Here during overload resolution we have two strictly viable ambiguous candidates #1 and #2, and two non-strictly viable candidates gcc-mirror#3 and gcc-mirror#4 which we hold on to ever since r14-6522. These latter candidates have an empty second arg conversion since the first arg conversion was deemed bad, and this trips up joust when called on gcc-mirror#3 and gcc-mirror#4 which assumes all arg conversions are there. We can fix this by making joust robust to empty arg conversions, but in this situation we shouldn't need to compare gcc-mirror#3 and gcc-mirror#4 at all given that we have a strictly viable candidate. To that end, this patch makes tourney shortcut considering non-strictly viable candidates upon encountering ambiguity between two strictly viable candidates (taking advantage of the fact that the candidates list is sorted according to viability via splice_viable). PR c++/115239 gcc/cp/ChangeLog: * call.cc (tourney): Don't consider a non-strictly viable candidate as the champ if there was ambiguity between two strictly viable candidates. gcc/testsuite/ChangeLog: * g++.dg/overload/error7.C: New test. Reviewed-by: Jason Merrill <jason@redhat.com> (cherry picked from commit 7fed7e9)

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[libstdc++?] Inappropriate exit cleanup in C++ #1

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