[PATCH] Last-chance diagnostics for incomplete types

Luke Zarko zarko at google.com
Tue Jul 9 15:45:15 PDT 2013

This patch adds a method to ExternalSemaSource to allow it to produce
diagnostics when an incomplete type was detected where a complete type
was required. For example, one could define an ExternalSemaSource that
scans a repository for headers providing a missing definition.

The purpose of the MaybeDiagnoseMissingCompleteType method differs
from that of the existing  ExternalASTSource::CompleteType method. The
former is invoked to diagnose a single SourceLocation-ed
missing-complete-type site where there is no chance for recovery. The
latter may be called in the course of compiling a valid source file
with some of its definitions available in external but otherwise
available locations.
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