C++ PATCH for c++/66543 (-Wunused-but-set false positives)

Jason Merrill jason@redhat.com
Tue Apr 19 19:29:00 GMT 2016


We've been seeing false positives from these warnings in template code 
due to uses not making it through into the instantiation:

1) If a pack expansion has no elements
2) If a parameter used in a trailing-return-type is instantiated into a 
dummy distinct from the real instantiation
3) If a generic lambda that refers to the decl is never instantiated

Tested x86_64-pc-linux-gnu, applying to trunk.
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