From: Owen Shepherd <owen.shepherd@e43.eu>
Date: Sun, 30 Dec 2012 22:55:11 +0000 (+0000)
Subject: Add _PDCLIB_UNREACHABLE (defines block of code as unreachable) and _PDCLIB_UNDEFINED... 
X-Git-Url: https://pd.if.org/git/?p=pdclib.old;a=commitdiff_plain;h=42b55f2fe048f172af302c43e83733b2344854cc

Add _PDCLIB_UNREACHABLE (defines block of code as unreachable) and _PDCLIB_UNDEFINED(var) (defines the contents of the passed variable to be undefined) macros to _PDCLIB_aux.h
---

diff --git a/internals/_PDCLIB_aux.h b/internals/_PDCLIB_aux.h
index bc13897..c3e38d0 100644
--- a/internals/_PDCLIB_aux.h
+++ b/internals/_PDCLIB_aux.h
@@ -181,6 +181,15 @@
     #define _PDCLIB_DEPRECATED __attribute__ ((__deprecated__))
 #endif
 
+#if !defined(_PDCLIB_UNREACHABLE) && _PDCLIB_GCC_BUILTIN(__builtin_unreachable, 4, 0)
+    #define _PDCLIB_UNREACHABLE __builtin_unreachable()
+#endif
+
+#if !defined(_PDCLIB_UNDEFINED) && defined(__GNUC__)
+    #define _PDCLIB_UNDEFINED(_var) \
+        do { __asm__("" : "=X"(_var)); } while(0)
+#endif
+
 /* No-op fallbacks */
 
 #ifndef _PDCLIB_nothrow
@@ -224,6 +233,14 @@
     #define _PDCLIB_DEPRECATED
 #endif
 
+#ifndef _PDCLIB_UNREACHABLE
+    #define _PDCLIB_UNREACHABLE do {} while(0)
+#endif
+
+#ifndef _PDCLIB_UNDEFINED
+    #define _PDCLIB_UNDEFINED(_var) do {} while(0)
+#endif
+
 /*#if _PDCLIB_C_VERSION != 1999
 #error PDCLib might not be fully conforming to either C89 or C95 prior to v2.x.
 #endif*/