Add ATTRIBUTE_NORETURN and ATTRIBUTE_COLD

ATTRIBUTE_NORETURN is supported on all platforms (MSVS and GCC-like).
It declares that a function will not return; instead, the thread or
the whole process will terminate.

ATTRIBUTE_COLD is supported starting with GCC 4.3. It declares that
a function is supposed to be executed rarely. Rarely used error-handling
functions and functions that emit messages to the error log should be
tagged such.

include/my_compiler.h

@@ -148,6 +148,29 @@ struct my_aligned_storage
 #define MY_ALIGNED(size)
 #endif
 
+#ifdef __GNUC__
+# define ATTRIBUTE_NORETURN __attribute__((noreturn))
+# if MY_GNUC_PREREQ(4,3)
+/** Starting with GCC 4.3, the "cold" attribute is used to inform the
+compiler that a function is unlikely executed.  The function is
+optimized for size rather than speed and on many targets it is placed
+into special subsection of the text section so all cold functions
+appears close together improving code locality of non-cold parts of
+program.  The paths leading to call of cold functions within code are
+marked as unlikely by the branch prediction mechanism.  optimize a
+rarely invoked function for size instead for speed. */
+#  define ATTRIBUTE_COLD __attribute__((cold))
+# endif
+#elif defined _WIN32
+# define ATTRIBUTE_NORETURN __declspec(noreturn)
+#else
+# define ATTRIBUTE_NORETURN /* empty */
+#endif
+
+#ifndef ATTRIBUTE_COLD
+# define ATTRIBUTE_COLD /* empty */
+#endif
+
 #include <my_attribute.h>
 
 #endif /* MY_COMPILER_INCLUDED */