[Bug 207079] #include <signal.h> doesn't make ucontext_t available

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207079

            Bug ID: 207079
           Summary: #include <signal.h> doesn't make ucontext_t available
           Product: Base System
           Version: 10.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: freebsd-standards at FreeBSD.org
          Reporter: lantw44 at gmail.com

According to POSIX standard (
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html),
including signal.h should define the mcontext_t and the ucontext_t type.

However, this doesn't work on FreeBSD. Compiling this simple program:
#include <signal.h>
int main (int argc, char *argv[]) { ucontext_t u; }

causes this error to be showed:
<filename.c>:2:37: error: use of undeclared identifier 'ucontext_t'


This problem also causes the current WebKit trunk build to fail. Can this
problem be fixed, so we don't have to add a workaround for it in WebKit? I am
using FreeBSD 10.3-BETA1.

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