Modify a comment to reflect changes of r183717.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@183751 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Frontend/ASTUnit.cpp b/lib/Frontend/ASTUnit.cpp
index c72e4eb3c59ccb82f9a2be7488635d4a84f14388..03279ef42fd422989867eeef2001fd2d822bf916 100644 (file)
--- a/lib/Frontend/ASTUnit.cpp
+++ b/lib/Frontend/ASTUnit.cpp
@@ -1634,8 +1634,8 @@ llvm::MemoryBuffer *ASTUnit::getMainBufferWithPrecompiledPreamble(
   Act->EndSourceFile();
 
   if (!Act->hasEmittedPreamblePCH()) {
-    // There were errors parsing the preamble, so no precompiled header was
-    // generated. Forget that we even tried.
+    // The preamble PCH failed (e.g. there was a module loading fatal error),
+    // so no precompiled header was generated. Forget that we even tried.
     // FIXME: Should we leave a note for ourselves to try again?
     llvm::sys::Path(FrontendOpts.OutputFile).eraseFromDisk();
     Preamble.clear();