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

1 files changed, 4 insertions, 2 deletions

diff --git a/Source/cmExportInstallFileGenerator.h b/Source/cmExportInstallFileGenerator.h
index e073a31..253a65e 100644
--- a/Source/cmExportInstallFileGenerator.h
+++ b/Source/cmExportInstallFileGenerator.h
@@ -118,8 +118,10 @@ protected:
                               cmTargetExport* te) override;
 
   std::string GetCxxModulesDirectory() const override;
-  void GenerateCxxModuleConfigInformation(std::ostream&) const override;
-  bool GenerateImportCxxModuleConfigTargetInclusion(std::string const&);
+  void GenerateCxxModuleConfigInformation(std::string const&,
+                                          std::ostream&) const override;
+  bool GenerateImportCxxModuleConfigTargetInclusion(std::string const&,
+                                                    std::string const&);
 
   cmInstallExportGenerator* IEGen;