Cleanups of cmake build use support.

test/test_cmake/CMakeLists.txt

@@ -1,21 +1,29 @@
-# Copyright 2018 Mike Dev
+# Copyright Mike Dev 2018
+# Copyright Rene Rivera 2018
 # 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
-#
-# NOTE: This does NOT run the unit tests for Boost.Predef.
-#       It only tests, if the CMakeLists.txt file in predef's
-#       root directory works as expected (i.e. it provides the
-#       target Boost::predef which in turn provides the
-#       correct include directory )
+# See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt
 
-cmake_minimum_required( VERSION 3.5 )
+# NOTE:
+#   This does NOT run the unit tests for Boost.Predef.
+#   It only tests, if the CMakeLists.txt file in predef's
+#   root directory works as expected (i.e. it provides the
+#   target Boost::predef which in turn provides the
+#   correct include directory )
+
+# We have very simple cmake requirements we we still require the new style
+# declarative targets.
+cmake_minimum_required( VERSION 3.0 )
 
 project( BoostPredefCMakeSelfTest )
 
-# Process cmake file at root of library and use ${CMAKE_CURRENT_BINARY_DIR}/libs/boost_predef as workspace
+# Process cmake file at root of library and use
+# ${CMAKE_CURRENT_BINARY_DIR}/libs/boost_predef as workspace
 add_subdirectory( ../.. ${CMAKE_CURRENT_BINARY_DIR}/libs/boost_predef )
 
+# The executable just includes a predef header to verify that it's used.
 add_executable( boost_predef_cmake_test_prj main.cpp )
 
+# The executable needs to "use" the Predef "library" to get the usage
+# requirements added to the executable build.
 target_link_libraries( boost_predef_cmake_test_prj Boost::predef )
-

test/test_cmake/main.cpp

@@ -1,7 +1,19 @@
-// Dummy executable, just to make sure
-// that we can find the Boost.predef header files
+/*
+Copyright Mike Dev 2018
+Copyright 2018 Rene Rivera
+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
+*/
+
+/*
+Dummy executable, just to make sure that we can find the Boost.predef header
+files.
+*/
+
 #include <boost/predef.h>
 
-int main() {
-
+int main()
+{
+    return 0;
 }