[GHC] #7660: warning: conflicting types when compiling via-C

[GHC]

#7660: warning: conflicting types when compiling via-C
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        Reporter:  singpolyma        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.7
      Resolution:                    |             Keywords:  warning
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hvr):

 Here's a minimal C fragment extracted from such a `.hc` file which
 triggers this warning:

 {{{#!c
 typedef void *(*(*StgFunPtr)(void))(void);

 extern StgFunPtr strlen();
 }}}

 If the main purpose of this is to get a pointer to primitives such as
 `strlen`, then we can use `-fno-builtin` to fix this warning (works w/
 clang & gcc).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7660#comment:7>
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