introduce UNREACHABLE() macro.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@3300 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/cfg/compiler.h b/bertos/cfg/compiler.h
index 5cacf1dca66fe20041b8e2fa0aa5133b66aad3d0..bd60c6e79b74f534688c4816526126f835cb2ef7 100644 (file)
--- a/bertos/cfg/compiler.h
+++ b/bertos/cfg/compiler.h
@@ -190,6 +190,10 @@
                #define DEPRECATED  __attribute__((__deprecated__))
        #endif
 
+       #if GNUC_PREREQ(4,5)
+               #define UNREACHABLE() __builtin_unreachable()
+       #endif
+
        #ifndef __cplusplus
                #define ASSERT_TYPE_EQUAL(var1, var2) \
                        STATIC_ASSERT(__builtin_types_compatible_p(typeof(var1), typeof(var2)))
@@ -323,6 +327,9 @@
 #define MEMORY_BARRIER         /* nothing */
 #warning No memory barrier defined for select compiler. If you use the kernel check it.
 #endif
+#ifndef UNREACHABLE
+#define UNREACHABLE() for (;;)
+#endif
 
 
 /* Misc definitions */