#3711: Bad error reporting when calling a function in a module which depends on
a
DLL on Windows
---------------------------------+------------------------------------------
Reporter: fasta | Owner:
Type: bug | Status: new
Priority: normal | Component: GHCi
Version: 6.10.4 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: None/Unknown
---------------------------------+------------------------------------------
When you try to call a function which depends on a DLL, after the module
has been loaded in ghci, you get:
Loading package Codec-Image-DevIL-0.1 ... can't load .so/.DLL for: ILU
(addDLL: could not load DLL)
This error message is almost completely useless. It should call
GetLastError() and present this information to the user.
I don't know whether the error message for GetLastError is actually
useful, but otherwise it should derive a real problem with the library,
e.g. "we searched for it in the PATH, but we couldn't find it, or the
library format is wrong(use Dependency walker to verify that this is a
valid Windows DLL), etc.".
In general every error message should state what it tried and why it
failed. In the same sense that type-error messages do (assuming no bugs in
the type-inferencer ;) ).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3711>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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