c-family: Honor -Wno-init-self for cv-qual vars [PR102633]

Since r11-5188-g32934a4f45a721, we drop qualifiers during l-to-r
conversion by creating a NOP_EXPR.  For e.g.

  const int i = i;

that means that the DECL_INITIAL is '(int) i' and not 'i' anymore.
Consequently, we don't suppress_warning here:

711     case DECL_EXPR:
715       if (VAR_P (DECL_EXPR_DECL (*expr_p))
716           && !DECL_EXTERNAL (DECL_EXPR_DECL (*expr_p))
717           && !TREE_STATIC (DECL_EXPR_DECL (*expr_p))
718           && (DECL_INITIAL (DECL_EXPR_DECL (*expr_p)) == DECL_EXPR_DECL (*expr_p))
719           && !warn_init_self)
720         suppress_warning (DECL_EXPR_DECL (*expr_p), OPT_Winit_self);

because of the check on line 718 -- (int) i is not i.  So -Wno-init-self
doesn't disable the warning as it's supposed to.

The following patch fixes it by moving the suppress_warning call from
c_gimplify_expr to the front ends, at points where we haven't created
the NOP_EXPR yet.

	PR middle-end/102633

gcc/c-family/ChangeLog:

	* c-gimplify.cc (c_gimplify_expr) <case DECL_EXPR>: Don't call
	suppress_warning here.

gcc/c/ChangeLog:

	* c-parser.cc (c_parser_initializer): Add new tree parameter.  Use it.
	Call suppress_warning.
	(c_parser_declaration_or_fndef): Pass d down to c_parser_initializer.
	(c_parser_omp_declare_reduction): Pass omp_priv down to
	c_parser_initializer.

gcc/cp/ChangeLog:

	* decl.cc (cp_finish_decl): Call suppress_warning.

gcc/testsuite/ChangeLog:

	* c-c++-common/Winit-self1.c: New test.
	* c-c++-common/Winit-self2.c: New test.

1 files changed, 15 insertions, 4 deletions

diff --git a/gcc/c/c-parser.cc b/gcc/c/c-parser.cc
index fa93959..759f200 100644
--- a/gcc/c/c-parser.cc
+++ b/gcc/c/c-parser.cc
@@ -1521,7 +1521,7 @@ static struct c_arg_info *c_parser_parms_list_declarator (c_parser *, tree,
 static struct c_parm *c_parser_parameter_declaration (c_parser *, tree, bool);
 static tree c_parser_simple_asm_expr (c_parser *);
 static tree c_parser_gnu_attributes (c_parser *);
-static struct c_expr c_parser_initializer (c_parser *);
+static struct c_expr c_parser_initializer (c_parser *, tree);
 static struct c_expr c_parser_braced_init (c_parser *, tree, bool,
 					   struct obstack *);
 static void c_parser_initelt (c_parser *, struct obstack *);
@@ -2286,7 +2286,7 @@ c_parser_declaration_or_fndef (c_parser *parser, bool fndef_ok,
 		  int flag_sanitize_save = flag_sanitize;
 		  if (TREE_CODE (d) == PARM_DECL)
 		    flag_sanitize = 0;
-		  init = c_parser_initializer (parser);
+		  init = c_parser_initializer (parser, d);
 		  flag_sanitize = flag_sanitize_save;
 		  finish_init ();
 		}
@@ -5211,11 +5211,13 @@ c_parser_type_name (c_parser *parser, bool alignas_ok)
    Any expression without commas is accepted in the syntax for the
    constant-expressions, with non-constant expressions rejected later.
 
+   DECL is the declaration we're parsing this initializer for.
+
    This function is only used for top-level initializers; for nested
    ones, see c_parser_initval.  */
 
 static struct c_expr
-c_parser_initializer (c_parser *parser)
+c_parser_initializer (c_parser *parser, tree decl)
 {
   if (c_parser_next_token_is (parser, CPP_OPEN_BRACE))
     return c_parser_braced_init (parser, NULL_TREE, false, NULL);
@@ -5224,6 +5226,15 @@ c_parser_initializer (c_parser *parser)
       struct c_expr ret;
       location_t loc = c_parser_peek_token (parser)->location;
       ret = c_parser_expr_no_commas (parser, NULL);
+      /* This is handled mostly by gimplify.cc, but we have to deal with
+	 not warning about int x = x; as it is a GCC extension to turn off
+	 this warning but only if warn_init_self is zero.  */
+      if (VAR_P (decl)
+	  && !DECL_EXTERNAL (decl)
+	  && !TREE_STATIC (decl)
+	  && ret.value == decl
+	  && !warn_init_self)
+	suppress_warning (decl, OPT_Winit_self);
       if (TREE_CODE (ret.value) != STRING_CST
 	  && TREE_CODE (ret.value) != COMPOUND_LITERAL_EXPR)
 	ret = convert_lvalue_to_rvalue (loc, ret, true, true);
@@ -22588,7 +22599,7 @@ c_parser_omp_declare_reduction (c_parser *parser, enum pragma_context context)
 		  location_t loc = c_parser_peek_token (parser)->location;
 		  rich_location richloc (line_table, loc);
 		  start_init (omp_priv, NULL_TREE, 0, &richloc);
-		  struct c_expr init = c_parser_initializer (parser);
+		  struct c_expr init = c_parser_initializer (parser, omp_priv);
 		  finish_init ();
 		  finish_decl (omp_priv, loc, init.value,
 		      	       init.original_type, NULL_TREE);