Fix PR1969. stdin has no FileEntry.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@46629 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/Lex/HeaderSearch.cpp b/Lex/HeaderSearch.cpp
index e4f7aeb..bd36f35 100644
--- a/Lex/HeaderSearch.cpp
+++ b/Lex/HeaderSearch.cpp
@@ -293,6 +293,8 @@
LookupSubframeworkHeader(const char *FilenameStart,
const char *FilenameEnd,
const FileEntry *ContextFileEnt) {
+ assert(ContextFileEnt && "No context file?");
+
// Framework names must have a '/' in the filename. Find it.
const char *SlashPos = std::find(FilenameStart, FilenameEnd, '/');
if (SlashPos == FilenameEnd) return 0;