cxxmodules: make export trampoline script files unique

Include the name of the `EXPORT` in the filename when generating export
information for C++ modules. This allows the same directory to be used
for multiple sets of C++ module-using targets.

For `export(TARGETS)` uses, generate a name based on the hash of the
concatenation of the target names involved with the `export()` call.

Fixes: #25609

5 files changed, 73 insertions, 11 deletions

diff --git a/Tests/RunCMake/CXXModules/ExportBuildCxxModules-check.cmake b/Tests/RunCMake/CXXModules/ExportBuildCxxModules-check.cmake
index cb6f6bd..94d4479 100644
--- a/Tests/RunCMake/CXXModules/ExportBuildCxxModules-check.cmake
+++ b/Tests/RunCMake/CXXModules/ExportBuildCxxModules-check.cmake
@@ -1,19 +1,19 @@
 file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/export-modules-targets.cmake" export_script)
 
-if (NOT export_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules/cxx-modules\.cmake"\)]])
+if (NOT export_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules/cxx-modules-exp\.cmake"\)]])
   list(APPEND RunCMake_TEST_FAILED
     "Could not find C++ module property script inclusion")
 endif ()
 
-file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules.cmake" trampoline_script)
+file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules-exp.cmake" trampoline_script)
 
 if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
-  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-[^.]*\.cmake" OPTIONAL\)]])
+  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-exp-[^.]*\.cmake" OPTIONAL\)]])
     list(APPEND RunCMake_TEST_FAILED
       "Could not find C++ module property per-config script inclusion(s)")
   endif ()
 else ()
-  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-[^.]*\.cmake"\)]])
+  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-exp-[^.]*\.cmake"\)]])
     list(APPEND RunCMake_TEST_FAILED
       "Could not find C++ module property per-config script inclusion(s)")
   endif ()
@@ -21,12 +21,12 @@ 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")
+  if (NOT EXISTS "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules-exp-${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)
+  file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules-exp-${config}.cmake" config_script)
 
   if (NOT config_script MATCHES "include\\(\"\\\${CMAKE_CURRENT_LIST_DIR}/target-export-name-${config}\\.cmake\"\\)")
     list(APPEND RunCMake_TEST_FAILED
diff --git a/Tests/RunCMake/CXXModules/ExportBuildCxxModulesTargets-check.cmake b/Tests/RunCMake/CXXModules/ExportBuildCxxModulesTargets-check.cmake
new file mode 100644
index 0000000..0402fd7
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportBuildCxxModulesTargets-check.cmake
@@ -0,0 +1,40 @@
+file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/export-modules-targets.cmake" export_script)
+
+if (NOT export_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules/cxx-modules-7eb8e1b4d8a1\.cmake"\)]])
+  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-7eb8e1b4d8a1.cmake" trampoline_script)
+
+if (RunCMake_GENERATOR_IS_MULTI_CONFIG)
+  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-7eb8e1b4d8a1-[^.]*\.cmake" OPTIONAL\)]])
+    list(APPEND RunCMake_TEST_FAILED
+      "Could not find C++ module property per-config script inclusion(s)")
+  endif ()
+else ()
+  if (NOT trampoline_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-7eb8e1b4d8a1-[^.]*\.cmake"\)]])
+    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 "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules-7eb8e1b4d8a1-${config}.cmake")
+    continue ()
+  endif ()
+  set(any_exists 1)
+
+  file(READ "${RunCMake_TEST_BINARY_DIR}/lib/cmake/export-modules/cxx-modules/cxx-modules-7eb8e1b4d8a1-${config}.cmake" config_script)
+
+  if (NOT config_script MATCHES "include\\(\"\\\${CMAKE_CURRENT_LIST_DIR}/target-export-name-${config}\\.cmake\"\\)")
+    list(APPEND RunCMake_TEST_FAILED
+      "Could not find C++ module per-target property script inclusion")
+  endif ()
+endforeach ()
+
+if (NOT any_exists)
+  list(APPEND RunCMake_TEST_FAILED
+    "No per-configuration target files exist.")
+endif ()
diff --git a/Tests/RunCMake/CXXModules/ExportBuildCxxModulesTargets.cmake b/Tests/RunCMake/CXXModules/ExportBuildCxxModulesTargets.cmake
new file mode 100644
index 0000000..1da6498
--- /dev/null
+++ b/Tests/RunCMake/CXXModules/ExportBuildCxxModulesTargets.cmake
@@ -0,0 +1,21 @@
+enable_language(CXX)
+set(CMAKE_CXX_SCANDEP_SOURCE "")
+
+add_library(export-modules)
+target_sources(export-modules
+  PUBLIC
+    FILE_SET fs TYPE CXX_MODULES FILES
+      sources/module.cxx)
+target_compile_features(export-modules
+  PRIVATE
+    cxx_std_20)
+set_property(TARGET export-modules
+  PROPERTY EXPORT_NAME export-name)
+
+install(TARGETS export-modules
+  EXPORT exp
+  FILE_SET fs DESTINATION "include/cxx/export-modules")
+
+export(TARGETS export-modules
+  FILE "${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
index 9e83fd8..044b037 100644
--- a/Tests/RunCMake/CXXModules/ExportInstallCxxModules-check.cmake
+++ b/Tests/RunCMake/CXXModules/ExportInstallCxxModules-check.cmake
@@ -1,25 +1,25 @@
 file(READ "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/exp.cmake" export_script)
 
-if (NOT export_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules/cxx-modules\.cmake"\)]])
+if (NOT export_script MATCHES [[include\("\${CMAKE_CURRENT_LIST_DIR}/cxx-modules/cxx-modules-exp\.cmake"\)]])
   list(APPEND RunCMake_TEST_FAILED
     "Could not find C++ module property script inclusion")
 endif ()
 
-file(READ "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/cxx-modules/cxx-modules.cmake" trampoline_script)
+file(READ "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/cxx-modules/cxx-modules-exp.cmake" trampoline_script)
 
-if (NOT trampoline_script MATCHES [[file\(GLOB _cmake_cxx_module_includes "\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-\*\.cmake"\)]])
+if (NOT trampoline_script MATCHES [[file\(GLOB _cmake_cxx_module_includes "\${CMAKE_CURRENT_LIST_DIR}/cxx-modules-exp-\*\.cmake"\)]])
   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")
+  if (NOT EXISTS "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/cxx-modules/cxx-modules-exp-${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)
+  file(READ "${RunCMake_TEST_BINARY_DIR}/CMakeFiles/Export/eee57a7e91412f1be699e9b63fa9d601/cxx-modules/cxx-modules-exp-${config}.cmake" config_script)
 
   if (NOT config_script MATCHES "include\\(\"\\\${CMAKE_CURRENT_LIST_DIR}/target-export-name-${config}\\.cmake\"\\)")
     list(APPEND RunCMake_TEST_FAILED
diff --git a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
index b0571ed..0ac60e0 100644
--- a/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
+++ b/Tests/RunCMake/CXXModules/RunCMakeTest.cmake
@@ -88,6 +88,7 @@ run_cmake(InstallBMIGenericArgs)
 run_cmake(InstallBMIIgnore)
 
 run_cmake(ExportBuildCxxModules)
+run_cmake(ExportBuildCxxModulesTargets)
 run_cmake(ExportInstallCxxModules)
 
 # Generator-specific tests.