dlopen: make sure lib is built before running test

Author: jll63

doc/modules/ROOT/examples/shared_libs/CMakeLists.txt

@@ -7,6 +7,19 @@ message(STATUS "Boost.OpenMethod: building shared library examples")
 
 add_compile_definitions(BOOST_OPENMETHOD_ENABLE_RUNTIME_CHECKS)
 
+# All targets output to the same directory so that executables can locate shared
+# libraries via boost::dll::program_location().parent_path().
+set(shared_libs_output_dir "${CMAKE_CURRENT_BINARY_DIR}")
+
+# Helper: add a CTest fixture that builds a CMake target, so that `ctest` alone
+# (without a prior `cmake --build`) still works.
+function(openmethod_shared_libs_build_fixture target)
+    add_test(NAME ${target}-build
+        COMMAND "${CMAKE_COMMAND}" --build "${CMAKE_BINARY_DIR}"
+                --target ${target} --config $<CONFIG>)
+    set_tests_properties(${target}-build PROPERTIES FIXTURES_SETUP ${target}-fixture)
+endfunction()
+
 # ------------------------------------------------------------------------------
 # static linking
 
@@ -15,21 +28,38 @@ target_link_libraries(boost_openmethod-shared Boost::openmethod)
 set_target_properties(boost_openmethod-shared PROPERTIES
     ENABLE_EXPORTS ON
     OUTPUT_NAME shared
+    LIBRARY_OUTPUT_DIRECTORY "${shared_libs_output_dir}"
+    RUNTIME_OUTPUT_DIRECTORY "${shared_libs_output_dir}"
 )
 
 add_executable(boost_openmethod-static static_main.cpp)
 target_link_libraries(boost_openmethod-static Boost::openmethod Boost::dll boost_openmethod-shared)
-add_test(NAME boost_openmethod-static COMMAND boost_openmethod-static)
+set_target_properties(boost_openmethod-static PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY "${shared_libs_output_dir}"
+)
+openmethod_shared_libs_build_fixture(boost_openmethod-static)
+add_test(NAME boost_openmethod-static
+    COMMAND "${shared_libs_output_dir}/boost_openmethod-static")
+set_tests_properties(boost_openmethod-static PROPERTIES
+    FIXTURES_REQUIRED boost_openmethod-static-fixture)
 
 # ------------------------------------------------------------------------------
 # dynamic loading, direct virtual_ptrs
 
 add_executable(boost_openmethod-dynamic dynamic_main.cpp)
-set_target_properties(boost_openmethod-dynamic PROPERTIES ENABLE_EXPORTS ON)
+set_target_properties(boost_openmethod-dynamic PROPERTIES
+    ENABLE_EXPORTS ON
+    RUNTIME_OUTPUT_DIRECTORY "${shared_libs_output_dir}"
+)
 target_link_libraries(boost_openmethod-dynamic Boost::openmethod Boost::dll)
 add_dependencies(boost_openmethod-dynamic boost_openmethod-shared)
 if (NOT WIN32)
-    add_test(NAME boost_openmethod-dynamic COMMAND boost_openmethod-dynamic)
+    openmethod_shared_libs_build_fixture(boost_openmethod-shared)
+    openmethod_shared_libs_build_fixture(boost_openmethod-dynamic)
+    add_test(NAME boost_openmethod-dynamic
+        COMMAND "${shared_libs_output_dir}/boost_openmethod-dynamic")
+    set_tests_properties(boost_openmethod-dynamic PROPERTIES
+        FIXTURES_REQUIRED "boost_openmethod-shared-fixture;boost_openmethod-dynamic-fixture")
 endif()
 
 # ------------------------------------------------------------------------------
@@ -42,14 +72,23 @@ target_link_libraries(boost_openmethod-indirect_shared PRIVATE Boost::openmethod
 set_target_properties(boost_openmethod-indirect_shared PROPERTIES
     ENABLE_EXPORTS ON
     OUTPUT_NAME indirect_shared
+    LIBRARY_OUTPUT_DIRECTORY "${shared_libs_output_dir}"
+    RUNTIME_OUTPUT_DIRECTORY "${shared_libs_output_dir}"
 )
 
 add_executable(boost_openmethod-indirect indirect_main.cpp)
 target_compile_definitions(
     boost_openmethod-indirect PUBLIC BOOST_OPENMETHOD_DEFAULT_REGISTRY=indirect_registry)
-set_target_properties(boost_openmethod-indirect PROPERTIES ENABLE_EXPORTS ON)
+set_target_properties(boost_openmethod-indirect PROPERTIES
+    ENABLE_EXPORTS ON
+    RUNTIME_OUTPUT_DIRECTORY "${shared_libs_output_dir}"
+)
 target_link_libraries(boost_openmethod-indirect PRIVATE Boost::openmethod Boost::dll)
 add_dependencies(boost_openmethod-indirect boost_openmethod-indirect_shared)
 if (NOT WIN32)
-  add_test(NAME boost_openmethod-indirect COMMAND boost_openmethod-indirect)
+    openmethod_shared_libs_build_fixture(boost_openmethod-indirect)
+    add_test(NAME boost_openmethod-indirect
+        COMMAND "${shared_libs_output_dir}/boost_openmethod-indirect")
+    set_tests_properties(boost_openmethod-indirect PROPERTIES
+        FIXTURES_REQUIRED boost_openmethod-indirect-fixture)
 endif()