> It's not obvious to me whether this belongs in -Wextra. After all, this > is a perfectly reasonable and useful GNU C feature, or at least some cases > of it are (like "#define FOO (BAR || defined something)"). Is the > argument that there are too many details of it that differ between > implementations, as discussed in section 3.2 of > <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4220.pdf>?
Yes, and in general it fits the group of "often annoying warnings, that people may nevertheless appreciate" that are already in -Wextra, for example -Wunused-parameter, -Wmissing-field-initializers or -Wshift-negative-value. Thanks, Paolo
