Erik de Castro Lopo 195470fe2e Add configure option to enable GNU GCC stack smash protection.
This option is disabled by default because it is known not to work
on FreeBSD 9.1 and for Linux -> Windows cross compiling using the
Debian MinGW-w64 tool chain.

It is known to work for native compiles in Debian testing and
OpenBSD 5.2.
2013-03-13 18:59:50 +11:00
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