#9938: GHC's link step needs to be told which packages to link -------------------------------------+------------------------------------- Reporter: nomeata | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.11 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Comment (by simonpj): Replying to [comment:4 nomeata]:
I hope that successful linking should not depend on the particular optimizations that went through.
I'm afraid I suspect it does! * When compiling a source module, GHC can find imports from any exposed packages, in this case `transformers`. * But when linking `.o` files, GHC doesn't know which packages to link. So you mus specify on the command line; e.g. `-package transformers`. * If you inline enough things so that there are no remaining references to things from a package, then you don't need to include that package in the link command. This is pretty unusual. The Right Thing is, I guess, when given a `.o` file on the command line, to read its interface file, to find what packages it needs, and include those in any link step. Patch welcome! Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9938#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler