Fix .travis.yml

... to express their dependency on this library and retrieve any
configuration information such as the include directory, binary
to link to (if any), transitive dependencies, necessary compiler
options or the required c++ standards level.

.travis.yml

@@ -1,4 +1,4 @@
-# Copyright 2016, 2017 Peter Dimov
+# Copyright 2016-2019 Peter Dimov
 # Distributed under the Boost Software License, Version 1.0.
 # (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
 
@@ -22,20 +22,6 @@ matrix:
     - env: BOGUS_JOB=true
 
   include:
-
-      # cmake self-test
-    - 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
-        - git clone --depth 1 https://github.com/boostorg/core.git ../core
-        - git clone --depth 1 https://github.com/boostorg/assert.git ../assert
-
-      script:
-        - mkdir __build__ && cd __build__
-        - cmake ../test/test_cmake
-        - cmake --build .
-
     - os: linux
       compiler: g++
       env: TOOLSET=gcc COMPILER=g++ CXXSTD=03,11
@@ -264,6 +250,15 @@ matrix:
       compiler: clang++
       env: TOOLSET=clang COMPILER=clang++ CXXSTD=03,11,14,1z
 
+    - os: linux
+      compiler: g++
+      env: CMAKE_SUBDIR_TEST=1
+      script:
+      - cd libs/bind/test/cmake_subdir_test && mkdir __build__ && cd __build__
+      - cmake ..
+      - cmake --build .
+      - cmake --build . --target check
+
 install:
   - BOOST_BRANCH=develop && [ "$TRAVIS_BRANCH" == "master" ] && BOOST_BRANCH=master || true
   - cd ..

CMakeLists.txt

@@ -1,9 +1,9 @@
 # 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: CMake support for Boost.Bind is currently experimental at best
-#       and the interface is likely to change in the future
+
+# Partial (add_subdirectory only) and experimental CMake support
+# Subject to change; please do not rely on the contents of this file yet
 
 cmake_minimum_required(VERSION 3.5)
 project(BoostBind LANGUAGES CXX)

test/cmake_subdir_test/CMakeLists.txt

@@ -0,0 +1,20 @@
+# Copyright 2018, 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
+
+cmake_minimum_required(VERSION 3.5)
+
+project(cmake_subdir_test LANGUAGES CXX)
+
+add_subdirectory(../.. boostorg/bind)
+add_subdirectory(../../../assert boostorg/assert)
+add_subdirectory(../../../config boostorg/config)
+add_subdirectory(../../../core boostorg/core)
+
+add_executable(quick ../quick.cpp)
+target_link_libraries(quick Boost::bind Boost::core)
+
+enable_testing()
+add_test(quick quick)
+
+add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)

test/test_cmake/CMakeLists.txt

@@ -1,20 +0,0 @@
-# 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.Bind.
-#       It only tests, if the CMakeLists.txt file in it's root works as expected
-
-cmake_minimum_required( VERSION 3.5 )
-
-project( BoostBindCMakeSelfTest )
-
-add_subdirectory( ../../../config ${CMAKE_CURRENT_BINARY_DIR}/libs/config )
-add_subdirectory( ../../../core ${CMAKE_CURRENT_BINARY_DIR}/libs/core )
-add_subdirectory( ../../../assert ${CMAKE_CURRENT_BINARY_DIR}/libs/assert )
-
-add_subdirectory( ../.. ${CMAKE_CURRENT_BINARY_DIR}/libs/boost_bind )
-
-add_executable( boost_bind_cmake_self_test main.cpp )
-target_link_libraries( boost_bind_cmake_self_test Boost::bind )
-

test/test_cmake/main.cpp

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