1<html lang="en"> 2<head> 3<title>Escaped Newlines - Using the GNU Compiler Collection (GCC)</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Using the GNU Compiler Collection (GCC)"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="C-Extensions.html#C-Extensions" title="C Extensions"> 9<link rel="prev" href="Variadic-Macros.html#Variadic-Macros" title="Variadic Macros"> 10<link rel="next" href="Subscripting.html#Subscripting" title="Subscripting"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<!-- 13Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 141998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 152010 Free Software Foundation, Inc. 16 17Permission is granted to copy, distribute and/or modify this document 18under the terms of the GNU Free Documentation License, Version 1.3 or 19any later version published by the Free Software Foundation; with the 20Invariant Sections being ``Funding Free Software'', the Front-Cover 21Texts being (a) (see below), and with the Back-Cover Texts being (b) 22(see below). A copy of the license is included in the section entitled 23``GNU Free Documentation License''. 24 25(a) The FSF's Front-Cover Text is: 26 27 A GNU Manual 28 29(b) The FSF's Back-Cover Text is: 30 31 You have freedom to copy and modify this GNU Manual, like GNU 32 software. Copies published by the Free Software Foundation raise 33 funds for GNU development.--> 34<meta http-equiv="Content-Style-Type" content="text/css"> 35<style type="text/css"><!-- 36 pre.display { font-family:inherit } 37 pre.format { font-family:inherit } 38 pre.smalldisplay { font-family:inherit; font-size:smaller } 39 pre.smallformat { font-family:inherit; font-size:smaller } 40 pre.smallexample { font-size:smaller } 41 pre.smalllisp { font-size:smaller } 42 span.sc { font-variant:small-caps } 43 span.roman { font-family:serif; font-weight:normal; } 44 span.sansserif { font-family:sans-serif; font-weight:normal; } 45--></style> 46<link rel="stylesheet" type="text/css" href="../cs.css"> 47</head> 48<body> 49<div class="node"> 50<a name="Escaped-Newlines"></a> 51<p> 52Next: <a rel="next" accesskey="n" href="Subscripting.html#Subscripting">Subscripting</a>, 53Previous: <a rel="previous" accesskey="p" href="Variadic-Macros.html#Variadic-Macros">Variadic Macros</a>, 54Up: <a rel="up" accesskey="u" href="C-Extensions.html#C-Extensions">C Extensions</a> 55<hr> 56</div> 57 58<h3 class="section">6.21 Slightly Looser Rules for Escaped Newlines</h3> 59 60<p><a name="index-escaped-newlines-2362"></a><a name="index-newlines-_0028escaped_0029-2363"></a> 61Recently, the preprocessor has relaxed its treatment of escaped 62newlines. Previously, the newline had to immediately follow a 63backslash. The current implementation allows whitespace in the form 64of spaces, horizontal and vertical tabs, and form feeds between the 65backslash and the subsequent newline. The preprocessor issues a 66warning, but treats it as a valid escaped newline and combines the two 67lines to form a single logical line. This works within comments and 68tokens, as well as between tokens. Comments are <em>not</em> treated as 69whitespace for the purposes of this relaxation, since they have not 70yet been replaced with spaces. 71 72 </body></html> 73 74