PatR 5224d85ad3 compile-time format checking ...

We've had a few pull requests fixing format/argument mismatches
lately.  I did't notice when PRINTF_F(format_index,first_arg_index)
attribute use and the checking gcc and clang do with it got removed,
but that was very useful.  Putting it back triggers a whole bunch
of "format string is not literal" warnings, but that's because
'-Wformat-nonliteral' was explicitly added to the *.2020 hints.
Checking pline/You/&c arguments in the cases where the format is a
literal is more valuable than the complaints for sprintf being fed
a generated format, so reinstate PRINTF_F usage and turn off the
check for non-literal format strings.

2021-11-26 21:50:44 -08:00

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