[issue8863] Segfault handler: display Python backtrace on segfault

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

New version of the patch:
 - catch also SIGFPE
 - add segfault.o to Makefile.pre.in
 - use abort() to quit instead of _exit(1)
 - call DebugBreak() on Windows before the abort(), as done by Py_FatalError()

TODO: Patch configure to only enable segfault handler if sigaltstack() is available. The alternate stack is maybe not needed for the SIGFPE handler.

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Added file: http://bugs.python.org/file17717/segfault_handler-2.patch

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