re PR c++/18514 (Alternate "asm" name ignored for redeclared builtin function imported into namespace std)

PR c++/18514
 	* name-lookup.c (do_nonmember_using_decl): A real function
 	declaration takes precedence over an anticipated declaration.
 	* g++.dg/ext/builtin1.C: New
 	* g++.dg/ext/builtin2.C: New
 	* g++.dg/ext/builtin3.C: New
 	* g++.dg/ext/builtin4.C: New
 	* g++.dg/ext/builtin5.C: New

From-SVN: r91972

gcc/cp/ChangeLog

@@ -1,3 +1,9 @@
+2004-12-09  Matt Austern  <austern@apple.com>
+
+	PR c++/18514
+	* name-lookup.c (do_nonmember_using_decl): A real function
+	declaration takes precedence over an anticipated declaration.
+	
 2004-12-09  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
 
 	* parser.c (cp_parser_member_declaration): Fix comment typo.

gcc/cp/name-lookup.c

@@ -2064,10 +2064,16 @@ do_nonmember_using_decl (tree scope, tree name, tree oldval, tree oldtype,
 	             are the same extern "C" functions, that's ok.  */
                   if (decls_match (new_fn, old_fn))
 		    {
-		      /* If the OLD_FN was a builtin, there is now a
-			 real declaration.  */
+		      /* If the OLD_FN was a builtin, we've seen a real 
+			 declaration in another namespace.  Use it instead.
+			 Set tmp1 to NULL so we can use the existing
+			 OVERLOAD logic at the end of this inner loop.
+		      */
 		      if (DECL_ANTICIPATED (old_fn))
-			DECL_ANTICIPATED (old_fn) = 0;
+			{
+			  gcc_assert (! DECL_ANTICIPATED (new_fn));
+			  tmp1 = NULL;
+			}
 		      break;
 		    }
 		  else if (!DECL_ANTICIPATED (old_fn))

gcc/testsuite/ChangeLog

@@ -1,3 +1,12 @@
+2004-12-09  Matt Austern  <austern@apple.com>
+
+	PR c++/18514
+	* g++.dg/ext/builtin1.C: New
+	* g++.dg/ext/builtin2.C: New
+	* g++.dg/ext/builtin3.C: New
+	* g++.dg/ext/builtin4.C: New
+	* g++.dg/ext/builtin5.C: New
+
 2004-12-09  Andrew Pinski  <pinskia@physics.uc.edu>
 
 	PR tree-opt/18904

gcc/testsuite/g++.dg/ext/builtin1.C

@@ -0,0 +1,10 @@
+// Test whether alternate 'asm' name is applied correctly to
+// builtin in global namespace
+
+// { dg-do compile }
+// { dg-options "" }
+// { dg-final { scan-assembler "fancy_printf" } }
+
+extern "C" int printf(char*, ...) __asm("_fancy_printf");
+
+void foo() { printf("abc"); }

gcc/testsuite/g++.dg/ext/builtin2.C

@@ -0,0 +1,13 @@
+// PR c++/18514
+// Test whether alternate 'asm' name is applied correctly to
+// builtin imported into namespace std.
+
+// { dg-do compile }
+// { dg-options "" }
+// { dg-final { scan-assembler "fancy_printf" } }
+
+extern "C" int printf(char*, ...) __asm("_fancy_printf");
+
+namespace std { using ::printf; }
+
+namespace std { void foo() { printf("abc"); } }

gcc/testsuite/g++.dg/ext/builtin3.C

@@ -0,0 +1,13 @@
+// Verify that declaring builtin in namespace std doesn't give us
+// declaration in global namespace
+
+// { dg-do compile }
+// { dg-options "" }
+
+namespace std {
+extern "C" int printf(char*, ...);
+}
+
+void foo() {
+  printf("abc"); 		// { dg-error "not declared" }
+}

gcc/testsuite/g++.dg/ext/builtin4.C

@@ -0,0 +1,10 @@
+// Verify that builtin is used when declared in global namespace
+
+// { dg-do compile }
+// { dg-options "-Wall" }
+
+extern "C" int printf(const char*,...);
+
+void foo() {
+  printf("%d"); 		// { dg-warning "too few arguments" }
+}

gcc/testsuite/g++.dg/ext/builtin5.C

@@ -0,0 +1,12 @@
+// Verify that builtin is used when declared in namespace std
+
+// { dg-do compile }
+// { dg-options "-Wall" }
+
+namespace std {
+  extern "C" int printf(const char*,...);
+}
+
+void foo() {
+  std::printf("%d"); 		// { dg-warning "too few arguments" }
+}