[GHC] #12111: prof build flavour doesn't work

[GHC]

#12111: prof build flavour doesn't work
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        Reporter:  osa1              |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Build System      |              Version:  8.0.1
      Resolution:  invalid           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 Actually, you do need to fiddle with `-fprof-auto` a little. See this
 comment in `compiler/ghc.mk`:
 {{{
 # If we're profiling GHC then we want SCCs.  However, adding -auto-all
 # everywhere tends to give a hard-to-read profile, and adds lots of
 # overhead.  A better approach is to proceed top-down; identify the
 # parts of the compiler of interest, and then add further cost centres
 # as necessary.  Turn on -fprof-auto for individual modules like this:

 # compiler/main/DriverPipeline_HC_OPTS += -fprof-auto
 compiler/main/GhcMake_HC_OPTS        += -fprof-auto
 compiler/main/GHC_HC_OPTS            += -fprof-auto

 # or alternatively add {-# OPTIONS_GHC -fprof-auto #-} to the top of
 # modules you're interested in.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12111#comment:4>
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