[C2hs] Building Projects under mingw that use c2hs [apologies for repost; archive seemed to scrub text portion, see archive for attached file]

Alexander McPhail haskell.vivian.mcphail at gmail.com
Sat Apr 7 09:45:20 EDT 2007


I have been trying to build a Cabal package that uses c2hs under mingw and
have run into some problems.

1) c2hs needed its own options because it has to pass a flag to its
invocation of the CPP.  I have already submitted this patch.  (I also
noticed a request for cppOptions in the Cabal.cabal file, so I added that)

2) When c2hs generates the
          foreign import ccall unsafe "path/to/include.h function" :: Type
    it doesn't insert the appropriate number of path separators for windows
( i.e. \\ not \)
    I have this patch sitting in my copy of c2hs.  But what I did is really
    at around line 567 (process :: FilePath -> FilePath -> CST s ())
    I inserted:
    >    outFName' <- getSwitch outputSB
    >    -- on windows the path separator needs to be "\\" not "\"
    >    let outFName = replaceFileSeparator outFName'

    where replaceFileSeparator is defined as:
    >    replaceFileSeparator :: String -> String
    >    replaceFileSeparator []      = []
    >    replaceFileSeparator (x:xs)
    >       | x == '\\'           = "\\\\" ++ (replaceFileSeparator xs)
    >       | otherwise           = x : (replaceFileSeparator xs)

    this fixes the problem but stinks.

3) when compiling my c2hs generated .hs file, the c2hs generated .h file is
not being found.

$ ./Setup.lhs -v build
Reading parameters from
Preprocessing library Mingw-c2hs-cabal-test-0.0.1...
D:\Apps\MSYS\1.0\local\bin\c2hs.exe -C -D__GLASGOW_HASKELL__=606 -C
-I..\include --cppopts=-I../include --include=src -o src\Cabal\MingwTest.hs
D:\Apps\MSYS\1.0\local\bin\c2hs.exe -C -D__GLASGOW_HASKELL__=606 -C
-I..\include --cppopts=-I../include --include=src -o src\Cabal\MingwTest2.hs
Building Mingw-c2hs-cabal-test-0.0.1...
d:\Apps\ghc\ghc- 6.6\bin\ghc.exe -package-name
Mingw-c2hs-cabal-test-0.0.1--make -hide-all-packages -i
-idist\build\autogen -i. -isrc -I..\include
-#include "test.h" -odir dist\build -hidir dist\build -package base-2.0 -O
-package haskell98 -fglasgow-exts -fffi Cabal.MingwTest Cabal.MingwTest2C2HS
[1 of 3] Compiling C2HS             ( src/C2HS.hs, dist\build/C2HS.o )
[2 of 3] Compiling Cabal.MingwTest  ( src/Cabal/MingwTest.hs,
dist\build/Cabal/MingwTest.o )
src\Cabal\MingwTest.h: No such file or directory

I have attached a set of files that will generate the errors I have
mentioned on mingw.


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