[GHC] #8562: Builtin function __builtin___clear_cache is unavailable on GCC 4.2

[GHC]

#8562: Builtin function __builtin___clear_cache is unavailable on GCC 4.2
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        Reporter:  heatsink                 |            Owner:  simonmar
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Runtime System           |          Version:  7.7
      Resolution:                           |         Keywords:
Operating System:  MacOS X                  |     Architecture:  x86_64
 Type of failure:  GHC doesn't work at all  |  (amd64)
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:  #8561
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"9fbb8c788d4bdf091709778b42a1294bbdabef95/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9fbb8c788d4bdf091709778b42a1294bbdabef95"
 Rejigger flushExec implementation (#8562, #8561)

 Instead, just don't do anything on x86/amd64, and on !x86, use either A)
 __clear_cache from libgcc, or B) sys_icache_invalidate for OS X (and
 iOS.)

 Signed-off-by: Austin Seipp <austin at well-typed.com>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8562#comment:4>
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