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-rw-r--r--lib/Frontend/CompilerInstance.cpp7
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/Frontend/CompilerInstance.cpp b/lib/Frontend/CompilerInstance.cpp
index b5feadb96d..30c3b62c19 100644
--- a/lib/Frontend/CompilerInstance.cpp
+++ b/lib/Frontend/CompilerInstance.cpp
@@ -474,8 +474,11 @@ bool CompilerInstance::InitializeSourceManager(llvm::StringRef InputFile,
FileManager &FileMgr,
SourceManager &SourceMgr,
const FrontendOptions &Opts) {
- // Figure out where to get and map in the main file.
- if (InputFile != "-") {
+ // Figure out where to get and map in the main file, unless it's already
+ // been created (e.g., by a precompiled preamble).
+ if (!SourceMgr.getMainFileID().isInvalid()) {
+ // Do nothing: the main file has already been set.
+ } else if (InputFile != "-") {
const FileEntry *File = FileMgr.getFile(InputFile);
if (!File) {
Diags.Report(diag::err_fe_error_reading) << InputFile;