rtems/score/assert.h: Rework to allow use of NDEBUG

cpukit/score/include/rtems/score/assert.h

@@ -30,22 +30,52 @@ extern "C" {
  * NDEBUG.
  */
 #if defined( RTEMS_DEBUG )
-  #if !defined( RTEMS_SCHEDSIM )
-    /* __ASSERT_FUNC is newlib. */
-    #define _Assert( _e ) \
-      ( ( _e ) ? \
-        ( void ) 0 : \
-          __assert_func( __FILE__, __LINE__, __ASSERT_FUNC, #_e ) )
-  #else
-    /* __ASSERT_FUNCTION is glibc. */
-    #if defined(__ASSERT_FUNCTION)
-      #define _Assert( _e ) \
-	( ( _e ) ? \
-	  ( void ) 0 : \
-	    __assert_fail( #_e, __FILE__, __LINE__, __ASSERT_FUNCTION ) )
+
+  /**
+   * @brief Macro with method name used in assert output
+   *
+   * Given the variations in compilers and standards, we have to poke a bit.
+   *
+   * @note This is based on the code in newlib's assert.h.
+   */
+  #ifndef __RTEMS_ASSERT_FUNCTION
+    /* Use g++'s demangled names in C++.  */
+    #if defined __cplusplus && defined __GNUC__
+      #define __RTEMS_ASSERT_FUNCTION __PRETTY_FUNCTION__
+
+    /* C99 requires the use of __func__.  */
+    #elif __STDC_VERSION__ >= 199901L
+      #define __RTEMS_ASSERT_FUNCTION __func__
+
+    /* Older versions of gcc don't have __func__ but can use __FUNCTION__.  */
+    #elif __GNUC__ >= 2
+      #define __RTEMS_ASSERT_FUNCTION __FUNCTION__
+
+    /* failed to detect __func__ support.  */
     #else
-       #error "What does assert.h use?"
+      #define __RTEMS_ASSERT_FUNCTION ((char *) 0)
     #endif
+  #endif /* !__RTEMS_ASSERT_FUNCTION */
+
+  #if !defined( RTEMS_SCHEDSIM )
+    /* normal build is newlib. */
+
+    void __assert_func(const char *, int, const char *, const char *)
+      RTEMS_COMPILER_NO_RETURN_ATTRIBUTE;
+
+    #define _Assert( _e ) \
+       ( ( _e ) ? \
+         ( void ) 0 : \
+           __assert_func( __FILE__, __LINE__, __RTEMS_ASSERT_FUNCTION, #_e ) )
+
+  #elif defined(__linux__)
+    /* Scheduler simulator has only beed tested on glibc. */
+    #define _Assert( _e ) \
+     ( ( _e ) ? \
+       ( void ) 0 : \
+         __assert_fail( #_e, __FILE__, __LINE__, __RTEMS_ASSERT_FUNCTION ) )
+  #else
+    #error "Implement RTEMS assert support for this C Library"
   #endif
 
 #else