decl.c (grokfndecl): Add const cp_decl_specifier_seq* parameter...

/cp
2018-06-20  Paolo Carlini  <paolo.carlini@oracle.com>

	* decl.c (grokfndecl): Add const cp_decl_specifier_seq* parameter;
	tidy handling of a null location_t argument; use proper location
	information in a few additional error messages.
	(grokdeclarator): Update calls.

/testsuite
2018-06-20  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/template/friend65.C: New.
	* g++.dg/cpp0x/main1.C: Likewise.
	* g++.dg/other/main2.C: Likewise.
	* g++.dg/other/main3.C: Likewise.
	* g++.dg/template/friend42.C: Test location too.
	* g++.dg/concepts/decl-diagnose.C: Likewise.
	* g++.dg/warn/main-2.C: Update.

From-SVN: r261816

gcc/cp/ChangeLog

+2018-06-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* decl.c (grokfndecl): Add const cp_decl_specifier_seq* parameter;
+	tidy handling of a null location_t argument; use proper location
+	information in a few additional error messages.
+	(grokdeclarator): Update calls.
+
 2018-06-20  Chung-Lin Tang <cltang@codesourcery.com>
 	    Thomas Schwinge <thomas@codesourcery.com>
 	    Cesar Philippidis  <cesar@codesourcery.com>

gcc/cp/decl.c

@@ -8588,6 +8588,7 @@ grokfndecl (tree ctype,
 	    tree declarator,
 	    tree parms,
 	    tree orig_declarator,
+	    const cp_decl_specifier_seq *declspecs,
 	    tree decl_reqs,
 	    int virtualp,
 	    enum overload_flags flags,
@@ -8611,19 +8612,22 @@ grokfndecl (tree ctype,
   int staticp = ctype && TREE_CODE (type) == FUNCTION_TYPE;
   tree t;
 
+  if (location == UNKNOWN_LOCATION)
+    location = input_location;
+
   // Was the concept specifier present?
   bool concept_p = inlinep & 4;
 
   // Concept declarations must have a corresponding definition.
   if (concept_p && !funcdef_flag)
     {
-      error ("concept %qD has no definition", declarator);
+      error_at (location, "concept %qD has no definition", declarator);
       return NULL_TREE;
     }
 
   type = build_cp_fntype_variant (type, rqual, raises, late_return_type_p);
 
-  decl = build_lang_decl (FUNCTION_DECL, declarator, type);
+  decl = build_lang_decl_loc (location, FUNCTION_DECL, declarator, type);
 
   /* Set the constraints on the declaration. */
   if (flag_concepts)
@@ -8640,11 +8644,6 @@ grokfndecl (tree ctype,
       set_constraints (decl, ci);
     }
 
-  /* If we have an explicit location, use it, otherwise use whatever
-     build_lang_decl used (probably input_location).  */
-  if (location != UNKNOWN_LOCATION)
-    DECL_SOURCE_LOCATION (decl) = location;
-
   if (TREE_CODE (type) == METHOD_TYPE)
     {
       tree parm = build_this_parm (decl, type, quals);
@@ -8713,17 +8712,19 @@ grokfndecl (tree ctype,
 	    if (TREE_PURPOSE (t)
 		&& TREE_CODE (TREE_PURPOSE (t)) == DEFAULT_ARG)
 	    {
-	      error ("default arguments are not allowed in declaration "
-		     "of friend template specialization %qD",
-		     decl);
+	      error_at (defarg_location (TREE_PURPOSE (t)),
+			"default arguments are not allowed in declaration "
+			"of friend template specialization %qD",
+			decl);
 	      return NULL_TREE;
 	    }
 
