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Companion library to liberror. It enables backtrace
support for liberror.
The library need only be linked, together with -ldw
(from libelf) and -lunwind (libunwind), there is no
header file or any functions the user should use.
Note however, for static linking you may need
-Wl,--whole-archive before and -Wl,--no-whole-archive
after the library when linking; for dynamic linking,
put -lerror-backtrace before -lerror, alternative
the library can be loaded with LD_PRELOAD if liberror
is dynamic linked.
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