c-decl.c (grokdeclarator): Make error for duplicate type qualifiers into a…

c-decl.c (grokdeclarator): Make error for duplicate type qualifiers into a pedwarn, disabled for C99.

	* c-decl.c (grokdeclarator): Make error for duplicate type
	qualifiers into a pedwarn, disabled for C99.

testsuite:
	* gcc.dg/c90-idem-qual-2.c, gcc.dg/c99-idem-qual-2.c: New tests.

From-SVN: r58983

gcc/ChangeLog

+2002-11-10  Joseph S. Myers  <jsm@polyomino.org.uk>
+
+	* c-decl.c (grokdeclarator): Make error for duplicate type
+	qualifiers into a pedwarn, disabled for C99.
+
 2002-11-10  Hans-Peter Nilsson  <hp@bitrange.com>
 
 	* config/mmix/mmix.h (FUNCTION_ARG_CALLEE_COPIES): Define the same

gcc/c-decl.c

@@ -3541,7 +3541,15 @@ grokdeclarator (declarator, declspecs, decl_context, initialized)
 		    }
 		}
 	      else if (specbits & (1 << (int) i))
-		error ("duplicate `%s'", IDENTIFIER_POINTER (id));
+		{
+		  if (i == RID_CONST || i == RID_VOLATILE || i == RID_RESTRICT)
+		    {
+		      if (!flag_isoc99)
+			pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
+		    }
+		  else
+		    error ("duplicate `%s'", IDENTIFIER_POINTER (id));
+		}
 
 	      /* Diagnose "__thread extern".  Recall that this list
 		 is in the reverse order seen in the text.  */

gcc/testsuite/ChangeLog

+2002-11-10  Joseph S. Myers  <jsm@polyomino.org.uk>
+
+	* gcc.dg/c90-idem-qual-2.c, gcc.dg/c99-idem-qual-2.c: New tests.
+
 2002-11-09  Hans-Peter Nilsson  <hp@bitrange.com>
 
 	* lib/compat.exp (compat-execute): Fix logic error in last

gcc/testsuite/gcc.dg/c90-idem-qual-2.c

+/* Test for idempotent type qualifiers: in C99 only.  Test "const const".  */
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1990 -pedantic-errors" } */
+
+const const int foo; /* { dg-bogus "warning" "warning in place of error" } */
+/* { dg-error "duplicate" "duplicate type qualifier error" { target *-*-* } 6 } */

gcc/testsuite/gcc.dg/c99-idem-qual-2.c

+/* Test for idempotent type qualifiers: in C99 only.  Test "const const".  */
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+
+const const int foo; /* { dg-bogus "duplicate" "duplicate type qualifier error" } */