 	  if (inlinep & 1)
 	    {
-	      error ("%<inline%> is not allowed in declaration of friend "
-		     "template specialization %qD",
-		     decl);
+	      error_at (declspecs->locations[ds_inline],
+			"%<inline%> is not allowed in declaration of friend "
+			"template specialization %qD",
+			decl);
 	      return NULL_TREE;
 	    }
 	}
@@ -8770,13 +8771,15 @@ grokfndecl (tree ctype,
   if (ctype == NULL_TREE && DECL_MAIN_P (decl))
     {
       if (PROCESSING_REAL_TEMPLATE_DECL_P())
-	error ("cannot declare %<::main%> to be a template");
+	error_at (location, "cannot declare %<::main%> to be a template");
       if (inlinep & 1)
-	error ("cannot declare %<::main%> to be inline");
+	error_at (declspecs->locations[ds_inline],
+		  "cannot declare %<::main%> to be inline");
       if (inlinep & 2)
-	error ("cannot declare %<::main%> to be %<constexpr%>");
+	error_at (declspecs->locations[ds_constexpr],
+		  "cannot declare %<::main%> to be %<constexpr%>");
       if (!publicp)
-	error ("cannot declare %<::main%> to be static");
+	error_at (location, "cannot declare %<::main%> to be static");
       inlinep = 0;
       publicp = 1;
     }
@@ -8989,7 +8992,8 @@ grokfndecl (tree ctype,
 	{
 	  tree oldtypeargs = TYPE_ARG_TYPES (TREE_TYPE (decl));
 	  tree newtype;
-	  error ("%<::main%> must return %<int%>");
+	  error_at (declspecs->locations[ds_type_spec],
+		    "%<::main%> must return %<int%>");
 	  newtype = build_function_type (integer_type_node, oldtypeargs);
 	  TREE_TYPE (decl) = newtype;
 	}
@@ -12145,6 +12149,7 @@ grokdeclarator (const cp_declarator *declarator,
 			       ? unqualified_id : dname,
 			       parms,
 			       unqualified_id,
+			       declspecs,
 			       reqs,
 			       virtualp, flags, memfn_quals, rqual, raises,
 			       friendp ? -1 : 0, friendp, publicp,
@@ -12389,6 +12394,7 @@ grokdeclarator (const cp_declarator *declarator,
 		   || storage_class != sc_static);
 
 	decl = grokfndecl (ctype, type, original_name, parms, unqualified_id,
+			   declspecs,
                            reqs, virtualp, flags, memfn_quals, rqual, raises,
 			   1, friendp,
 			   publicp,

gcc/testsuite/ChangeLog

+2018-06-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* g++.dg/template/friend65.C: New.
+	* g++.dg/cpp0x/main1.C: Likewise.
+	* g++.dg/other/main2.C: Likewise.
+	* g++.dg/other/main3.C: Likewise.
+	* g++.dg/template/friend42.C: Test location too.
+	* g++.dg/concepts/decl-diagnose.C: Likewise.
+	* g++.dg/warn/main-2.C: Update.
+
 2018-06-20  Chung-Lin Tang <cltang@codesourcery.com>
 	    Thomas Schwinge <thomas@codesourcery.com>
 	    Cesar Philippidis  <cesar@codesourcery.com>

gcc/testsuite/g++.dg/concepts/decl-diagnose.C

@@ -6,7 +6,7 @@ void f(concept int); // { dg-error "a parameter cannot be declared 'concept'" }
 
 template<typename T>
 concept int f2() { return 0; } // { dg-error "return type" }
-concept bool f3(); // { dg-error "no definition" }
+concept bool f3(); // { dg-error "14:concept .f3. has no definition" }
 
 struct X
 {

gcc/testsuite/g++.dg/cpp0x/main1.C

+// { dg-do compile { target c++11 } }
+
+constexpr int main();  // { dg-error "1:cannot declare .::main. to be .constexpr." }

gcc/testsuite/g++.dg/other/main2.C

+float main();  // { dg-error "1:.::main. must return .int." }

gcc/testsuite/g++.dg/other/main3.C

+inline int main();  // { dg-error "1:cannot declare .::main. to be inline" }

gcc/testsuite/g++.dg/template/friend42.C

@@ -4,5 +4,5 @@ template <class T> void foo (int);
 
 template <class T>
 class Q {
-  friend void foo<T> (int = 3); // { dg-error "default argument" }
+  friend void foo<T> (int = 3); // { dg-error "27:default arguments are not allowed in declaration of friend" }
 };

gcc/testsuite/g++.dg/template/friend65.C

+template <class T> void foo (int);
+
+template <class T>
+class Q {
+  friend inline void foo<T> (int); // { dg-error "10:.inline. is not allowed in declaration of friend" }
+};

gcc/testsuite/g++.dg/warn/main-2.C

@@ -7,8 +7,8 @@
 
 void f1();  
   
-void
-main()  /* { dg-error "must return" } */
+void  /* { dg-error "1:.\:\:main. must return .int." } */
+main()
 {     
   f1();  
 }