VS: Generate a custom command only in the least dependent target

If a custom command is assigned to multiple targets, generate the build
rule only in the least-dependent `.vcxproj` file.  Otherwise MSBuild
will run the command on the first build of a dependent target even if
its dependencies already brought the command up to date (in order to
populates its build log).

Generate targets in least-to-most-dependent order, and assign a custom
command to the least dependent target.

Added cmLocalVisualStudio10Generator::GenerateTargetsDepthFirst to call
cmVisualStudio10TargetGenerator::Generate in least-dependent order.

Moved SourcesVisited from cmVisualStudio10TargetGenerator to
cmLocalVisualStudio10Generator to avoid attaching a custom command to
multiple targets among the local generator.

Fixes: #16767

1 files changed, 9 insertions, 0 deletions

diff --git a/Source/cmLocalVisualStudio10Generator.h b/Source/cmLocalVisualStudio10Generator.h
index bcdc307..a4150b9 100644
--- a/Source/cmLocalVisualStudio10Generator.h
+++ b/Source/cmLocalVisualStudio10Generator.h
@@ -33,10 +33,19 @@ public:
   void ReadAndStoreExternalGUID(const std::string& name,
                                 const char* path) override;
 
+  std::set<cmSourceFile const*>& GetSourcesVisited(cmGeneratorTarget* target)
+  {
+    return SourcesVisited[target];
+  };
+
 protected:
   const char* ReportErrorLabel() const override;
   bool CustomCommandUseLocal() const override { return true; }
 
 private:
+  void GenerateTargetsDepthFirst(cmGeneratorTarget* target,
+                                 std::vector<cmGeneratorTarget*>& remaining);
+
+  std::map<cmGeneratorTarget*, std::set<cmSourceFile const*>> SourcesVisited;
 };
 #endif