar" silently does nothing

[igloo]

ghc -c foo.bar silently does nothing. It thinks that foo.bar is an extra file to link, but -c means "do not link".

Instead, it should give an error (or at the very least, a warning).

[simonmar]

Fixed.

Tue Sep 23 15:49:56 BST 2008  Simon Marlow <simonmar@microsoft.com>
  * #2566: emit a warning for 'ghc -c foo.bar'
  
  $ ghc -c foo.bar
  Warning: the following files would be used as linker inputs, but linking is not being done: foo.bar
  ghc: no input files
  Usage: For basic information, try the `--help' option.

testsuite:

Tue Sep 23 15:01:20 BST 2008  Simon Marlow <simonmarhaskell@gmail.com>          
  * add test for #2566, also enable driver100 which wasn't being run

[igloo]

Merged.