3 files changed, 10 insertions, 1 deletions
diff --git a/clang/lib/Format/ContinuationIndenter.cpp b/clang/lib/Format/ContinuationIndenter.cpp
index d4bf6ecfa91..872545660ca 100644
--- a/clang/lib/Format/ContinuationIndenter.cpp
+++ b/clang/lib/Format/ContinuationIndenter.cpp
@@ -63,7 +63,8 @@ ContinuationIndenter::ContinuationIndenter(const FormatStyle &Style,
                                            bool BinPackInconclusiveFunctions)
     : Style(Style), SourceMgr(SourceMgr), Whitespaces(Whitespaces),
       Encoding(Encoding),
-      BinPackInconclusiveFunctions(BinPackInconclusiveFunctions) {}
+      BinPackInconclusiveFunctions(BinPackInconclusiveFunctions),
+      CommentPragmasRegex(Style.CommentPragmas) {}
 
 LineState ContinuationIndenter::getInitialState(unsigned FirstIndent,
                                                 const AnnotatedLine *Line,
@@ -810,12 +811,16 @@ unsigned ContinuationIndenter::breakProtrudingToken(const FormatToken &Current,
       return 0;
     }
   } else if (Current.Type == TT_BlockComment && Current.isTrailingComment()) {
+    if (CommentPragmasRegex.match(Current.TokenText.substr(2)))
+      return 0;
     Token.reset(new BreakableBlockComment(
         Current, State.Line->Level, StartColumn, Current.OriginalColumn,
         !Current.Previous, State.Line->InPPDirective, Encoding, Style));
   } else if (Current.Type == TT_LineComment &&
              (Current.Previous == NULL ||
               Current.Previous->Type != TT_ImplicitStringLiteral)) {
+    if (CommentPragmasRegex.match(Current.TokenText.substr(2)))
+      return 0;
     Token.reset(new BreakableLineComment(Current, State.Line->Level,
                                          StartColumn, /*InPPDirective=*/false,
                                          Encoding, Style));
diff --git a/clang/lib/Format/ContinuationIndenter.h b/clang/lib/Format/ContinuationIndenter.h
index 41f3f4b8808..2b33f5b0fd2 100644
--- a/clang/lib/Format/ContinuationIndenter.h
+++ b/clang/lib/Format/ContinuationIndenter.h
@@ -18,6 +18,7 @@
 
 #include "Encoding.h"
 #include "clang/Format/Format.h"
+#include "llvm/Support/Regex.h"
 
 namespace clang {
 class SourceManager;
@@ -122,6 +123,7 @@ private:
   WhitespaceManager &Whitespaces;
   encoding::Encoding Encoding;
   bool BinPackInconclusiveFunctions;
+  llvm::Regex CommentPragmasRegex;
 };
 
 struct ParenState {
diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
index 7eb7a2c9c88..2d03a30b25b 100644
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -193,6 +193,7 @@ template <> struct MappingTraits<FormatStyle> {
     IO.mapOptional("SpaceBeforeAssignmentOperators",
                    Style.SpaceBeforeAssignmentOperators);
     IO.mapOptional("ContinuationIndentWidth", Style.ContinuationIndentWidth);
+    IO.mapOptional("CommentPragmas", Style.CommentPragmas);
 
     // For backward compatibility.
     if (!IO.outputting()) {
@@ -275,6 +276,7 @@ FormatStyle getLLVMStyle() {
   LLVMStyle.SpaceBeforeAssignmentOperators = true;
   LLVMStyle.ContinuationIndentWidth = 4;
   LLVMStyle.SpacesInAngles = false;
+  LLVMStyle.CommentPragmas = "^ IWYU pragma:";
 
   LLVMStyle.PenaltyBreakComment = 300;
   LLVMStyle.PenaltyBreakFirstLessLess = 120;