Merge topic 'cxxmodules-nmc-duplicate-synthetic-targets'

5261af9424 cmGeneratorTarget: store synthetic targets in its cache
e0633a9517 Tests/CXXModules: add a test importing from a `Ninja` install
150d7dbd68 Tests/CXXModules: support building a project with `Ninja`
e48e5e5506 Tests/CXXModules: document `CMake_TEST_MODULE_COMPILATION` items

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !9263

Source/cmGeneratorTarget.cxx

@@ -8477,6 +8477,7 @@ bool cmGeneratorTarget::DiscoverSyntheticTargets(cmSyntheticTargetCache& cache,
         // Create the generator target and attach it to the local generator.
         auto gtp = cm::make_unique<cmGeneratorTarget>(tgt, lg);
         synthDep = gtp.get();
+        cache.CxxModuleTargets[targetName] = synthDep;
         lg->AddGeneratorTarget(std::move(gtp));
       } else {
         synthDep = cached->second;

Tests/RunCMake/CXXModules/RunCMakeTest.cmake

@@ -168,7 +168,25 @@ function (run_cxx_module_test_rebuild directory)
   run_cxx_module_test("${directory}" ${ARGN})
 endfunction ()
 
+# Module compilation features:
+# Compiler-based:
+# - `named`: basic support for named modules is available
+# - `shared`: shared libraries are supported
+# - `partitions`: module partitions are supported
+# - `internal_partitions`: internal module partitions are supported
+# - `bmionly`: the compiler supports BMI-only builds
+#
+# Generator-based:
+# - `compile_commands`: the generator supports `compile_commands.json`
+# - `collation`: the generator supports module collation features
+# - `export_bmi`: the generator supports exporting BMIs
+# - `ninja`: a `ninja` binary is available to perform `Ninja`-only testing
+#   (assumed if the generator matches `Ninja`).
 string(REPLACE "," ";" CMake_TEST_MODULE_COMPILATION "${CMake_TEST_MODULE_COMPILATION}")
+if (RunCMake_GENERATOR MATCHES "Ninja")
+  list(APPEND CMake_TEST_MODULE_COMPILATION
+    "ninja")
+endif ()
 
 if (RunCMake_GENERATOR MATCHES "Ninja")
   if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
@@ -294,3 +312,30 @@ if ("install_bmi" IN_LIST CMake_TEST_MODULE_COMPILATION)
     endif ()
   endif ()
 endif ()
+
+# All remaining tests require a working `Ninja` generator to set up a test case
+# for the current generator.
+if (NOT "ninja" IN_LIST CMake_TEST_MODULE_COMPILATION)
+  return ()
+endif ()
+# All remaining tests require `bmionly` in order to consume from the `ninja`
+# build.
+if (NOT "bmionly" IN_LIST CMake_TEST_MODULE_COMPILATION)
+  return ()
+endif ()
+
+function (run_cxx_module_test_ninja directory)
+  set(RunCMake_GENERATOR "Ninja")
+  set(RunCMake_CXXModules_NO_TEST 1)
+  set(RunCMake_CXXModules_INSTALL 1)
+  # `Ninja` is not a multi-config generator.
+  set(RunCMake_GENERATOR_IS_MULTI_CONFIG 0)
+  run_cxx_module_test("${directory}" "${directory}-ninja" ${ARGN})
+endfunction ()
+
+# Installation happens within `run_cxx_module_test_ninja`.
+set(RunCMake_CXXModules_INSTALL 0)
+
+set(test_set modules-from-ninja)
+run_cxx_module_test_ninja("export-${test_set}")
+run_cxx_module_test(import-modules "import-${test_set}" "-DCMAKE_PREFIX_PATH=${RunCMake_BINARY_DIR}/examples/export-${test_set}-ninja-install" -DFROM_NINJA=1)

Tests/RunCMake/CXXModules/examples/export-modules-from-ninja/CMakeLists.txt

@@ -0,0 +1,41 @@
+cmake_minimum_required(VERSION 3.24...3.28)
+project(cxx_modules_export_from_ninja CXX)
+
+include("${CMAKE_SOURCE_DIR}/../cxx-modules-rules.cmake")
+
+add_library(export_from_ninja STATIC)
+target_sources(export_from_ninja
+  PRIVATE
+    forward.cxx
+  PRIVATE
+    FILE_SET modules_private TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        private.cxx
+  PUBLIC
+    FILE_SET modules TYPE CXX_MODULES
+      BASE_DIRS
+        "${CMAKE_CURRENT_SOURCE_DIR}"
+      FILES
+        importable.cxx
+        subdir/importable.cxx
+  )
+target_compile_features(export_from_ninja PUBLIC cxx_std_20)
+
+add_library(no_modules STATIC no_modules.cxx)
+
+install(TARGETS export_from_ninja no_modules
+  EXPORT CXXModules
+  FILE_SET modules DESTINATION "lib/cxx/miu")
+install(EXPORT CXXModules
+  NAMESPACE CXXModules::
+  DESTINATION "lib/cmake/export_from_ninja"
+  FILE "export_from_ninja-targets.cmake"
+  CXX_MODULES_DIRECTORY "export_from_ninja-cxx-modules")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/export_from_ninja-config.cmake"
+  "include(\"\${CMAKE_CURRENT_LIST_DIR}/export_from_ninja-targets.cmake\")
+set(\${CMAKE_FIND_PACKAGE_NAME}_FOUND 1)
+")
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/export_from_ninja-config.cmake"
+  DESTINATION "lib/cmake/export_from_ninja")

Tests/RunCMake/CXXModules/examples/export-modules-from-ninja/forward.cxx

@@ -0,0 +1,6 @@
+import priv;
+
+int forwarding()
+{
+  return from_private();
+}

Tests/RunCMake/CXXModules/examples/export-modules-from-ninja/importable.cxx

@@ -0,0 +1,10 @@
+export module importable;
+
+extern "C++" {
+int forwarding();
+}
+
+export int from_import()
+{
+  return forwarding();
+}

Tests/RunCMake/CXXModules/examples/export-modules-from-ninja/no_modules.cxx

@@ -0,0 +1,3 @@
+void no_modules()
+{
+}

Tests/RunCMake/CXXModules/examples/export-modules-from-ninja/private.cxx

@@ -0,0 +1,6 @@
+export module priv;
+
+export int from_private()
+{
+  return 0;
+}

Tests/RunCMake/CXXModules/examples/export-modules-from-ninja/subdir/importable.cxx

@@ -0,0 +1,6 @@
+export module subdir_importable;
+
+export int from_subdir()
+{
+  return 0;
+}

Tests/RunCMake/CXXModules/examples/import-modules/CMakeLists.txt

@@ -9,6 +9,8 @@ elseif (WITH_BMIS)
   set(package_name "export_bmi_and_interfaces")
 elseif (INCLUDE_PROPERTIES)
   set(package_name "export_include_directories")
+elseif (FROM_NINJA)
+  set(package_name "export_from_ninja")
 else ()
   set(package_name "export_interfaces")
 endif ()