Yes, this makes sense to me -- so if people split their preprocessing and
compilation steps (say, for a ccache build), they'll only get the errors from
the second stage.
================
Comment at: lib/Lex/Lexer.cpp:2836
@@ -2836,1 +2835,3 @@
+ if (!isASCII(*BufferPtr) && !isAllowedIDChar(C) &&
+ (isLexingRawMode() || !PP->isPreprocessedOutput())) {
// Non-ASCII characters tend to creep into source code unintentionally.
----------------
Do you need the isLexingRawMode() check here? I guess it doesn't matter if we
drop the non-ASCII characters in that case?
http://llvm-reviews.chandlerc.com/D346
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