From: Bill Wendling <isanbard@gmail.com>
Date: Sun, 1 Dec 2013 02:07:35 +0000 (+0000)
Subject: Merging r195877:
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f91fc4bfa3561990bbb39d3ed2045a75cbaa0df4;p=clang

Merging r195877:
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r195877 | llunak | 2013-11-27 13:14:43 -0800 (Wed, 27 Nov 2013) | 3 lines

strip UTF-8 BOM in -frewrite-includes (PR#15664)


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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_34@195987 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Rewrite/Frontend/InclusionRewriter.cpp b/lib/Rewrite/Frontend/InclusionRewriter.cpp
index bd4250adaa..71ceb5f0b6 100644
--- a/lib/Rewrite/Frontend/InclusionRewriter.cpp
+++ b/lib/Rewrite/Frontend/InclusionRewriter.cpp
@@ -367,6 +367,11 @@ bool InclusionRewriter::Process(FileID FileId,
   unsigned NextToWrite = 0;
   int Line = 1; // The current input file line number.
 
+  // Ignore UTF-8 BOM, otherwise it'd end up somewhere else than the start
+  // of the resulting file.
+  if (FromFile.getBuffer().startswith("\xEF\xBB\xBF"))
+    NextToWrite = 3;
+
   Token RawToken;
   RawLex.LexFromRawLexer(RawToken);
 
diff --git a/test/Frontend/Inputs/rewrite-includes-bom.h b/test/Frontend/Inputs/rewrite-includes-bom.h
new file mode 100644
index 0000000000..7ba011fc2d
--- /dev/null
+++ b/test/Frontend/Inputs/rewrite-includes-bom.h
@@ -0,0 +1 @@
+// This file starts with UTF-8 BOM marker.
diff --git a/test/Frontend/rewrite-includes-bom.c b/test/Frontend/rewrite-includes-bom.c
new file mode 100644
index 0000000000..a1aa4c98f8
--- /dev/null
+++ b/test/Frontend/rewrite-includes-bom.c
@@ -0,0 +1,4 @@
+// RUN: %clang -E -frewrite-includes -I %S/Inputs %s -o - | %clang -fsyntax-only -Xclang -verify -x c -
+// expected-no-diagnostics
+
+#include "rewrite-includes-bom.h"