This feature is where the bootstrap compiler in buildworld is not built if the one in /usr/bin/cc matches what would be built. It is very conservative and requires a complete match of major/minor version and the compiler revision (__FreeBSD_cc_version).
The only complaint so far about this feature was that when we bumped the compiler revision, too much of clang would rebuild. That was addressed in r301277. I would like to enable this feature by default in head for 11.0. Unless there are any objections I will do so in a few days. -- Regards, Bryan Drewery
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