[CMake] Add test for cmake file

.travis.yml

@@ -17,6 +17,18 @@ branches:
     - master
     - develop
 
+matrix:
+  include:
+    - os: linux
+      env: TEST_CMAKE=TRUE #Only for easier identification in travis web gui
+      install:
+        - git clone --depth 1 https://github.com/boostorg/config.git ../config
+
+      script:
+        - mkdir __build__ && cd __build__
+        - cmake ../test/test_cmake
+        - cmake --build .
+
 install:
   - cd ..
   - git clone -b $TRAVIS_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root

test/test_cmake/CMakeLists.txt

@@ -0,0 +1,16 @@
+# 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.IO.
+#       It only tests, if the CMakeLists.txt file in it's root works as expected
+
+cmake_minimum_required( VERSION 3.5 )
+
+project( BoostIoCMakeSelfTest )
+
+add_subdirectory( ../../../config ${CMAKE_CURRENT_BINARY_DIR}/libs/config )
+add_subdirectory( ../.. ${CMAKE_CURRENT_BINARY_DIR}/libs/io )
+
+add_executable( boost_io_cmake_self_test main.cpp )
+target_link_libraries( boost_io_cmake_self_test Boost::io )

test/test_cmake/main.cpp

@@ -0,0 +1,5 @@
+#include <boost/io/ios_state.hpp>
+#include <boost/io_fwd.hpp>
+
+int main() {
+}