[PATCH] Make the ODR detector emit errors instead of warnings

[Jeffrey Yasskin]

In a large build, it can be very easy to miss a link that emitted
warnings. Errors are much harder to miss, and seem appropriate for
problems that cause undefined behavior. If there are false positives,
users can avoid passing --detect-odr-violations on that link line.

2010-07-22  Jeffrey Yasskin  <jyasskin@google.com>

	* symtab.cc (Symbol_table::detect_odr_violations): Change warning to error.
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