http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56958
--- Comment #3 from lucdanton at free dot fr 2013-04-28 00:37:37 UTC ---
I do make use of the variable in the pack; that the pack may be empty for some
instantiations may or may not be something to look out for, but I don't think
that it should be done by the unused variable warning.
Perhaps I misunderstand the role of warning -- to me the 'used' in 'unused
variable' means that it's conceptually used, not that it's e.g. ODR-used or any
technical sense of the term. Should the following code warn? Who does that
benefit?
int spurious = 0
if(1) return 0;
// never reached -- is spurious used or not?
return spurious + 3;
Since GCC doesn't warn for this I thought it shouldn't in the case of the pack
expansion.
