From 535246269d4a7d8338320f8e6666ca887718c5d0 Mon Sep 17 00:00:00 2001
From: Brent Cook <busterb@gmail.com>
Date: Sat, 9 Feb 2019 09:03:13 -0600
Subject: [PATCH] add __dead__ annotation support

---
 CMakeLists.txt             | 1 +
 include/compat/sys/types.h | 8 ++++++++
 m4/check-os-options.m4     | 1 +
 3 files changed, 10 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4d54ada..a6a7554 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,6 +49,7 @@ endif()
 
 if(CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
 	add_definitions(-DHAVE_ATTRIBUTE__BOUNDED__)
+	add_definitions(-DHAVE_ATTRIBUTE__DEAD__)
 endif()
 
 if(CMAKE_SYSTEM_NAME MATCHES "Linux")
diff --git a/include/compat/sys/types.h b/include/compat/sys/types.h
index dec09e3..4967843 100644
--- a/include/compat/sys/types.h
+++ b/include/compat/sys/types.h
@@ -49,6 +49,14 @@ typedef SSIZE_T ssize_t;
 # define __bounded__(x, y, z)
 #endif
 
+#if !defined(HAVE_ATTRIBUTE__DEAD) && !defined(__dead)
+#ifdef _MSC_VER
+#define __dead      __declspec(noreturn)
+#else
+#define __dead      __attribute__((__noreturn__))
+#endif
+#endif
+
 #ifdef _WIN32
 #define __warn_references(sym,msg)
 #else
diff --git a/m4/check-os-options.m4 b/m4/check-os-options.m4
index 445bd74..84116a2 100644
--- a/m4/check-os-options.m4
+++ b/m4/check-os-options.m4
@@ -98,6 +98,7 @@ char buf[1]; getentropy(buf, 1);
 		HOST_OS=openbsd
 		HOST_ABI=elf
 		AC_DEFINE([HAVE_ATTRIBUTE__BOUNDED__], [1], [OpenBSD gcc has bounded])
+		AC_DEFINE([HAVE_ATTRIBUTE__DEAD], [1], [OpenBSD gcc has __dead])
 		;;
 	*mingw*)
 		HOST_OS=win