aaron.ballman added a comment.

In D144878#4171234 <https://reviews.llvm.org/D144878#4171234>, @karapsinie 
wrote:

> PTAL.

Have you seen the comments on the GCC issue that @MaskRay filed? Is that 
something we should do as well? (It doesn't have to be part of this patch, but 
it'd be good to ensure we're collaborating with GCC so we get the same builtin 
functionality in this space.)

There should be a release note and documentation for the new functionality. One 
thing to consider for the docs is explaining what's going on with text 
encodings (and perhaps that text applies to this entire class of file-related 
builtins). e.g., if the system code page is Shift-JIS does this builtin return 
the text in Shift-JIS or UTF-8 or something else?



================
Comment at: clang/unittests/AST/ASTImporterTest.cpp:1553
         int a = d;
-        union { 
+        union {
           int b;
----------------
You should back out the spurious whitespace changes (I'd recommend setting your 
editor to not discard trailing whitespace on save as that's a common culprit 
for this).


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D144878/new/

https://reviews.llvm.org/D144878

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