[GHC] #8561: Clang/iOS: __builtin___clear_cache doesn't exist in clang, use __clear_cache instead

[GHC]

#8561: Clang/iOS: __builtin___clear_cache doesn't exist in clang, use
__clear_cache instead
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        Reporter:  lukexi            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  high              |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Other             |     Architecture:  Unknown/Multiple
 Type of failure:  Building GHC      |       Difficulty:  Easy (less than 1
  failed                             |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by lukexi):

 OK, thanks for that! I'm running a build now with
 {{{
 #if defined(ios_HOST_OS) || defined (darwin_HOST_OS)
 void sys_icache_invalidate(void *start, size_t len);
 #endif

 /* Synchronize data/instruction cache. */
 void clearCache(void *start, void *end)
 {
 #if defined(ios_HOST_OS) || defined (darwin_HOST_OS)
   sys_icache_invalidate(start, (char *)end-(char *)start);
 #elif defined(__GNUC__)
   __builtin___clear_cache(start, end);
 #else
 #error "Missing builtin to flush instruction cache"
 #endif
 }}}

 adapted from that to test

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8561#comment:3>
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