[multiple changes]

2010-09-10  Robert Dewar  <dewar@adacore.com>

	* gnat_ugn.texi: Add section on intent of style checking options.

2010-09-10  Arnaud Charlet  <charlet@adacore.com>

	* xref_lib.adb (Get_Full_Type): Fix handling of 'a' char.

2010-09-10  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch3.adb: Improve error message on derivation from class-wide type

2010-09-10  Steve Baird  <baird@adacore.com>

	* gnat1drv.adb (Adjust_Global_Switches): Enable Expression_With_Actions
	generation when Generate_SCIL is True.

2010-09-10  Geert Bosch  <bosch@adacore.com>

	* gnatlink.adb (Check_ Existing_Executable): New procedure for checking
	validity of executable name and removing any existing executable
	(Gnatlink): Call Check_Existing_Executable.

From-SVN: r164154

gcc/ada/ChangeLog

+2010-09-10  Robert Dewar  <dewar@adacore.com>
+
+	* gnat_ugn.texi: Add section on intent of style checking options.
+
+2010-09-10  Arnaud Charlet  <charlet@adacore.com>
+
+	* xref_lib.adb (Get_Full_Type): Fix handling of 'a' char.
+
+2010-09-10  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch3.adb: Improve error message on derivation from class-wide type
+
+2010-09-10  Steve Baird  <baird@adacore.com>
+
+	* gnat1drv.adb (Adjust_Global_Switches): Enable Expression_With_Actions
+	generation when Generate_SCIL is True.
+
+2010-09-10  Geert Bosch  <bosch@adacore.com>
+
+	* gnatlink.adb (Check_ Existing_Executable): New procedure for checking
+	validity of executable name and removing any existing executable
+	(Gnatlink): Call Check_Existing_Executable.
+
 2010-09-10  Arnaud Charlet  <charlet@adacore.com>
 
 	* s-tporft.adb, s-taskin.ads (Register_Foreign_Thread): Move

gcc/ada/gnat1drv.adb

@@ -355,11 +355,6 @@ procedure Gnat1drv is
       elsif Debug_Flag_Dot_YY then
          Use_Expression_With_Actions := False;
 
-      --  If no debug flags, usage off for SCIL
-
-      elsif Generate_SCIL then
-         Use_Expression_With_Actions := False;
-
       --  Otherwise this feature is implemented, so we allow its use
 
       else

gcc/ada/gnat_ugn.texi

@@ -6144,6 +6144,17 @@ specified style check, an appropriate message is given, preceded by
 the character sequence ``(style)''. This message does not prevent
 successful compilation (unless the @option{-gnatwe} switch is used).
 
+Note that this is by no means intended to be a general facility for
+checking arbitrary coding standards. It is simply an embedding of the
+style rules we have chosen for the GNAT sources. If you are starting
+a project which does not have established style standards, you may
+find it useful to adopt the entire set of GNAT coding standards, or
+some subset of them. If you already have an established set of coding
+standards, then it may be that selected style checking options do
+indeed correspond to choices you have made, but for general checking
+of an existing set of coding rules, you should look to the gnatcheck
+tool, which is designed for that purpose.
+
 @ifset vms
 @code{(option,option,@dots{})} is a sequence of keywords
 @end ifset

gcc/ada/gnatlink.adb

@@ -199,6 +199,13 @@ procedure Gnatlink is
    function Base_Name (File_Name : String) return String;
    --  Return just the file name part without the extension (if present)
 
+   procedure Check_Existing_Executable (File_Name : String);
+   --  Delete any existing executable to avoid accidentally updating
+   --  the target of a symbolic link, but produce a Fatail_Error if
+   --  File_Name matches any of the source file names. This avoids
+   --  overwriting of extensionless source files by accident on systems
+   --  where executables do not have extensions.
+
    procedure Delete (Name : String);
    --  Wrapper to unlink as status is ignored by this application
 
@@ -258,6 +265,31 @@ procedure Gnatlink is
       return File_Name (Findex1 .. Findex2 - 1);
    end Base_Name;
 
+   -------------------------------
+   -- Check_Existing_Executable --
+   -------------------------------
+
+   procedure Check_Existing_Executable (File_Name : String) is
+      Ename : String := File_Name;
+      Efile : File_Name_Type;
+      Sfile : File_Name_Type;
+   begin
+      Canonical_Case_File_Name (Ename);
+      Name_Len := 0;
+      Add_Str_To_Name_Buffer (Ename);
+      Efile := Name_Find;
+
+      for J in Units.Table'First .. Units.Last loop
+         Sfile := Units.Table (J).Sfile;
+         if Sfile = Efile then
+            Exit_With_Error ("executable name """ & File_Name & """ matches "
+              & "source file name """ & Get_Name_String (Sfile) & """");
+         end if;
+      end loop;
+
+      Delete (File_Name);
+   end Check_Existing_Executable;
+
    ------------
    -- Delete --
    ------------
@@ -1759,16 +1791,7 @@ begin
         new String'(Output_File_Name.all);
    end if;
 
-   --  Delete existing executable, in case it is a symbolic link, to avoid
-   --  modifying the target of the symbolic link.
-
-   declare
-      Dummy : Boolean;
-      pragma Unreferenced (Dummy);
-
-   begin
-      Delete_File (Output_File_Name.all, Dummy);
-   end;
+   Check_Existing_Executable (Output_File_Name.all);
 
    --  Warn if main program is called "test", as that may be a built-in command
    --  on Unix. On non-Unix systems executables have a suffix, so the warning

gcc/ada/sem_ch3.adb

@@ -13520,10 +13520,20 @@ package body Sem_Ch3 is
          if not Is_Generic_Actual_Type (Parent_Type)
            or else In_Visible_Part (Scope (Parent_Type))
          then
+            if Is_Class_Wide_Type (Parent_Type) then
+               Error_Msg_N
+                 ("parent type must not be a class-wide type", Indic);
+
+               --  Use specific type to prevent cascaded errors.
+
+               Parent_Type := Etype (Parent_Type);
+
+            else
                Error_Msg_N
                  ("type derived from tagged type must have extension", Indic);
             end if;
          end if;
+      end if;
 
       --  AI-443: Synchronized formal derived types require a private
       --  extension. There is no point in checking the ancestor type or

gcc/ada/xref_lib.adb

@@ -518,7 +518,7 @@ package body Xref_Lib is
          when 'T' => return "task type";
          when 'W' => return "protected type";
 
-         when 'a' => return "array type";
+         when 'a' => return Param_String & "array object";
          when 'b' => return Param_String & "boolean object";
          when 'c' => return Param_String & "class-wide object";
          when 'd' => return Param_String & "decimal object";