From 363300ace5e2cf63835d5797be951dbc95b3f55e Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Tue, 13 Feb 2024 14:32:34 -0500
Subject: cxxmodules: depend on the modmap contents

If the modmap changes, we need to recompile. It is not just a file that
needs to exist to compile.

Fixes: #25511
---
 Source/cmNinjaTargetGenerator.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Source/cmNinjaTargetGenerator.cxx b/Source/cmNinjaTargetGenerator.cxx
index 1d90194..99aa7f2 100644
--- a/Source/cmNinjaTargetGenerator.cxx
+++ b/Source/cmNinjaTargetGenerator.cxx
@@ -1600,7 +1600,7 @@ void cmNinjaTargetGenerator::WriteObjectBuildStatement(
       // corresponding file path.
       std::string ddModmapFile = cmStrCat(objectFileName, ".modmap");
       vars["DYNDEP_MODULE_MAP_FILE"] = ddModmapFile;
-      objBuild.OrderOnlyDeps.push_back(ddModmapFile);
+      objBuild.ImplicitDeps.push_back(ddModmapFile);
       scanningFiles.ModuleMapFile = std::move(ddModmapFile);
     }
 
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