[LLVMbugs] [Bug 290] NEW: Bugpoint doesn't support uses of external fns by immediate constant exprs

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.cs.uiuc.edu/bugs/show_bug.cgi?id=290

           Summary: Bugpoint doesn't support uses of external fns by
                    immediate constant exprs
           Product: tools
           Version: trunk
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: bugpoint
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: gaeke+bugs at uiuc.edu


I hit the "UNSUPPORTED: external function used as a global initializer!" abort in bugpoint today, and I 
think a relatively simple enhancement to make would be to support things like
   %tmp.16 = call %struct.line* (...)* cast (%struct.line* ()*  %next_active_node to %struct.line* (...)*)( )
You get things like this when you have K&R style function prototypes.

We could attack this by specifically checking for constant cast exprs that are not wrapped in anything 
and only used in a single call instruction. But a more general solution would be to check that the 
function's use is a constant expr such that
 1) the constant expr has only one use
 2) the constant expr's use is either
      a) an instruction, or
      b) a constant expr conforming to 1) & 2).



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