[codex] Reuse existing event hub target

.github/workflows/ci.yml

@@ -89,3 +89,33 @@ jobs:
 
       - name: Test
         run: ctest --test-dir build --output-on-failure
+
+  build-with-parent-event-hub:
+    name: build-with-parent-event-hub-${{ matrix.platform }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: linux
+            os: ubuntu-22.04
+          - platform: windows
+            os: windows-latest
+          - platform: macos
+            os: macos-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - name: Configure parent-provided event hub fixture
+        run: >
+          cmake -S tests/cmake/parent_event_hub -B build-parent-event-hub -G Ninja
+
+      - name: Build parent-provided event hub fixture
+        run: cmake --build build-parent-event-hub --parallel
+
+      - name: Test parent-provided event hub fixture
+        run: ctest --test-dir build-parent-event-hub --output-on-failure

CMakeLists.txt

@@ -66,14 +66,16 @@ if(CONSOLIX_USE_CXXOPTS)
 endif()
 
 if(CONSOLIX_USE_EVENT_HUB)
-    set(EVENT_HUB_CPP_BUILD_EXAMPLES OFF CACHE BOOL "Build event-hub-cpp examples" FORCE)
-    set(EVENT_HUB_CPP_BUILD_TESTS OFF CACHE BOOL "Build event-hub-cpp tests" FORCE)
-    set(EVENT_HUB_CPP_USE_TIME_SHIELD OFF CACHE BOOL "Enable optional time-shield-cpp integration" FORCE)
-
-    add_subdirectory(
-        ${CMAKE_CURRENT_SOURCE_DIR}/external/event-hub-cpp
-        ${CMAKE_CURRENT_BINARY_DIR}/external/event-hub-cpp
-    )
+    if(NOT TARGET event_hub::event_hub)
+        set(EVENT_HUB_CPP_BUILD_EXAMPLES OFF CACHE BOOL "Build event-hub-cpp examples" FORCE)
+        set(EVENT_HUB_CPP_BUILD_TESTS OFF CACHE BOOL "Build event-hub-cpp tests" FORCE)
+        set(EVENT_HUB_CPP_USE_TIME_SHIELD OFF CACHE BOOL "Enable optional time-shield-cpp integration" FORCE)
+
+        add_subdirectory(
+            ${CMAKE_CURRENT_SOURCE_DIR}/external/event-hub-cpp
+            ${CMAKE_CURRENT_BINARY_DIR}/external/event-hub-cpp
+        )
+    endif()
     target_link_libraries(Consolix INTERFACE event_hub::event_hub)
 endif()
 

tests/cmake/parent_event_hub/CMakeLists.txt

@@ -0,0 +1,31 @@
+cmake_minimum_required(VERSION 3.14)
+
+project(consolix_parent_event_hub LANGUAGES CXX)
+
+add_library(event_hub_cpp INTERFACE)
+add_library(event_hub::event_hub ALIAS event_hub_cpp)
+
+set(CONSOLIX_CXX_STANDARD 17 CACHE STRING "" FORCE)
+set(CONSOLIX_USE_LOGIT OFF CACHE BOOL "" FORCE)
+set(CONSOLIX_USE_JSON OFF CACHE BOOL "" FORCE)
+set(CONSOLIX_USE_CXXOPTS OFF CACHE BOOL "" FORCE)
+set(CONSOLIX_USE_EVENT_HUB ON CACHE BOOL "" FORCE)
+set(CONSOLIX_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
+set(CONSOLIX_BUILD_TESTS OFF CACHE BOOL "" FORCE)
+add_subdirectory(
+    "${CMAKE_CURRENT_LIST_DIR}/../../.."
+    "${CMAKE_CURRENT_BINARY_DIR}/consolix"
+)
+
+get_target_property(consolix_link_libraries Consolix INTERFACE_LINK_LIBRARIES)
+if(NOT "event_hub::event_hub" IN_LIST consolix_link_libraries)
+    message(FATAL_ERROR "Consolix must link the parent-provided event hub target")
+endif()
+
+add_custom_target(parent_event_hub_target_smoke ALL)
+
+enable_testing()
+add_test(
+    NAME parent_event_hub_target_smoke
+    COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target parent_event_hub_target_smoke
+)