Unity build: Generate sources during Compute step

The unity build sources need to be added for all generators.  Create
them during `cmGlobalGenerator::Compute` to avoid duplicating the calls
in every generator.  We already handle Qt autogen there too.

Issue: #19789

1 files changed, 2 insertions, 0 deletions

diff --git a/Source/cmGlobalGenerator.h b/Source/cmGlobalGenerator.h
index b7a8ac7cad..9e30b8f40b 100644
--- a/Source/cmGlobalGenerator.h
+++ b/Source/cmGlobalGenerator.h
@@ -503,6 +503,8 @@ protected:
   /// @return true on success
   bool QtAutoGen();
 
+  bool AddAutomaticSources();
+
   std::string SelectMakeProgram(const std::string& makeProgram,
                                 const std::string& makeDefault = "") const;