[PATCH] Allow DW_OP_GNU_uninit in dwarf_expr_require_composition

[Tom Tromey]

>>>>> "Andreas" == Andreas Arnez <arnez@linux.vnet.ibm.com> writes:

Andreas> You mean to allow DW_OP_GNU_uninit to terminate any simple
Andreas> location description?

Yes.

>> That is, assuming DW_OP_GNU_uninit is useful at all.
>> Another option would be to deprecate it.

Andreas> Right, I wonder about its usefulness as well.  For a variable
Andreas> with fixed location it may cover a small window where the
Andreas> compiler can be certain that the variable is uninitialized.  I
Andreas> guess this *might* be useful sometimes?

Andreas> Is there even a DWARF issue for this?  Or a formal
Andreas> specification?

I don't think so.  Last time I looked into this all I was able to find
were the patch submissions to gcc and gdb.  IIRC they weren't all that
informative though.

Tom