[Bug c/106416] -Wint-conversion should be an error, not a pedwarn

[fw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106416

Florian Weimer <fw at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |fw at gcc dot gnu.org

--- Comment #1 from Florian Weimer <fw at gcc dot gnu.org> ---
This will likely need the same preparatory treatment as rejecting implicit
function declarations (bug 91092), for the same reason: Without some care
upfront, introducing the new compiler error will change configure test results
in fully consistent ways, resulting in silently dropped features.