[PCH] When writing out the list of input files, avoid emitting duplicate

entries of the same file.

This can happen because the file was "included" multiple times and is
referenced by multiple SLocEntries.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169829 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index ff98d9beb054fa0c966054918e7193d211b30f0c..ed0a272faa0acd70a61b808e56867f211f9b6330 100644 (file)
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -1235,9 +1235,14 @@ void ASTWriter::WriteInputFiles(SourceManager &SourceMgr, StringRef isysroot) {
     if (!Cache->OrigEntry)
       continue;
 
+    uint32_t &InputFileID = InputFileIDs[Cache->OrigEntry];
+    if (InputFileID != 0)
+      continue; // already recorded this file.
+
     // Record this entry's offset.
     InputFileOffsets.push_back(Stream.GetCurrentBitNo());
-    InputFileIDs[Cache->OrigEntry] = InputFileOffsets.size();
+
+    InputFileID = InputFileOffsets.size();
 
     Record.clear();
     Record.push_back(INPUT_FILE);