[Bug driver/91406] gcc -Q -v lies about what flags are enabled

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91406

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
-Q -v is only a wild guess given whether options are enabled or disabled may
depend on the function context.  There's really no way to implement it
accurately
(this -1 trick for "auto-detection" could eventually be handled in some
generic way, saying not enabled/disabled but "<auto>" or "<unknown>")