From 35b82d26e5b92ba0471f59f0073590de3550f00a Mon Sep 17 00:00:00 2001
From: Nathan Sidwell <nathan@acm.org>
Date: Tue, 10 Oct 2017 18:56:31 +0000
Subject: [PATCH] preprocessor stringizing raw strings

https://gcc.gnu.org/ml/gcc-patches/2017-10/msg00611.html
	libcpp/
	PR preprocessor/82506
	* macro.c (cpp_quote_string): Escape raw LFs.

	gcc/testsuite/
	PR preprocessor/82506
	* g++.dg/cpp/string-3.C: New.

From-SVN: r253605
---
 libcpp/macro.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'libcpp/macro.c')

diff --git a/libcpp/macro.c b/libcpp/macro.c
index de18c22..fab1cb0 100644
--- a/libcpp/macro.c
+++ b/libcpp/macro.c
@@ -502,13 +502,21 @@ cpp_quote_string (uchar *dest, const uchar *src, unsigned int len)
     {
       uchar c = *src++;
 
-      if (c == '\\' || c == '"')
+      switch (c)
 	{
+	case '\n':
+	  /* Naked LF can appear in raw string literals  */
+	  c = 'n';
+	  /* FALLTHROUGH */
+
+	case '\\':
+	case '"':
 	  *dest++ = '\\';
+	  /* FALLTHROUGH */
+
+	default:
 	  *dest++ = c;
 	}
-      else
-	  *dest++ = c;
     }
 
   return dest;
-- 
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