Add <warning>extra to all tests, -Wshadow to gcc

test/Jamfile.v2

@@ -1,14 +1,20 @@
 #  Boost.Assert Library test Jamfile
 #
-#  Copyright (c) 2014, 2017 Peter Dimov
+#  Copyright (c) 2014, 2017, 2019 Peter Dimov
 #
 #  Distributed under the Boost Software License, Version 1.0.
 #  See accompanying file LICENSE_1_0.txt or copy at
 #  http://www.boost.org/LICENSE_1_0.txt
 
-# bring in rules for testing
 import testing ;
 
+project : requirements
+  <warnings>extra
+  <toolset>msvc:<warnings-as-errors>on
+  <toolset>clang:<warnings-as-errors>on
+  <toolset>gcc:<warnings-as-errors>on
+  <toolset>gcc:<cxxflags>-Wshadow ;
+
 run assert_test.cpp ;
 run current_function_test.cpp
   : : : <test-info>always_show_run_output ;
@@ -29,6 +35,6 @@ run quick.cpp ;
 run current_function_test2.cpp ;
 
 run source_location_test.cpp
-  : : : <warnings>extra <warnings-as-errors>on ;
+  : : : <toolset>gcc-4.4.7:<warnings-as-errors>off ;
 run source_location_test2.cpp
-  : : : <warnings>extra <warnings-as-errors>on ;
+  : : : <toolset>gcc-4.4.7:<warnings-as-errors>off ;