cmExport*FileGenerator: support exporting C++ module properties

C++ module properties will be generated at build time, so generate code
that includes the files actually responsible for the information.

7 files changed, 144 insertions, 0 deletions

diff --git a/Tests/RunCMake/CXXModules/ExportBuildCxxModules-check.cmake b/Tests/RunCMake/CXXModules/ExportBuildCxxModules-check.cmake
new file mode 100644
index 0000000..cb6f6bd
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportBuildCxxModules-check.cmake
@@ -0,0 +1,40 @@
+file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/export-modules-targets.cmake" export_script)
+
+if (NOT export_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules/cxx-modules\.cmake"\)]])
+  list(APPEND RunCMake_TEST_FAILED
+    "Could not find C++ module property script inclusion")
+endif ()
+
+file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules.cmake" trampoline_script)
+
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-[^.]*\.cmake" OPTIONAL\)]])
+    list(APPEND RunCMake_TEST_FAILED
+      "Could not find C++ module property per-config script inclusion(s)")
+  endif ()
+else ()
+  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-[^.]*\.cmake"\)]])
+    list(APPEND RunCMake_TEST_FAILED
+      "Could not find C++ module property per-config script inclusion(s)")
+  endif ()
+endif ()
+
+set(any_exists 0)
+foreach (config IN ITEMS noconfig Debug Release RelWithDebInfo MinSizeRel)
+  if (NOT EXISTS "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules-${config}.cmake")
+    continue ()
+  endif ()
+  set(any_exists 1)
+
+  file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules-${config}.cmake" config_script)
+
+  if (NOT config_script MATCHES "include\\(\"\\\${CMAKE_CURRENT_LIST_DIR}/target-export-name-${config}\\.cmake\"\\)")
+    list(APPEND RunCMake_TEST_FAILED
+      "Could not find C++ module per-target property script inclusion")
+  endif ()
+endforeach ()
+
+if (NOT any_exists)
+  list(APPEND RunCMake_TEST_FAILED
+    "No per-configuration target files exist.")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/ExportBuildCxxModules-stderr.txt b/Tests/RunCMake/CXXModules/ExportBuildCxxModules-stderr.txt
new file mode 100644
index 0000000..c05b0b4
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportBuildCxxModules-stderr.txt
@@ -0,0 +1,11 @@
+CMake Warning \(dev\) at ExportBuildCxxModules.cmake:6 \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:6 \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Warning \(dev\):
+  C\+\+20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP is
+  experimental.  It is meant only for compiler developers to try.
+This warning is for project developers.  Use -Wno-dev to suppress it.
diff --git a/Tests/RunCMake/CXXModules/ExportBuildCxxModules.cmake b/Tests/RunCMake/CXXModules/ExportBuildCxxModules.cmake
new file mode 100644
index 0000000..850f8dc
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportBuildCxxModules.cmake
@@ -0,0 +1,22 @@
+enable_language(CXX)
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)
+set(CMAKE_EXPERIMENTAL_CXX_SCANDEP_SOURCE "")
+
+add_library(export-modules)
+target_sources(export-modules
+  PUBLIC
+    FILE_SET fs TYPE CXX_MODULES FILES
+      sources/module.cxx)
+target_compile_features(export-modules
+  PRIVATE
+    cxx_std_20)
+set_property(TARGET export-modules
+  PROPERTY EXPORT_NAME export-name)
+
+install(TARGETS export-modules
+  EXPORT exp
+  FILE_SET fs DESTINATION "include/cxx/export-modules")
+
+export(EXPORT exp
+  FILE "${CMAKE_BINARY_DIR}/lib/cmake/export-modules/export-modules-targets.cmake"
+  CXX_MODULES_DIRECTORY "cxx-modules")
diff --git a/Tests/RunCMake/CXXModules/ExportInstallCxxModules-check.cmake b/Tests/RunCMake/CXXModules/ExportInstallCxxModules-check.cmake
