On Thu, 2008-12-25 at 15:17 +0900, Curt Sampson wrote:
I'm trying to upgrade from ghc 6.8.3 to 6.10.1. Unfortunately, there seem to be problems with the Windows version. (I've installed it on two different machines, both Windows XP, and they've both had the same problem. Both worked fine with 6.8.3.)
When I run hsc2hs, on an hsc file, I get the error, "Can't find gcc".
Just as an experiment, I tried adding c:\ghc\ghc-6.10.1 to my path. That lets it find gcc, but then it can't find cc1. If I go even further down this road and add c:\ghc\ghc-6.10.1\gcc-lib to my path, it can find cc1, but then I get a stream of errors about not being able to find header files, such as HsFFI.h.
Does anybody have any clues here to help me? I can provide code, or even access to the machine, if needed.
So here's the story: Up until ghc-6.10, ghc shipped a fork of hsc2hs. The forked version used ghc as the C compiler rather than gcc. This had the advantage that it would know about ghc packages and the include files shipped with packages. The disadvantage was that it was a fork and behaved differently than using hsc2hs with hugs. It also meant that real C compiler options had to be double-escaped to get hsc2hs to pass them to ghc and get ghc to pass them to gcc. In ghc-6.10, ghc ships the normal hsc2hs. What we did not notice before 6.10.1 was released was that calling hsc2hs on its own now does not work without passing additional flags. We never noticed because few people actually do call hsc2hs directly, it is typically used via Cabal. Cabal tells it where gcc lives and what include dirs to use. So that's why at the moment in the Windows installer, hsc2hs cannot even find gcc, because gcc is not on the %PATH% and hsc2hs does not know about ghc's special bundled version of gcc. It also does not know about ghc's include directories. It's clear we'll need to think a bit more about how to get hsc2hs to be both a compiler neutral tool where we can share a single instance between multiple compilers and also have it work "out of the box".
We're also happy to pay for support, if someone out there is offering commercial support for ghc.
We offer commercial support through Well-Typed: http://www.well-typed.com/ Duncan