PR c/66970 - Add __has_builtin() macro

gcc/ChangeLog:

	PR c/66970
	* doc/cpp.texi (__has_builtin): Document.
	* doc/extend.texi (__builtin_frob_return_addr): Correct spelling.

gcc/c/ChangeLog:

	PR c/66970
	* c-decl.c (names_builtin_p): Define a new function.

gcc/c-family/ChangeLog:

	PR c/66970
	* c-common.c (c_common_nodes_and_builtins): Call c_define_builtins
	even when only preprocessing.
	* c-common.h (names_builtin_p): Declare new function.
	* c-lex.c (init_c_lex): Set has_builtin.
	(c_common_has_builtin): Define a new function.
	* c-ppoutput.c (init_pp_output): Set has_builtin.

gcc/cp/ChangeLog:

	PR c/66970
	* cp-objcp-common.c (names_builtin_p): Define new function.

gcc/testsuite/ChangeLog:

	PR c/66970
	* c-c++-common/cpp/has-builtin-2.c: New test.
	* c-c++-common/cpp/has-builtin-3.c: New test.
	* c-c++-common/cpp/has-builtin.c: New test.

From-SVN: r277544

1 files changed, 72 insertions, 0 deletions

diff --git a/gcc/cp/cp-objcp-common.c b/gcc/cp/cp-objcp-common.c
index f38b4e8..60dcbe4 100644
--- a/gcc/cp/cp-objcp-common.c
+++ b/gcc/cp/cp-objcp-common.c
@@ -24,6 +24,7 @@ along with GCC; see the file COPYING3.  If not see
 #include "cp-tree.h"
 #include "cp-objcp-common.h"
 #include "dwarf2.h"
+#include "stringpool.h"
 
 /* Special routine to get the alias set for C++.  */
 
@@ -348,6 +349,77 @@ identifier_global_value (tree name)
   return get_global_binding (name);
 }
 
+/* Returns true if NAME refers to a built-in function or function-like
+   operator.  */
+
+bool
+names_builtin_p (const char *name)
+{
+  tree id = get_identifier (name);
+  if (tree binding = get_global_binding (id))
+    {
+      if (TREE_CODE (binding) == FUNCTION_DECL && DECL_IS_BUILTIN (binding))
+	return true;
+
+      /* Handle the case when an overload for a  built-in name exists.  */
+      if (TREE_CODE (binding) != OVERLOAD)
+	return false;
+
+      for (ovl_iterator it (binding); it; ++it)
+	{
+	  tree decl = *it;
+	  if (DECL_IS_BUILTIN (decl))
+	    return true;
+	}
+    }
+
+  /* Also detect common reserved C++ words that aren't strictly built-in
+     functions.  */
+  switch (C_RID_CODE (id))
+    {
+    case RID_ADDRESSOF:
+    case RID_BUILTIN_CONVERTVECTOR:
+    case RID_BUILTIN_HAS_ATTRIBUTE:
+    case RID_BUILTIN_SHUFFLE:
+    case RID_BUILTIN_LAUNDER:
+    case RID_OFFSETOF:
+    case RID_HAS_NOTHROW_ASSIGN:
+    case RID_HAS_NOTHROW_CONSTRUCTOR:
+    case RID_HAS_NOTHROW_COPY:
+    case RID_HAS_TRIVIAL_ASSIGN:
+    case RID_HAS_TRIVIAL_CONSTRUCTOR:
+    case RID_HAS_TRIVIAL_COPY:
+    case RID_HAS_TRIVIAL_DESTRUCTOR:
+    case RID_HAS_UNIQUE_OBJ_REPRESENTATIONS:
+    case RID_HAS_VIRTUAL_DESTRUCTOR:
+    case RID_IS_ABSTRACT:
+    case RID_IS_AGGREGATE:
+    case RID_IS_BASE_OF:
+    case RID_IS_CLASS:
+    case RID_IS_EMPTY:
+    case RID_IS_ENUM:
+    case RID_IS_FINAL:
+    case RID_IS_LITERAL_TYPE:
+    case RID_IS_POD:
+    case RID_IS_POLYMORPHIC:
+    case RID_IS_SAME_AS:
+    case RID_IS_STD_LAYOUT:
+    case RID_IS_TRIVIAL:
+    case RID_IS_TRIVIALLY_ASSIGNABLE:
+    case RID_IS_TRIVIALLY_CONSTRUCTIBLE:
+    case RID_IS_TRIVIALLY_COPYABLE:
+    case RID_IS_UNION:
+    case RID_IS_ASSIGNABLE:
+    case RID_IS_CONSTRUCTIBLE:
+    case RID_UNDERLYING_TYPE:
+      return true;
+    default:
+      break;
+    }
+
+  return false;
+}
+
 /* Register c++-specific dumps.  */
 
 void