Solaris targets support the cmn_err (or __cmn_err__) format check. cmn_err accepts a subset of the standard printf conversions, and the two-argument %b conversion for displaying bit-fields. See the Solaris man page for cmn_err for more information.
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https://gcc.gnu.org/onlinedocs/gcc-10.2.0/gcc/Solaris-Format-Checks.html