[clang-scan-deps] Skip UTF-8 BOM in source minimizer

Differential Revision: https://reviews.llvm.org/D66511

llvm-svn: 369993

1 files changed, 7 insertions, 0 deletions

diff --git a/clang/lib/Lex/DependencyDirectivesSourceMinimizer.cpp b/clang/lib/Lex/DependencyDirectivesSourceMinimizer.cpp
index 265a6e44e33..a350481df9a 100644
--- a/clang/lib/Lex/DependencyDirectivesSourceMinimizer.cpp
+++ b/clang/lib/Lex/DependencyDirectivesSourceMinimizer.cpp
@@ -834,7 +834,14 @@ bool Minimizer::lexPPLine(const char *&First, const char *const End) {
   return lexDefault(Kind, Id.Name, First, End);
 }
 
+static void skipUTF8ByteOrderMark(const char *&First, const char *const End) {
+  if ((End - First) >= 3 && First[0] == '\xef' && First[1] == '\xbb' &&
+      First[2] == '\xbf')
+    First += 3;
+}
+
 bool Minimizer::minimizeImpl(const char *First, const char *const End) {
+  skipUTF8ByteOrderMark(First, End);
   while (First != End)
     if (lexPPLine(First, End))
       return true;