install: support CXX_MODULES_BMI installation bits

Source/cmInstallCxxModuleBmiGenerator.h

@@ -0,0 +1,52 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#pragma once
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include <iosfwd>
+#include <string>
+#include <vector>
+
+#include "cmInstallGenerator.h"
+#include "cmScriptGenerator.h"
+
+class cmGeneratorTarget;
+class cmListFileBacktrace;
+class cmLocalGenerator;
+
+/** \class cmInstallCxxModuleBmiGenerator
+ * \brief Generate C++ module BMI installation rules.
+ */
+class cmInstallCxxModuleBmiGenerator : public cmInstallGenerator
+{
+public:
+  cmInstallCxxModuleBmiGenerator(
+    std::string target, std::string const& dest, std::string file_permissions,
+    std::vector<std::string> const& configurations,
+    std::string const& component, MessageLevel message, bool exclude_from_all,
+    bool optional, cmListFileBacktrace backtrace);
+  ~cmInstallCxxModuleBmiGenerator() override;
+
+  bool Compute(cmLocalGenerator* lg) override;
+
+  std::string const& GetFilePermissions() const
+  {
+    return this->FilePermissions;
+  }
+  std::string GetDestination(std::string const& config) const;
+  std::string GetScriptLocation(std::string const& config) const;
+  cmGeneratorTarget const* GetTarget() const { return this->Target; }
+  bool GetOptional() const { return this->Optional; }
+  MessageLevel GetMessageLevel() const { return this->Message; }
+
+protected:
+  void GenerateScriptForConfig(std::ostream& os, const std::string& config,
+                               Indent indent) override;
+
+  std::string const TargetName;
+  cmGeneratorTarget const* Target = nullptr;
+  cmLocalGenerator* LocalGenerator = nullptr;
+  std::string const FilePermissions;
+  bool const Optional;
+};