$NetBSD: patch-src_zm_signal_cpp,v 1.2 2020/08/25 16:42:21 gdt 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	2016-02-03 18:40:30.000000000 +0000
+++ src/zm_signal.cpp
@@ -69,13 +69,17 @@ RETSIGTYPE zm_die_handler(int signal)
 	#ifdef __FreeBSD_kernel__
 		ip = (void *)(uc->uc_mcontext.mc_rip);
 	#else
+		#if defined(__linux__)
 		ip = (void *)(uc->uc_mcontext.gregs[REG_RIP]);
+		#endif
 	#endif
 #else
 	#ifdef __FreeBSD_kernel__
 		ip = (void *)(uc->uc_mcontext.mc_eip);
 	#else
+		#if defined(__linux__)
 		ip = (void *)(uc->uc_mcontext.gregs[REG_EIP]);
+		#endif
 	#endif
 #endif				// defined(__x86_64__)