[PATCH] rtems: Improve RTEMS_NO_RETURN attribute

[Sebastian Huber]

Provide RTEMS_NO_RETURN also in case RTEMS_DEBUG is defined to prevent errors
like this:

error: no return statement in function returning non-void [-Werror=return-type]

Use C11 and C++11 standard means to declare a no-return function.

Close #4122.
---
 cpukit/include/rtems/score/basedefs.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/cpukit/include/rtems/score/basedefs.h b/cpukit/include/rtems/score/basedefs.h
index c31b4ebef7..0244af1471 100644
--- a/cpukit/include/rtems/score/basedefs.h
+++ b/cpukit/include/rtems/score/basedefs.h
@@ -94,9 +94,11 @@
  *  can impact the code generated following calls to
  *  rtems_fatal_error_occurred and _Terminate.
  */
-#if defined(RTEMS_SCHEDSIM)
-  #define RTEMS_NO_RETURN
-#elif defined(__GNUC__) && !defined(RTEMS_DEBUG)
+#if __cplusplus >= 201103L
+  #define RTEMS_NO_RETURN [[noreturn]]
+#elif __STDC_VERSION__ >= 201112L
+  #define RTEMS_NO_RETURN _Noreturn
+#elif defined(__GNUC__)
   #define RTEMS_NO_RETURN __attribute__((__noreturn__))
 #else
   #define RTEMS_NO_RETURN
-- 
2.26.2