LTO: Don't choke on cc_library without srcs.

--
MOS_MIGRATED_REVID=105204997

1 files changed, 3 insertions, 0 deletions

diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkAction.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkAction.java
index 4d412e983c..36c197bda6 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkAction.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CppLinkAction.java
@@ -642,6 +642,9 @@ public final class CppLinkAction extends AbstractAction {
       // this is O(M*N). If we had a nested set of .o files, we could have O(M + N) instead.
       NestedSetBuilder<Artifact> bitcodeBuilder = NestedSetBuilder.stableOrder();
       for (LibraryToLink lib : uniqueLibraries) {
+        if (!lib.containsObjectFiles()) {
+          continue;
+        }
         for (Artifact a : lib.getObjectFiles()) {
           if (compiled.contains(a)) {
             bitcodeBuilder.add(a);