Windows: Using hsc2hs in combination with inline-c generates the .c files with invalid paths

Repro steps:

• Install Stack on a Windows development machine.
• Create new simple project with stack new inlinecbug simple.
• Rename src/Main.hs to src/Main.hsc in the inlinecbug project directory.
• Build project with stack build and run with stack exec inlinecbug to verify that hsc2hs works correctly.
• Replace content of src/Main.hsc with following:

{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE TemplateHaskell #-}

import qualified Language.C.Inline as C

C.include "<math.h>"

main :: IO ()
main = do
  x <- [C.exp| double{ cos(1) } |]
  print x

• In inlinecbug.cabal add inline-c to the build-depends section of executable inlinecbug.
• Add the line c-sources: src/Main.c to the executable inlinecbug section.
• Rebuild with stack build.

Build will fail with a linker error referring to a undefined reference to an inline_c_main... function. List the files in the root directory of the project and you'll see that inline-c has generated a file with the name srcMain.c: i.e. the backslashes in the Windows path have been removed.

Building under Linux generates the C output file with the correct, expected path of src/Main.c and the program will compile, link and run as expected.

See also: https://github.com/fpco/inline-c/issues/50