[Ada] Fix PR ada/78531

[Eric Botcazou <ebotcazou at adacore dot com>]

This is the bootstrap failure on the mainline with _FORTIFY_SOURCE enabled.

Fixed thusly, tested on x86_64-suse-linux, applied on the mainline.


2016-11-27  Eric Botcazou  <ebotcazou@adacore.com>

	PR ada/78531
	* namet.h (Max_Line_Length): Define.
	(struct Bounded_String): Declare Chars with exact size.
	(namet__get_decoded_name_string): Delete.
	(Get_Decoded_Name_String): Likewise.
	(casing__set_all_upper_case): Likewise.

-- 
Eric Botcazou

Index: namet.h
===================================================================
--- namet.h	(revision 242863)
+++ namet.h	(working copy)
@@ -6,7 +6,7 @@
  *                                                                          *
  *                              C Header File                               *
  *                                                                          *
- *            Copyright (C) 1992-2015, Free Software Foundation, Inc.       *
+ *            Copyright (C) 1992-2016, Free Software Foundation, Inc.       *
  *                                                                          *
  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  * terms of the  GNU General Public License as published  by the Free Soft- *
@@ -25,7 +25,7 @@
 
 /* This is the C file that corresponds to the Ada package specification
    Namet.  It was created manually from files namet.ads and namet.adb.
-   Some subprograms from Sinput are also made accessible here.  */
+   Subprograms from Exp_Dbug and Sinput are also made accessible here.  */
 
 #ifdef __cplusplus
 extern "C" {
@@ -52,14 +52,15 @@ extern struct Name_Entry *Names_Ptr;
 #define Name_Chars_Ptr namet__name_chars__table
 extern char *Name_Chars_Ptr;
 
-/* The global name buffer. */
+/* This is Hostparm.Max_Line_Length.  */
+#define Max_Line_Length (32767 - 1)
+
+/* The global name buffer.  */
 struct Bounded_String
 {
   Nat Max_Length;
   Nat Length;
-  char Chars[1];
-  /* The 1 here is wrong, but it doesn't matter, because all the code either
-     goes by Length, or NUL-terminates the string before processing it. */
+  char Chars[4 * Max_Line_Length]; /* Exact value for overflow detection.  */
 };
 
 #define Global_Name_Buffer namet__global_name_buffer
@@ -81,32 +82,9 @@ Get_Name_String (Name_Id Id)
   return Name_Chars_Ptr + Names_Ptr[Id - First_Name_Id].Name_Chars_Index + 1;
 }
 
-/* Get_Decoded_Name_String returns a null terminated C string in the same
-   manner as Get_Name_String, except that it is decoded (i.e. upper half or
-   wide characters are put back in their external form, and character literals
-   are also returned in their external form (with surrounding apostrophes) */
-
-extern void namet__get_decoded_name_string (Name_Id);
-
-static char *Get_Decoded_Name_String (Name_Id);
-
-INLINE char *
-Get_Decoded_Name_String (Name_Id Id)
-{
-  namet__get_decoded_name_string (Id);
-  Name_Buffer[Name_Len] = 0;
-  return Name_Buffer;
-}
-
 #define Name_Equals namet__name_equals
 extern Boolean Name_Equals (Name_Id, Name_Id);
 
-/* Like Get_Decoded_Name_String, but the result has all qualification and
-   package body entity suffixes stripped, and also all letters are upper
-   cased.  This is used for building the enumeration literal table. */
-
-extern void casing__set_all_upper_case (void);
-
 /* The following routines and variables are not part of Namet, but we
    include the header here since it seems the best place for it.  */