cxxmodules: generate synthetic targets as an initial pass

We need to be able to construct BMIs that will be usable from the client
modules for the target importing the module, so create BMI-only
compilation rules for `IMPORTED` targets to create these BMIs.

1 files changed, 6 insertions, 0 deletions

diff --git a/Source/cmGeneratorTarget.h b/Source/cmGeneratorTarget.h
index 3adf5b8..f347133 100644
--- a/Source/cmGeneratorTarget.h
+++ b/Source/cmGeneratorTarget.h
@@ -31,6 +31,7 @@ class cmGlobalGenerator;
 class cmLocalGenerator;
 class cmMakefile;
 class cmSourceFile;
+struct cmSyntheticTargetCache;
 class cmTarget;
 
 struct cmGeneratorExpressionContext;
@@ -932,6 +933,9 @@ public:
 
   std::string GetImportedXcFrameworkPath(const std::string& config) const;
 
+  bool DiscoverSyntheticTargets(cmSyntheticTargetCache& cache,
+                                std::string const& config);
+
 private:
   void AddSourceCommon(const std::string& src, bool before = false);
 
@@ -1307,6 +1311,8 @@ private:
   {
     bool BuiltFileSetCache = false;
     std::map<std::string, cmFileSet const*> FileSetCache;
+    std::map<cmGeneratorTarget const*, std::vector<cmGeneratorTarget const*>>
+      SyntheticDeps;
   };
   mutable std::map<std::string, InfoByConfig> Configs;
 };