rsmith added inline comments.
================
Comment at: lib/Frontend/CompilerInstance.cpp:1503
@@ +1502,3 @@
+ if (!Module || !Module->getASTFile() ||
+ std::string(Module->getASTFile()->getName()) != ModuleFileName) {
+ // Error out if Module does not refer to the file in the prebuilt
----------------
It'd be safer to check that `FileMgr.getFile(ModuleFileName) ==
Module->getASTFile()` in case the filename gets canonicalized by the file
manager in some way.
https://reviews.llvm.org/D23125
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