1 files changed, 6 insertions, 1 deletions
diff --git a/Source/cmLocalGenerator.cxx b/Source/cmLocalGenerator.cxx
index 5bf9d32..cedb367 100644
--- a/Source/cmLocalGenerator.cxx
+++ b/Source/cmLocalGenerator.cxx
@@ -3377,7 +3377,12 @@ void cmLocalGenerator::AppendDefines(
     if (!this->CheckDefinition(d.Value)) {
       continue;
     }
-    defines.insert(d);
+    // remove any leading -D
+    if (cmHasLiteralPrefix(d.Value, "-D")) {
+      defines.emplace(d.Value.substr(2), d.Backtrace);
+    } else {
+      defines.insert(d);
+    }
   }
 }