[boost] [context] a couple of build fixes for Solaris (10)

Subject: [boost] [context] a couple of build fixes for Solaris (10)
From: Luke Elliott (lukester_null_at_[hidden])
Date: 2012-07-06 09:12:05

First is to get the definition of mprotect() that takes void * rather
than char * by defining _XPG4_2, which causes a compilation failure with
Solaris Studio 12.3.

Second is a workaround for a bug in their csignal header which uses the
same include guard that signal.h uses, which csignal includes (leaving
SIGSTKSZ undefined).

Attached if of any help.

Regards

Luke Elliott.