tejohnson added inline comments.

================
Comment at: lib/CodeGen/BackendUtil.cpp:65
+        "Ignore an empty index file and perform non-ThinLTO compilation"),
+    llvm::cl::init(false));
+
----------------
mehdi_amini wrote:
> Is it common to do this in clang?
Doesn't look common, but I see one other LLVM internal option (in 
CodeGenPGO.cpp), and a few other uses in tests. Is there a better way to do 
internal options in clang?


https://reviews.llvm.org/D28362



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