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Chris Tate
377af617d3
With --exceptions=rare, recursive functions and functions up to three calls above a throw also propagate exceptions by unwinding on Linux, so calls to them need no pending-flag test. Functions with a throw of their own keep the flag. The default, common, keeps the current rules, and builds without the flag emit the same code as before. The option is part of the executable cache key; the bootstrap's cached route leaves builds with it to the full compiler, and coverage and library builds refuse it.