Merge pull request #99 from nigels-com/cmake-standalone

cmake: Add standalone build support for building and running unit tests

CMakeLists.txt

@@ -1,11 +1,24 @@
 # Generated by `boostdep --cmake sort`
 # Copyright 2020 Peter Dimov
+# Copyright 2025 Nigel Stewart
 # Distributed under the Boost Software License, Version 1.0.
 # https://www.boost.org/LICENSE_1_0.txt
 
-cmake_minimum_required(VERSION 3.5...3.16)
+message(STATUS "Using cmake version ${CMAKE_VERSION}")
 
-project(boost_sort VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
+cmake_minimum_required(VERSION 3.10...3.16)
+
+if(BOOST_SUPERPROJECT_VERSION)
+  project(boost_sort VERSION "${BOOST_SUPERPROJECT_VERSION}" LANGUAGES CXX)
+else()
+  project(boost_sort LANGUAGES CXX)
+endif()
+
+# Test coverage in stand-alone mode requires boost dependencies
+if(BUILD_TESTING AND NOT BOOST_SUPERPROJECT_VERSION)
+  set(Boost_DEBUG ON)
+  find_package(Boost 1.85 REQUIRED COMPONENTS core range included_test_exec_monitor)
+endif()
 
 add_library(boost_sort INTERFACE)
 add_library(Boost::sort ALIAS boost_sort)
@@ -21,8 +34,17 @@ target_link_libraries(boost_sort
     Boost::type_traits
 )
 
+# Testing
 if(BUILD_TESTING AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt")
 
-  add_subdirectory(test)
+  if(NOT BOOST_SUPERPROJECT_VERSION)
+    include(CTest)
+    enable_testing()
+    add_custom_target(check COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)
+    add_dependencies(check tests)
+  endif()
 
+  # Follow the Boost convention: don't build test targets by default,
+  # and only when explicitly requested by building target tests
+  add_subdirectory(test EXCLUDE_FROM_ALL)
 endif()