Duncan P. N. Exon Smith b5ce11fcc6 Lex: Return "" when HeaderMap::lookupFilename fails ...

Change getString() to return Optional<StringRef>, and change
lookupFilename() to return an empty string if either one of the prefix
and suffix can't be found.

This is a more robust follow-up to r261461, but it's still not entirely
satisfactory.  Ideally we'd report that the header map is corrupt;
perhaps something for a follow-up.

llvm-svn: 261596

2016-02-23 00:48:16 +00:00

8.6 KiB

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