new file mode 100644
index 0000000..9e83fd8
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportInstallCxxModules-check.cmake
@@ -0,0 +1,35 @@
+file(READ "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/exp.cmake" export_script)
+
+if (NOT export_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules/cxx-modules\.cmake"\)]])
+  list(APPEND RunCMake_TEST_FAILED
+    "Could not find C++ module property script inclusion")
+endif ()
+
+file(READ "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/cxx-modules/cxx-modules.cmake" trampoline_script)
+
+if (NOT trampoline_script MATCHES [[file\(GLOB _cmake_cxx_module_includes "\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-\*\.cmake"\)]])
+  list(APPEND RunCMake_TEST_FAILED
+    "Could not find C++ module property per-config script inclusion(s)")
+endif ()
+
+set(any_exists 0)
+foreach (config IN ITEMS noconfig Debug Release RelWithDebInfo MinSizeRel)
+  if (NOT EXISTS "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/cxx-modules/cxx-modules-${config}.cmake")
+    continue ()
+  endif ()
+  set(any_exists 1)
+
+  file(READ "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/cxx-modules/cxx-modules-${config}.cmake" config_script)
+
+  if (NOT config_script MATCHES "include\\(\"\\\${CMAKE_CURRENT_LIST_DIR}/target-export-name-${config}\\.cmake\"\\)")
+    list(APPEND RunCMake_TEST_FAILED
+      "Could not find C++ module per-target property script inclusion")
+  endif ()
+endforeach ()
+
+if (NOT any_exists)
+  list(APPEND RunCMake_TEST_FAILED
+    "No per-configuration target files exist.")
+endif ()
+
+string(REPLACE ";" "; " RunCMake_TEST_FAILED "${RunCMake_TEST_FAILED}")
diff --git a/Tests/RunCMake/CXXModules/ExportInstallCxxModules-stderr.txt b/Tests/RunCMake/CXXModules/ExportInstallCxxModules-stderr.txt
new file mode 100644
index 0000000..4fe27a9
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportInstallCxxModules-stderr.txt
@@ -0,0 +1,11 @@
+CMake Warning \(dev\) at ExportInstallCxxModules.cmake:6 \(target_sources\):
+  CMake's C\+\+ module support is experimental.  It is meant only for
+  experimentation and feedback to CMake developers.
+Call Stack \(most recent call first\):
+  CMakeLists.txt:6 \(include\)
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Warning \(dev\):
+  C\+\+20 modules support via CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP is
+  experimental.  It is meant only for compiler developers to try.
+This warning is for project developers.  Use -Wno-dev to suppress it.
diff --git a/Tests/RunCMake/CXXModules/ExportInstallCxxModules.cmake b/Tests/RunCMake/CXXModules/ExportInstallCxxModules.cmake
new file mode 100644
index 0000000..234a4b5
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportInstallCxxModules.cmake
@@ -0,0 +1,22 @@
+enable_language(CXX)
+set(CMAKE_EXPERIMENTAL_CXX_MODULE_DYNDEP 1)
+set(CMAKE_EXPERIMENTAL_CXX_SCANDEP_SOURCE "")
+
+add_library(export-modules)
+target_sources(export-modules
+  PUBLIC
+    FILE_SET fs TYPE CXX_MODULES FILES
+      sources/module.cxx)
+target_compile_features(export-modules
+  PRIVATE
+    cxx_std_20)
+set_property(TARGET export-modules
+  PROPERTY EXPORT_NAME export-name)
+
+install(TARGETS export-modules
+  EXPORT exp
+  FILE_SET fs DESTINATION "include/cxx/export-modules")
+
+install(EXPORT exp
+  DESTINATION "lib/cmake/export-modules"
+  CXX_MODULES_DIRECTORY "cxx-modules")
diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
index 7c93100..a4b67fd 100644
--- a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -71,6 +71,9 @@ run_cmake(InstallBMI)
 run_cmake(InstallBMIGenericArgs)
 run_cmake(InstallBMIIgnore)
 
+run_cmake(ExportBuildCxxModules)
+run_cmake(ExportInstallCxxModules)
+
 # Actual compilation tests.
 if (NOT CMake_TEST_MODULE_COMPILATION)
   return ()