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, 18 insertions, 0 deletions

diff --git a/Source/cmGlobalGenerator.cxx b/Source/cmGlobalGenerator.cxx
index 018037c..ee9ea3c 100644
--- a/Source/cmGlobalGenerator.cxx
+++ b/Source/cmGlobalGenerator.cxx
@@ -1381,6 +1381,11 @@ bool cmGlobalGenerator::Compute()
     return false;
   }
 
+  // Add automatically generated sources (e.g. unity build).
+  if (!this->AddAutomaticSources()) {
+    return false;
+  }
+
   // Add generator specific helper commands
   for (cmLocalGenerator* localGen : this->LocalGenerators) {
     localGen->AddHelperCommands();
@@ -1548,6 +1553,19 @@ bool cmGlobalGenerator::QtAutoGen()
 #endif
 }
 
+bool cmGlobalGenerator::AddAutomaticSources()
+{
+  for (cmLocalGenerator* lg : this->LocalGenerators) {
+    for (cmGeneratorTarget* gt : lg->GetGeneratorTargets()) {
+      if (gt->GetType() == cmStateEnums::INTERFACE_LIBRARY) {
+        continue;
+      }
+      lg->AddUnityBuild(gt);
+    }
+  }
+  return true;
+}
+
 cmLinkLineComputer* cmGlobalGenerator::CreateLinkLineComputer(
   cmOutputConverter* outputConverter, cmStateDirectory const& stateDir) const
 {