[Ada] Store -G xxx switches

2018-09-26  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* back_end.adb (Scan_Compiler_Arguments): Store -G xxx switches.

From-SVN: r264634

gcc/ada/ChangeLog

+2018-09-26  Arnaud Charlet  <charlet@adacore.com>
+
+	* back_end.adb (Scan_Compiler_Arguments): Store -G xxx switches.
+
 2018-09-26  Yannick Moy  <moy@adacore.com>
 
 	* errout.ads: Update comment for insertion character '?'.

gcc/ada/back_end.adb

@@ -210,6 +210,9 @@ package body Back_End is
       Next_Arg : Positive;
       --  Next argument to be scanned
 
+      Arg_Count : constant Natural := Natural (save_argc - 1);
+      Args      : Argument_List (1 .. Arg_Count);
+
       Output_File_Name_Seen : Boolean := False;
       --  Set to True after having scanned file_name for switch "-gnatO file"
 
@@ -234,14 +237,27 @@ package body Back_End is
          Last  : constant Natural  := Switch_Last (Switch_Chars);
 
       begin
-         --  Skip -o, -G or internal GCC switches together with their argument.
+         --  Skip -o or internal GCC switches together with their argument.
 
          if Switch_Chars (First .. Last) = "o"
-           or else Switch_Chars (First .. Last) = "G"
            or else Is_Internal_GCC_Switch (Switch_Chars)
          then
             Next_Arg := Next_Arg + 1;
 
+         --  Store -G xxx as -Gxxx and go directly to the next argument.
+
+         elsif Switch_Chars (First .. Last) = "G" then
+            Next_Arg := Next_Arg + 1;
+
+            --  Should never get there with -G not followed by an argument,
+            --  but use defensive code nonetheless.
+            --  Store as -Gxxx to avoid storing parameters in ALI files that
+            --  might create confusion.
+
+            if Next_Arg <= Args'Last then
+               Store_Compilation_Switch (Switch_Chars & Args (Next_Arg).all);
+            end if;
+
          --  Do not record -quiet switch
 
          elsif Switch_Chars (First .. Last) = "quiet" then
@@ -294,11 +310,6 @@ package body Back_End is
          end if;
       end Scan_Back_End_Switches;
 
-      --  Local variables
-
-      Arg_Count : constant Natural := Natural (save_argc - 1);
-      Args      : Argument_List (1 .. Arg_Count);
-
    --  Start of processing for Scan_Compiler_Arguments
 
    begin