build: Add cxx14_constexpr requirement to example/Jamfile

example/Jamfile

@@ -1,20 +1,37 @@
 # Boost.GIL (Generic Image Library) - examples
 #
-# Copyright (c) 2018 Mateusz Loskot <[email protected]>
+# Copyright (c) 2018-2022 Mateusz Loskot <[email protected]>
 #
 # Use, modification and distribution is subject to 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)
 
+import ../../config/checks/config : requires ;
 import regex ;
 
 using libjpeg : : : : true ; # work around bug on master
 using libpng : : : : true ;
 
-project
-    : # requirements
-    ;
+# The <experimental/filesystem> header providing std::experimental::filesystem
+# is deprecated by Microsoft and will be REMOVED. It is superseded by the C++17
+# <filesystem> header providing std::filesystem.
+# You can define _SILENCE_EXPERIMENTAL_FILESYSTEM_DEPRECATION_WARNING
+# to acknowledge that you have received this warning.
+local msvc-cxxs-with-experimental-fs = 14 ;
 
+project
+  :
+  requirements
+    [ requires
+        cxx14_constexpr
+        cxx14_return_type_deduction
+    ]
+    <include>.
+    # TODO: Enable concepts check for all, not just test/core
+    #<define>BOOST_GIL_USE_CONCEPT_CHECK=1
+    <toolset>msvc,<cxxstd>$(msvc-cxxs-with-experimental-fs):<define>_SILENCE_EXPERIMENTAL_FILESYSTEM_DEPRECATION_WARNING=1
+    <toolset>msvc:<cxxflags>/bigobj
+  ;
 
 local sources =
     adaptive_histogram_equalization.cpp