[GHC] #16131: -ddump-cmm doesn't work when compiling cmm files

[GHC]

#16131: -ddump-cmm doesn't work when compiling cmm files
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           Reporter:  osa1           |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Compiler       |           Version:  8.6.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 I want to see Cmm generated for `StgMiscClosures.cmm` so I tried adding
 `-ddump-cmm` to the command the build system runs to build it, which
 doesn't work:

 {{{
 $ "inplace/bin/ghc-stage1" -static -O0 -H64m -Wall -Iincludes
 -Iincludes/dist -Iincludes/dist-derivedconstants/header -Iincludes/dist-
 ghcconstants/header -Irts -Irts/dist/build -DCOMPILING_RTS
 -DFS_NAMESPACE=rts -this-unit-id rts -dcmm-lint -i -irts -irts/dist/build
 -Irts/dist/build -irts/dist/build/./autogen -Irts/dist/build/./autogen -O2
 -Wcpp-undef -Wnoncanonical-monad-instances -c rts/StgMiscClosures.cmm -o
 rts/dist/build/StgMiscClosures.o -fforce-recomp -ddump-cmm
 }}}

 Why do I need cmm dumps of cmm files?

 - When building Cmm even the parser does code generation, so the Cmm after
 parsing is quite different than the input and contains useful information.
 - I want all macros to be expanded, running CPP manually is painful.
 - I currently can't see output of Cmm optimisations when building Cmm
 files.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16131>
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