https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101645
John Hubbard <jhubbard at nvidia dot com> changed:
What |Removed |Added
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CC| |jhubbard at nvidia dot com
--- Comment #3 from John Hubbard <jhubbard at nvidia dot com> ---
Here are some data points in favor of adding this warning:
1) It's already desirable in a real project (Linux kernel, as Matthew pointed
out), and
2) Clang has already gone there, presumably for good reasons as well.
3) Anecdote: as an experienced C programmer, I can tell you that the "b(-x)"
results are rarely what a programmer would want, nor intend. (Of course, the
ideal is a perfect type-safe match between input and args, but that doesn't
always happen in real code.)
The compiler knows enough to significantly help here, by warning. It's also
possible to update the -Wsign-conversion documentation to match, if necessary,
let's not forget that.
