Add test/cmake_subdir_test

Author: pdimov

test/cmake_subdir_test/CMakeLists.txt

@@ -0,0 +1,18 @@
+# Copyright 2018, 2019, 2026 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...3.31)
+
+project(cmake_subdir_test LANGUAGES CXX)
+
+add_subdirectory(../.. boostorg/circular_buffer)
+add_subdirectory(../../../config boostorg/config)
+
+add_executable(main main.cpp)
+target_link_libraries(main Boost::circular_buffer)
+
+enable_testing()
+add_test(main main)
+
+add_custom_target(check VERBATIM COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure -C $<CONFIG>)

test/cmake_subdir_test/main.cpp

@@ -0,0 +1,11 @@
+//  Copyright 2026 Peter Dimov
+//  Distributed under the Boost Software License, Version 1.0.
+//  http://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/circular_buffer.hpp>
+
+int main()
+{
+    boost::circular_buffer<int> cb;
+    return cb.empty()? 0: 1;
+}