Mike Frysinger a1d9117f94 sim: callback: add printf attributes
This helps these funcs get printf format checking coverage.

The sim-io.c hack as a result is a bit unfortunate, but the compiler
throws warnings when printing with empty strings.  In this one case,
we actually want that due to the side-effect of the callback halting
execution for us.
2021-06-29 02:14:58 -04:00
..
2021-06-28 11:30:47 -04:00
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