Quick fix for layering that broke shared library build.

llvm-svn: 207011

1 files changed, 26 insertions, 0 deletions

diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index 79b96ab6890..b74c288cdaa 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -1466,3 +1466,29 @@ GlobalModuleIndex *CompilerInstance::loadGlobalModuleIndex(
   }
   return GlobalIndex;
 }
+
+// Check global module index for missing imports.
+bool
+CompilerInstance::lookupMissingImports(StringRef Name,
+                                       SourceLocation TriggerLoc) {
+  // Look for the symbol in non-imported modules, but only if an error
+  // actually occurred.
+  if (!buildingModule()) {
+    // Load global module index, or retrieve a previously loaded one.
+    GlobalModuleIndex *GlobalIndex = loadGlobalModuleIndex(
+      TriggerLoc);
+
+    // Only if we have a global index.
+    if (GlobalIndex) {
+      GlobalModuleIndex::HitSet FoundModules;
+
+      // Find the modules that reference the identifier.
+      // Note that this only finds top-level modules.
+      // We'll let diagnoseTypo find the actual declaration module.
+      if (GlobalIndex->lookupIdentifier(Name, FoundModules))
+        return true;
+    }
+  }
+
+  return false;
+}