https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61659
Bug ID: 61659
Summary: Extra undefined symbol because of devirtualization
Product: gcc
Version: 4.10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: rafael.espindola at gmail dot com
CC: hubicka at gcc dot gnu.org
Given
struct generic_parser_base {
virtual void getOption();
void getExtraOptionNames() { getOption(); }
};
template <class DataType> struct parser : public generic_parser_base {
virtual void getOption() {}
};
struct PassNameParser : public parser<int> {
PassNameParser();
};
struct list {
PassNameParser Parser;
virtual void getExtraOptionNames() { return Parser.getExtraOptionNames(); }
};
list PassList;
gcc 4.9 and trunk will produce an undefined reference to
_ZN6parserIiE9getOptionEv (parser<int>::getOption()) which suggest that the
template is not being instantiated when the call is devirtualized.
Using -fno-devirtualize avoids the bug.
