[CMake] Add self-test for cmake file to travis

.travis.yml

@@ -17,6 +17,15 @@ branches:
     - master
     - develop
 
+matrix:
+  include:
+    - install: true
+      script:
+        - mkdir __build__ && cd __build__
+        - cmake ../test
+        - cmake --build .
+
+
 install:
   - cd ..
   - git clone -b $TRAVIS_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root

CMakeLists.txt

@@ -9,3 +9,4 @@ add_library(boost_preprocessor INTERFACE)
 add_library(Boost::preprocessor ALIAS boost_preprocessor)
 
 target_include_directories(boost_preprocessor INTERFACE include)
+

test/CMakeLists.txt

@@ -0,0 +1,18 @@
+# Copyright 2018 Mike Dev
+# 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.PReprocessor.
+#       It only tests, if the CMakeLists.txt file works as expected
+
+cmake_minimum_required( VERSION 3.5 )
+
+project( TestBoostPreprocessorCMakeSelfTest )
+
+add_subdirectory( .. ${CMAKE_CURRENT_BINARY_DIR}/boost_preprocessor )
+
+# arithmetic.cpp is a randomly chosen source file
+# that is compilable on it's own.
+add_executable( boost_preprocessor_self_test cmake_self_test.cpp )
+target_link_libraries( boost_preprocessor_self_test Boost::preprocessor )
+

test/cmake_self_test.cpp

@@ -0,0 +1,3 @@
+#include <boost/preprocessor.hpp>
+
+int main() {}