On Tue, Dec 13, 2016 at 2:50 PM, Jonathan Wakely <jwak...@redhat.com> wrote: > This patch allows the size of the emergency buffer for exception > handling to be controlled by a build-time macro (to avoid dynamic > allocation) or by a run-time environment variable (to allocate a > larger or smaller buffer). > > This will have to wait for the next stage 1 now, as it's too late for > GCC 7, but this shows what I'm thinking about and so might avoid > anybody else reinventing the wheel. > > The patch doesn't include documentation updates for the manual, which > would be needed to explain the use of the macro and the env var. We > could also add a --with-libstdcxx-static-eh-pool=N configure flag to > make it easier to set the macro.
Looks reasonable. But I wonder whether we'd want the default arena size to be configurable as well, thus split static-eh-pool=N into default-eh-pool-size=N and -static-eh-pool (without =N). Also maybe N should be the number of exception objects rather than bytes? Otherwise a target independent N is hard to specify for say, a distribution that wants either a different default or a static buffer. Richard. >
