https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4210
--- Comment #36 from Niels Möller <nisse at lysator dot liu.se> --- (In reply to Martin Sebor from comment #34) > > The front ends can eliminate simple subexpressions (as in '0 ? x >> 32 : x > >> 1') but they don't do the same for statements. Moving the warning from > the front end to some later pass would avoid diagnosing code in those cases > (it would also avoid duplicating the same code between different front > ends). The earliest is probably gimplify.c. That would avoid warning on > statements rendered dead as a result of constant expressions (as defined by > the language) but not [...] Thanks. So moving the warning to the gimplify pass would be an improvement over the current situation. Maybe I can try it out, it sounds reasonably simple.
