Allow to install tom11 library with CMake.

Add option to build tests.

CMakeLists.txt

@@ -1,7 +1,17 @@
 cmake_minimum_required(VERSION 2.8)
 enable_testing()
+
 project(toml11)
 
+set(toml11_VERSION_MAYOR  2)
+set(toml11_VERSION_MINOR  3)
+set(toml11_VERSION_PATCH  1)
+set(toml11_VERSION
+  "${toml11_VERSION_MAYOR}.${toml11_VERSION_MINOR}.${toml11_VERSION_PATCH}"
+)
+
+option(toml11_BUILD_TEST "Build toml tests" ON)
+
 include(CheckCXXCompilerFlag)
 if("${CMAKE_VERSION}" VERSION_GREATER 3.1)
     set(CMAKE_CXX_EXTENSIONS OFF)
@@ -34,5 +44,62 @@ else()
     endif()
 endif()
 
-include_directories(${PROJECT_SOURCE_DIR})
+# Set some common directories
+include(GNUInstallDirs)
+set(toml11_install_cmake_dir         ${CMAKE_INSTALL_LIBDIR}/cmake/toml11)
+set(toml11_install_include_dir       ${CMAKE_INSTALL_INCLUDEDIR})
+set(toml11_config_dir                ${CMAKE_CURRENT_BINARY_DIR}/cmake/)
+set(toml11_config                    ${toml11_config_dir}/toml11Config.cmake)
+set(toml11_config_version            ${toml11_config_dir}/toml11ConfigVersion.cmake)
+
+add_library(toml11 INTERFACE)
+target_include_directories(toml11 INTERFACE 
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+  $<INSTALL_INTERFACE:${toml11_install_include_dir}>
+)
+add_library(toml11::toml11 ALIAS toml11)
+
+# Write config and version config files
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+  ${toml11_config_version}
+  VERSION ${toml11_VERSION}
+  COMPATIBILITY SameMajorVersion
+)
+
+configure_package_config_file(
+    cmake/toml11Config.cmake.in
+    ${toml11_config}
+    INSTALL_DESTINATION ${toml11_install_cmake_dir} 
+    PATH_VARS toml11_install_cmake_dir
+)  
+
+# Install config files
+install(FILES ${toml11_config} ${toml11_config_version}
+  DESTINATION ${toml11_install_cmake_dir}
+)
+
+# Install header files
+install(
+  FILES toml.hpp
+  DESTINATION "${toml11_install_include_dir}" 
+)
+install(
+  DIRECTORY "toml" 
+  DESTINATION "${toml11_install_include_dir}" 
+  FILES_MATCHING PATTERN "*.hpp"
+)
+
+# Export targets and install them
+install(TARGETS toml11
+  EXPORT toml11Targets
+)
+install(EXPORT toml11Targets 
+  FILE toml11Targets.cmake
+  DESTINATION ${toml11_install_cmake_dir} 
+  NAMESPACE toml11::
+)
+
+if (toml11_BUILD_TEST)
 add_subdirectory(tests)
+endif ()

cmake/toml11Config.cmake.in

@@ -0,0 +1,2 @@
+@PACKAGE_INIT@
+include("@PACKAGE_toml11_install_cmake_dir@/toml11Targets.cmake")

tests/CMakeLists.txt

@@ -88,7 +88,7 @@ add_definitions(-DUNITTEST_FRAMEWORK_LIBRARY_EXIST)
 
 foreach(TEST_NAME ${TEST_NAMES})
     add_executable(${TEST_NAME} ${TEST_NAME}.cpp)
-    target_link_libraries(${TEST_NAME} ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY})
+    target_link_libraries(${TEST_NAME} ${Boost_UNIT_TEST_FRAMEWORK_LIBRARY} toml11::toml11)
     target_include_directories(${TEST_NAME} PRIVATE ${Boost_INCLUDE_DIRS})
     add_test(NAME ${TEST_NAME} COMMAND ${TEST_NAME} WORKING_DIRECTORY ${PROJECT_BINARY_DIR})
 
@@ -105,3 +105,4 @@ endforeach(TEST_NAME)
 add_executable(test_multiple_translation_unit
                test_multiple_translation_unit_1.cpp
                test_multiple_translation_unit_2.cpp)
+target_link_libraries(test_multiple_translation_unit toml11::toml11)