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, 3 insertions, 2 deletions

diff --git a/Source/cmExportFileGenerator.h b/Source/cmExportFileGenerator.h
index f396e0e..30333d3 100644
--- a/Source/cmExportFileGenerator.h
+++ b/Source/cmExportFileGenerator.h
@@ -187,7 +187,7 @@ protected:
   void GenerateTargetFileSets(cmGeneratorTarget* gte, std::ostream& os,
                               cmTargetExport* te = nullptr);
 
-  void GenerateCxxModuleInformation(std::ostream& os);
+  void GenerateCxxModuleInformation(std::string const& name, std::ostream& os);
 
   virtual std::string GetFileSetDirectories(cmGeneratorTarget* gte,
                                             cmFileSet* fileSet,
@@ -235,5 +235,6 @@ private:
                                      const std::string& config) = 0;
 
   virtual std::string GetCxxModulesDirectory() const = 0;
-  virtual void GenerateCxxModuleConfigInformation(std::ostream& os) const = 0;
+  virtual void GenerateCxxModuleConfigInformation(std::string const&,
+                                                  std::ostream& os) const = 0;
 };