Merge pull request #10837 from kjbracey-arm/toolchain11

Toolchain attributes - use C++11/C11

Author: 0xc0170

platform/mbed_assert.h

@@ -124,8 +124,14 @@ do {                                                     \
  *  };
  *  @endcode
  */
-#define MBED_STRUCT_STATIC_ASSERT(expr, msg) int : (expr) ? 0 : -1
-
+#if defined(__cplusplus) && (__cplusplus >= 201103L || __cpp_static_assert >= 200410L)
+#define MBED_STRUCT_STATIC_ASSERT(expr, msg) static_assert(expr, msg)
+#elif !defined(__cplusplus) && __STDC_VERSION__ >= 201112L
+#define MBED_STRUCT_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg)
+#else
+#include <stdbool.h>
+#define MBED_STRUCT_STATIC_ASSERT(expr, msg) bool : (expr) ? 0 : -1
+#endif
 
 #endif
 

platform/mbed_toolchain.h

@@ -72,7 +72,11 @@
  *  @endcode
  */
 #ifndef MBED_ALIGN
-#if defined(__ICCARM__)
+#if __cplusplus >= 201103 && !defined __CC_ARM
+#define MBED_ALIGN(N) alignas(N)
+#elif __STDC_VERSION__ >= 201112 && !defined __CC_ARM
+#define MBED_ALIGN(N) _Alignas(N)
+#elif defined(__ICCARM__)
 #define MBED_ALIGN(N) _Pragma(MBED_STRINGIFY(data_alignment=N))
 #else
 #define MBED_ALIGN(N) __attribute__((aligned(N)))
@@ -298,7 +302,11 @@
  *  @endcode
  */
 #ifndef MBED_NORETURN
-#if defined(__GNUC__) || defined(__clang__) || defined(__CC_ARM)
+#if __cplusplus >= 201103
+#define MBED_NORETURN [[noreturn]]
+#elif __STDC_VERSION__ >= 201112
+#define MBED_NORETURN _Noreturn
+#elif defined(__GNUC__) || defined(__clang__) || defined(__CC_ARM)
 #define MBED_NORETURN __attribute__((noreturn))
 #elif defined(__ICCARM__)
 #define MBED_NORETURN __noreturn