1 files changed, 5 insertions, 1 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcCompilationOutputs.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcCompilationOutputs.java
index b7f0300adb..d0cd8dfece 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcCompilationOutputs.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcCompilationOutputs.java
@@ -20,7 +20,7 @@ import com.google.devtools.build.lib.actions.Artifact;
 import com.google.devtools.build.lib.collect.nestedset.NestedSet;
 import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
 import com.google.devtools.build.lib.collect.nestedset.Order;
-
+import com.google.devtools.build.lib.util.Preconditions;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
@@ -200,11 +200,15 @@ public class CcCompilationOutputs {
      * Adds an .o file.
      */
     public Builder addObjectFile(Artifact artifact) {
+      Preconditions.checkArgument(Link.OBJECT_FILETYPES.matches(artifact.getFilename()));
       objectFiles.add(artifact);
       return this;
     }
 
     public Builder addObjectFiles(Iterable<Artifact> artifacts) {
+      for (Artifact artifact : artifacts) {
+        Preconditions.checkArgument(Link.OBJECT_FILETYPES.matches(artifact.getFilename()));
+      }
       Iterables.addAll(objectFiles, artifacts);
       return this;
     }