[testsuite] Minor cleanup in gnat.dg/stack_usage* tests

[Eric Botcazou]

This replaces the scanning of the -fstack-usage output with -Wstack-usage.

Tested on x86-64/Linux, applied on the mainline and 8 branch.


2018-05-31  Eric Botcazou  <ebotca...@adacore.com>

        * gnat.dg/stack_usage1.adb: Replace -fstack-usage with -Wstack-usage.
        * gnat.dg/stack_usage1b.adb: Likewise.
        * gnat.dg/stack_usage1c.adb: Likewise.
        * gnat.dg/stack_usage3.adb: Likewise.
        * gnat.dg/stack_usage1_pkg.adb: Delete.

-- 
Eric Botcazou
Index: gnat.dg/stack_usage1.adb
===================================================================
--- gnat.dg/stack_usage1.adb	(revision 260913)
+++ gnat.dg/stack_usage1.adb	(working copy)
@@ -1,5 +1,5 @@
 -- { dg-do compile }
--- { dg-options "-fstack-usage" }
+-- { dg-options "-Wstack-usage=128" { target i?86-*-* x86_64-*-* } }
 
 with Stack_Usage1_Pkg; use Stack_Usage1_Pkg;
 
@@ -34,6 +34,3 @@ begin
    end case;
 
 end Stack_Usage1;
-
--- { dg-final { scan-stack-usage "\t\[0-9\]\[0-9\]\t" { target i?86-*-* x86_64-*-* } } }
--- { dg-final { cleanup-stack-usage } }
Index: gnat.dg/stack_usage1_pkg.adb
===================================================================
--- gnat.dg/stack_usage1_pkg.adb	(revision 260913)
+++ gnat.dg/stack_usage1_pkg.adb	(nonexistent)
@@ -1,13 +0,0 @@
-package body Stack_Usage1_Pkg is
-
-   function Ident_Int (X : Integer) return Integer is
-   begin
-      return X;
-   end Ident_Int;
-
-   procedure My_Proc (X : R) is
-   begin
-      null;
-   end My_Proc;
-
-end Stack_Usage1_Pkg;
Index: gnat.dg/stack_usage1b.adb
===================================================================
--- gnat.dg/stack_usage1b.adb	(revision 260913)
+++ gnat.dg/stack_usage1b.adb	(working copy)
@@ -1,5 +1,5 @@
 -- { dg-do compile }
--- { dg-options "-O -fstack-usage" }
+-- { dg-options "-O -Wstack-usage=128" { target i?86-*-* x86_64-*-* } }
 
 with Stack_Usage1_Pkg; use Stack_Usage1_Pkg;
 
@@ -34,6 +34,3 @@ begin
    end case;
 
 end Stack_Usage1b;
-
--- { dg-final { scan-stack-usage "\t\[0-9\]\[0-9\]\t" { target i?86-*-* x86_64-*-* } } }
--- { dg-final { cleanup-stack-usage } }
Index: gnat.dg/stack_usage1c.adb
===================================================================
--- gnat.dg/stack_usage1c.adb	(revision 260913)
+++ gnat.dg/stack_usage1c.adb	(working copy)
@@ -1,5 +1,5 @@
 -- { dg-do compile }
--- { dg-options "-O2 -fstack-usage" }
+-- { dg-options "-O2 -Wstack-usage=128" { target i?86-*-* x86_64-*-* } }
 
 with Stack_Usage1_Pkg; use Stack_Usage1_Pkg;
 
@@ -34,6 +34,3 @@ begin
    end case;
 
 end Stack_Usage1c;
-
--- { dg-final { scan-stack-usage "\t\[0-9\]\[0-9\]\t" { target i?86-*-* x86_64-*-* } } }
--- { dg-final { cleanup-stack-usage } }
Index: gnat.dg/stack_usage3.adb
===================================================================
--- gnat.dg/stack_usage3.adb	(revision 260913)
+++ gnat.dg/stack_usage3.adb	(working copy)
@@ -1,5 +1,5 @@
 -- { dg-do compile }
--- { dg-options "-O -fstack-usage" }
+-- { dg-options "-O -Wstack-usage=1024" }
 
 with Ada.Text_IO; use Ada.Text_IO;
 with Stack_Usage3_Pkg; use Stack_Usage3_Pkg;
@@ -27,6 +27,3 @@ begin
    Put_Line (Diag ("Diag line 19"));
    Put_Line (Diag ("Diag line 20"));
 end;
-
--- { dg-final { scan-stack-usage-not "\t\[0-9\]\[0-9\]\[0-9\]\[0-9\]\t" } }
--- { dg-final { cleanup-stack-usage } }