[LLVMbugs] [Bug 19437] New: DWARF4 low_pc relative encoding of high_pc is not supported by MacOS dtrace utility

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19437

            Bug ID: 19437
           Summary: DWARF4 low_pc relative encoding of high_pc is not
                    supported by MacOS dtrace utility
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: dblaikie at gmail.com
                CC: aprantl at apple.com, echristo at gmail.com,
                    llvmbugs at cs.uiuc.edu, nicolasweber at gmx.de
    Classification: Unclassified

LLVM now generates a non-relocatable constant value of high_pc which is a
constant offset relative to low_pc.

This is a DWARF4 feature, correctly disabled with -gdwarf-3 or lower.

But this seems to disagree with MacOS dtrace which probably hasn't been taught
to handle it.

For now, until a fixed dtrace is made available (perhaps someone can file that
dtrace radar?) I assume this optimization will need to be disabled on MacOS.

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