COMMON: Move NORETURN_* defines into their own noreturn.h

So that we can use these macros without pulling in the rest of the
defines in system.h.

src/common/noreturn.h

@@ -0,0 +1,42 @@
+/* xoreos - A reimplementation of BioWare's Aurora engine
+ *
+ * xoreos is the legal property of its developers, whose names
+ * can be found in the AUTHORS file distributed with this source
+ * distribution.
+ *
+ * xoreos is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * xoreos is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with xoreos. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file
+ *  Compiler-specific defines to declare a function non-returning.
+ */
+
+#ifndef COMMON_NORETURN_H
+#define COMMON_NORETURN_H
+
+#if defined(_MSC_VER)
+	#define NORETURN_PRE __declspec(noreturn)
+#elif defined(__GNUC__)
+	#define NORETURN_POST __attribute__((__noreturn__))
+#endif
+
+#ifndef NORETURN_PRE
+	#define NORETURN_PRE
+#endif
+
+#ifndef NORETURN_POST
+	#define NORETURN_POST
+#endif
+
+#endif // COMMON_NORETURN_H

src/common/rules.mk

@@ -24,6 +24,7 @@ src_common_libcommon_la_SOURCES =
 
 src_common_libcommon_la_SOURCES += \
     src/common/system.h \
+    src/common/noreturn.h \
     src/common/types.h \
     src/common/endianness.h \
     src/common/maths.h \

src/common/system.h

@@ -54,6 +54,8 @@
 	#include "config.h"
 #endif
 
+#include "src/common/noreturn.h"
+
 #if defined(_MSC_VER)
 
 	#include <cstdarg>
@@ -78,7 +80,6 @@
 	#endif
 
 	#define FORCEINLINE __forceinline
-	#define NORETURN_PRE __declspec(noreturn)
 	#define PLUGIN_EXPORT __declspec(dllexport)
 
 	static FORCEINLINE int c99_vsnprintf(char *str, size_t size, const char *format, va_list ap) {
@@ -141,7 +142,6 @@
 // GCC specific stuff
 //
 #if defined(__GNUC__)
-	#define NORETURN_POST __attribute__((__noreturn__))
 	#define PACKED_STRUCT __attribute__((__packed__))
 	#define GCC_PRINTF(x,y) __attribute__((__format__(printf, x, y)))
 
@@ -403,14 +403,6 @@
 	#define FORCEINLINE inline
 #endif
 
-#ifndef NORETURN_PRE
-	#define NORETURN_PRE
-#endif
-
-#ifndef NORETURN_POST
-	#define NORETURN_POST
-#endif
-
 #ifndef STRINGBUFLEN
 	#define STRINGBUFLEN 1024
 #endif