ada: Fix Ada.Text_IO.Delete with "encoding=8bits" form

Before this patch, on Windows, file with non-ASCII Latin1 names could be created
with Ada.Text_IO.Create by passing "encoding=8bits" through the Form
parameter and a Latin1-encoded string through the Name parameter,
but calling Ada.Text_IO.Delete on them raised an illegitimate exception.

This patch fixes this by making the wrappers of the unlink system function
aware of the encoding value passed through the Form parameter. It also
removes an unnecessary curly-brace block.

gcc/ada/

	* adaint.c (__gnat_unlink): Add new parameter and fix text
	conversion on Windows. Remove unnecessary curly braces.
	* adaint.h (__gnat_unlink): Add new parameter.
	* libgnat/i-cstrea.ads (unlink): Adapt to __gnat_unlink signature
	change.
	* libgnat/i-cstrea.adb (unlink): New Subprogram definition.
	* libgnat/s-crtl.ads (unlink): Adapt to __gnat_unlink signature
	change.
	* libgnat/s-fileio.adb (Delete): Pass encoding argument to unlink.

6 files changed, 24 insertions, 10 deletions

diff --git a/gcc/ada/adaint.c b/gcc/ada/adaint.c
index bb4ed26..4ab9565 100644
--- a/gcc/ada/adaint.c
+++ b/gcc/ada/adaint.c
@@ -747,15 +747,19 @@ __gnat_os_filename (char *filename ATTRIBUTE_UNUSED,
 /* Delete a file.  */
 
 int
-__gnat_unlink (char *path)
+__gnat_unlink (char *path, int encoding ATTRIBUTE_UNUSED)
 {
 #if defined (__MINGW32__) && ! defined (__vxworks) && ! defined (IS_CROSS)
-  {
-    TCHAR wpath[GNAT_MAX_PATH_LEN];
+  TCHAR wpath[GNAT_MAX_PATH_LEN];
 
+  if (encoding == Encoding_Unspecified)
     S2WSC (wpath, path, GNAT_MAX_PATH_LEN);
-    return _tunlink (wpath);
-  }
+  else if (encoding == Encoding_UTF8)
+    S2WSU (wpath, path, GNAT_MAX_PATH_LEN);
+  else
+    S2WS (wpath, path, GNAT_MAX_PATH_LEN);
+
+  return _tunlink (wpath);
 #else
   return unlink (path);
 #endif
diff --git a/gcc/ada/adaint.h b/gcc/ada/adaint.h
index 987432c..298ea9e 100644
--- a/gcc/ada/adaint.h
+++ b/gcc/ada/adaint.h
@@ -172,7 +172,7 @@ extern int    __gnat_open_new_temp		   (char *, int);
 extern int    __gnat_mkdir			   (char *, int);
 extern int    __gnat_stat			   (char *,
 						    GNAT_STRUCT_STAT *);
-extern int    __gnat_unlink                        (char *);
+extern int    __gnat_unlink                        (char *, int encoding);
 extern int    __gnat_rename                        (char *, char *);
 extern int    __gnat_chdir                         (char *);
 extern int    __gnat_rmdir                         (char *);
diff --git a/gcc/ada/libgnat/i-cstrea.adb b/gcc/ada/libgnat/i-cstrea.adb
index f761f3f..fe668e1 100644
--- a/gcc/ada/libgnat/i-cstrea.adb
+++ b/gcc/ada/libgnat/i-cstrea.adb
@@ -130,4 +130,13 @@ package body Interfaces.C_Streams is
       return C_setvbuf (stream, buffer, mode, size);
    end setvbuf;
 
+   ------------
+   -- unlink --
+   ------------
+
+   function unlink (filename : chars) return int is
+   begin
+      return System.CRTL.unlink (filename);
+   end unlink;
+
 end Interfaces.C_Streams;
diff --git a/gcc/ada/libgnat/i-cstrea.ads b/gcc/ada/libgnat/i-cstrea.ads
index 3911122..67f10cf 100644
--- a/gcc/ada/libgnat/i-cstrea.ads
+++ b/gcc/ada/libgnat/i-cstrea.ads
@@ -197,8 +197,7 @@ package Interfaces.C_Streams is
    function ungetc (c : int; stream : FILEs) return int
      renames System.CRTL.ungetc;
 
-   function unlink (filename : chars) return int
-     renames System.CRTL.unlink;
+   function unlink (filename : chars) return int;
 
    ---------------------
    -- Extra functions --
diff --git a/gcc/ada/libgnat/s-crtl.ads b/gcc/ada/libgnat/s-crtl.ads
index c3a3b64..56900a8 100644
--- a/gcc/ada/libgnat/s-crtl.ads
+++ b/gcc/ada/libgnat/s-crtl.ads
@@ -220,7 +220,8 @@ package System.CRTL is
    function ungetc (c : int; stream : FILEs) return int;
    pragma Import (C, ungetc, "ungetc");
 
-   function unlink (filename : chars) return int;
+   function unlink (filename : chars;
+     encoding : Filename_Encoding := Unspecified) return int;
    pragma Import (C, unlink, "__gnat_unlink");
 
    function open (filename : chars; oflag : int) return int;
diff --git a/gcc/ada/libgnat/s-fileio.adb b/gcc/ada/libgnat/s-fileio.adb
index 931b68a..f55cdc7 100644
--- a/gcc/ada/libgnat/s-fileio.adb
+++ b/gcc/ada/libgnat/s-fileio.adb
@@ -350,6 +350,7 @@ package body System.File_IO is
       declare
          Filename : aliased constant String := File.Name.all;
          Is_Temporary_File : constant Boolean := File.Is_Temporary_File;
+         Encoding : constant CRTL.Filename_Encoding := File.Encoding;
 
       begin
          Close (File_Ptr);
@@ -360,7 +361,7 @@ package body System.File_IO is
          --  it's a temporary file, then closing it already unlinked it.
 
          if not Is_Temporary_File then
-            if unlink (Filename'Address) = -1 then
+            if System.CRTL.unlink (Filename'Address, Encoding) = -1 then
                raise Use_Error with OS_Lib.Errno_Message;
             end if;
          end if;