cmNinjaTargetGenerator: handle object-referencing Fortran modules

Targets only using Fortran modules via `$<TARGET_OBJECTS>` also need a
collation step to be performed. Check for this case and trigger the
collation rule to be added and used.

1 files changed, 9 insertions, 0 deletions

diff --git a/Source/cmNinjaTargetGenerator.cxx b/Source/cmNinjaTargetGenerator.cxx
index dabb078..f6b51aa 100644
--- a/Source/cmNinjaTargetGenerator.cxx
+++ b/Source/cmNinjaTargetGenerator.cxx
@@ -1175,6 +1175,15 @@ void cmNinjaTargetGenerator::WriteObjectBuildStatements(
     }
   }
 
+  // Check if there are Fortran objects which need to participate in forwarding
+  // module requirements.
+  if (this->GeneratorTarget->HaveFortranSources(config) &&
+      !this->Configs[config].ScanningInfo.count("Fortran")) {
+    ScanningFiles files;
+    this->Configs[config].ScanningInfo["Fortran"].emplace_back(files);
+    this->WriteCompileRule("Fortran", config, WithScanning::Yes);
+  }
+
   for (auto const& langScanningFiles : this->Configs[config].ScanningInfo) {
     std::string const& language = langScanningFiles.first;
     std::vector<ScanningFiles> const& scanningFiles = langScanningFiles.second;