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* Use pc_from_ucontext.m4 from Google Performance Tools•••This M4 module lets us learn the right way (out of at least 18 possibilities) to extract the current PC for stack-trace-fixup-in-signal purposes. The Google Performance Tools license is 3-clause BSD. Nick Mathewson2013-11-18
* Use a nicely written autoconf macro to determine the sign of a type•••This beats our old implementation, which wouldn't work when cross-compiling Nick Mathewson2013-02-07