[Ada] Fix internal consistency error with Duration and 32-bit target file

[Ada] Fix internal consistency error with Duration and 32-bit target file

[Pierre-Marie de Rodat]

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The Duration type of package Standard can be either a 32-bit or a 64-bit
fixed-point type depending on a flag in the system.ads file, but it needs
to be 32-bit when a target configuration file sets a 32-bit size for all
the predefined integer types.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* gnat1drv.adb (Adjust_Global_Switches): Force a 32-bit Duration
	type if the maximum integer size is lower than 64 bits.

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diff --git a/gcc/ada/gnat1drv.adb b/gcc/ada/gnat1drv.adb
--- a/gcc/ada/gnat1drv.adb
+++ b/gcc/ada/gnat1drv.adb
@@ -819,6 +819,12 @@ procedure Gnat1drv is
            Ttypes.Standard_Long_Long_Integer_Size;
       end if;
 
+      --  Forcefully use a 32-bit Duration with only 32-bit integer types
+
+      if Ttypes.System_Max_Integer_Size < 64 then
+         Targparm.Duration_32_Bits_On_Target := True;
+      end if;
+
       --  Finally capture adjusted value of Suppress_Options as the initial
       --  value for Scope_Suppress, which will be modified as we move from
       --  scope to scope (by Suppress/Unsuppress/Overflow_Checks pragmas).