1 files changed, 6 insertions, 0 deletions
diff --git a/Source/cmGlobalNinjaGenerator.cxx b/Source/cmGlobalNinjaGenerator.cxx
index d643f05..0c80910 100644
--- a/Source/cmGlobalNinjaGenerator.cxx
+++ b/Source/cmGlobalNinjaGenerator.cxx
@@ -1110,6 +1110,12 @@ void cmGlobalNinjaGenerator::WriteTargetAliases(std::ostream& os)
       continue;
     }
 
+    // Don't write alias if there is a already a custom command with
+    // matching output
+    if (this->HasCustomCommandOutput(ta.first)) {
+      continue;
+    }
+
     cmNinjaDeps deps;
     this->AppendTargetOutputs(ta.second, deps);