$NetBSD: patch-src_zm_signal_cpp,v 1.1 2015/04/10 02:58:49 dsainty Exp $

Don't assume machine-dependent IP register details are available for any
platform except Linux.  Only Linux is sure to have this style of mcontext_t.

Resolves build on systems that have ucontext_t but an mcontext_t that
doesn't look like Linux.

--- src/zm_signal.cpp.orig	2015-04-09 19:15:46.423693213 +1200
+++ src/zm_signal.cpp	2015-04-09 19:18:25.475699808 +1200
@@ -66,10 +66,14 @@
 		ucontext_t *uc = (ucontext_t *) context;
 #if defined(__x86_64__)
 		cr2 = info->si_addr;
+#if defined(__linux__)
 		ip = (void *)(uc->uc_mcontext.gregs[REG_RIP]);
+#endif // defined(__linux__)
 #else
 		cr2 = info->si_addr;
+#if defined(__linux__)
 		ip = (void *)(uc->uc_mcontext.gregs[REG_EIP]);
+#endif // defined(__linux__)
 #endif				// defined(__x86_64__)
 
 		// Print the signal address and instruction pointer if available