output.adb (Flush_Buffer): Do not indent blank lines.

2009-04-20  Bob Duff  <duff@adacore.com>

	* output.adb (Flush_Buffer): Do not indent blank lines.
	(Ignore_Output): New procedure for output suppression.

From-SVN: r146402

gcc/ada/output.adb

@@ -112,14 +112,17 @@ package body Output is
 
       Len : constant Natural := Next_Col - 1;
 
+   --  Start of processing for Flush_Buffer
+
    begin
       if Len /= 0 then
          begin
             --  If there's no indentation, or if the line is too long with
-            --  indentation, just write the buffer.
+            --  indentation, or if it's a blank line, just write the buffer.
 
             if Cur_Indentation = 0
               or else Cur_Indentation + Len > Buffer_Max
+              or else Buffer (1 .. Len) = (1 => ASCII.LF)
             then
                Write_Buffer (Buffer (1 .. Len));
 
@@ -156,6 +159,15 @@ package body Output is
       end if;
    end Flush_Buffer;
 
+   -------------------
+   -- Ignore_Output --
+   -------------------
+
+   procedure Ignore_Output (S : String) is
+   begin
+      null;
+   end Ignore_Output;
+
    ------------
    -- Indent --
    ------------

gcc/ada/output.ads

@@ -66,6 +66,10 @@ package Output is
    --  It is never an error to call Cancel_Special_Output. It has the same
    --  effect as calling Set_Special_Output (null).
 
+   procedure Ignore_Output (S : String);
+   --  Does nothing. To disable output, pass Ignore_Output'Access to
+   --  Set_Special_Output.
+
    procedure Set_Standard_Error;
    --  Sets subsequent output to appear on the standard error file (whatever
    --  that might mean for the host operating system, if anything) when