"ghc -C" failed

[guest]

--- source file --- module Main where

main = return ()

--- command line --- E:\DANE\wisnipr2\Temp>ghc -C Main.hs

addFlag by -C on the commandline:

Warning: The -fvia-C flag does nothing; it will be removed in a future GHC release

ghc: panic! (the 'impossible' happened)

(GHC version 7.4.1 for i386-unknown-mingw32):

pipeLoop: at phase As but I wanted to stop at phase HCc

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

[simonmar]

This was briefly fixed (I think it might be fixed in 7.6.1) and then broken again by:

commit f917eeb824cfb7143dde9b12e501d4ddb0049b65

Author: Ian Lynagh <ian@well-typed.com>
Date:   Tue Aug 7 01:27:44 2012 +0100

    Add "Unregisterised" as a field in the settings file
    
    To explicitly choose whether you want an unregisterised build you now
    need to use the "--enable-unregisterised"/"--disable-unregisterised"
    configure flags.

[goldfire]

This panic is also triggered by building GHC with the following in build.mk:

GhcLibWays = v p dyn p_dyn

Here is the error:

  ...
  rts_dist_HC rts/dist/build/posix/Signals.
  rts_dist_HC rts/dist/build/posix/TTY.
  rts_dist_HC rts/dist/build/Apply.hc

addFlag by -C on the commandline: Warning:
    The -fvia-C flag does nothing; it will be removed in a future GHC release
ghc-stage1: panic! (the 'impossible' happened)
  (GHC version 7.7.20121002 for x86_64-apple-darwin):
	pipeLoop: at phase As but I wanted to stop at phase HCc

If it matters, I'm compiling on Mac OS 10.7.5 and using GHC 7.6.1.

[igloo]

I've just validated on OS X x86_64 with GhcLibWays = v p dyn p_dyn, so I think recent changes have fixed this. Please reopen if you still have problems.