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The result of linemap_resolve_location() can be an ad-hoc location, if that is what was stored in a relevant macro map. maybe_unwind_expanded_macro_loc() did not previously handle this case, causing it to print the wrong tracking information for an example such as the new testcase macro-trace-1.c. Fix that by checking for ad-hoc locations where needed. gcc/ChangeLog: * tree-diagnostic.cc (maybe_unwind_expanded_macro_loc): Handle ad-hoc location in return value of linemap_resolve_location(). gcc/testsuite/ChangeLog: * c-c++-common/cpp/macro-trace-1.c: New test.
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