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-rw-r--r--lib/Lex/Lexer.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/Lex/Lexer.cpp b/lib/Lex/Lexer.cpp
index e930f3def2..63bf58a12c 100644
--- a/lib/Lex/Lexer.cpp
+++ b/lib/Lex/Lexer.cpp
@@ -113,6 +113,8 @@ Lexer::Lexer(SourceLocation fileloc, const LangOptions &features,
Is_PragmaLexer = false;
InitCharacterInfo();
+ // If a MemoryBuffer was specified, use its start as BufferStart. This affects
+ // the source location objects produced by this lexer.
BufferStart = FromFile ? FromFile->getBufferStart() : BufStart;
BufferPtr = BufStart;
BufferEnd = BufEnd;