Karl-Johan Karlsson ea92b1f9d0 [Sema] Implement support for -Wformat-signedness (#74440) ...

In gcc there exist a modifier option -Wformat-signedness that turns on
additional signedness warnings in the already existing -Wformat warning.

This patch implements that support in clang. This is done by adding a dummy
warning diag::warn_format_conversion_argument_type_mismatch_signedness that
is never emitted and only used as an option to toggle the signedness warning
in -Wformat. This will ensure gcc compatibility.

2024-03-31 11:09:52 +02:00

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