hsc2hs broken due to incorrect argument passing to the hsc2hs executable
Currently packages with .hsc files can't be built with GHC HEAD on some systems becuase of a problem in hsc2hs wrapper script. I don't understand the problem good enough, but we did some debugging with hvr today and he asked me to file a ticket. Here's how to reproduce:
regex-posix-0.95.2 $ cabal new-build --with-ghc=/home/omer/haskell/ghc/inplace/bin/ghc-stage2 Warning: Unknown/unsupported 'ghc' version detected (Cabal 126.96.36.199 supports 'ghc' version < 8.7): /home/omer/haskell/ghc/inplace/bin/ghc-stage2 is version 8.7.20181017 Warning: The package list for 'hackage.haskell.org' is 22 days old. Run 'cabal update' to get the latest list of available packages. Resolving dependencies... Build profile: -w ghc-8.7.20181017 -O1 In order, the following will be built (use -v for more details): - regex-posix-0.95.2 (lib:regex-posix) (first run) Warning: regex-posix.cabal:6:1: The field "build-type" is specified more than once at positions 6:1, 19:1 Configuring regex-posix-0.95.2... Preprocessing library for regex-posix-0.95.2.. hsc2hs: @/home/omer/haskell/regex-posix-0.95.2/dist-newstyle/build/x86_64-linux/ghc-8.7.20181017/regex-posix-0.95.2/build/Text/Regex/Posix/hsc2hs-response17101-2.txt: openBinaryFile: does not exist (No such file or directory)
As far as I understand, the problem is that the script runs
hsc2hs -- @foo instead of
hsc2hs @foo. Hopefully hvr will correct if I misunderstood.