gen-num-limits.cc & signal handling

[Gabriel Dos Reis]

Mark Kettenis <kettenis@wins.uva.nl> writes:

[...]

|    Could you send a patch so that other port-maintainers can test?
| 
| Here it is.  If libstdc++-v3 is ever ported to a system that doesn't
| have siglongjmp() and sigsetjmp() an autoconf check for those function
| could, and the program could fall on longjmp() and setjmp() if they're
| not available, as indicated by the comment I added.
| 
| I'd appreciate it if the Cygwin folks could test this.  I removed the
| Cygwin specific code, but I'm not entirely sure whether using
| siglongjmp() really makes all of the ripped out code obsolete.

This is fine, please install it.

-- Gaby
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