https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88738
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-01-12
CC| |msebor at gcc dot gnu.org
Component|c++ |libstdc++
Ever confirmed|0 |1
Severity|normal |enhancement
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Annotating std::operator==(shared_ptr, nullptr_t) with attribute
warn_unused_result is enough to give a warning for the test case in comment #0.
Handling the test case in comment #1 is a bit more involved because GCC doesn't
issue -Wunused-variable warnings for objects of classes with ctors/dtors, so it
will likely take a compiler enhancement (say, an attribute to request such
warnings for classes whose user-defined ctors and dtors have no side-effects).
I've changed the Component to libstdc++ since that's the easy part (and will
let the library maintainers more quickly chime in on if it's doable and when).
