99 lines
4.3 KiB
HTML
99 lines
4.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): Escaped Newlines</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Escaped Newlines">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Escaped Newlines">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">
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<link href="Subscripting.html#Subscripting" rel="next" title="Subscripting">
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<link href="Variadic-Macros.html#Variadic-Macros" rel="prev" title="Variadic Macros">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style:oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Escaped-Newlines"></a>
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<div class="header">
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<p>
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Next: <a href="Subscripting.html#Subscripting" accesskey="n" rel="next">Subscripting</a>, Previous: <a href="Variadic-Macros.html#Variadic-Macros" accesskey="p" rel="prev">Variadic Macros</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Slightly-Looser-Rules-for-Escaped-Newlines"></a>
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<h3 class="section">6.21 Slightly Looser Rules for Escaped Newlines</h3>
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<a name="index-escaped-newlines"></a>
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<a name="index-newlines-_0028escaped_0029"></a>
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<p>The preprocessor treatment of escaped newlines is more relaxed
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than that specified by the C90 standard, which requires the newline
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to immediately follow a backslash.
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GCC’s implementation allows whitespace in the form
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of spaces, horizontal and vertical tabs, and form feeds between the
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backslash and the subsequent newline. The preprocessor issues a
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warning, but treats it as a valid escaped newline and combines the two
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lines to form a single logical line. This works within comments and
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tokens, as well as between tokens. Comments are <em>not</em> treated as
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whitespace for the purposes of this relaxation, since they have not
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yet been replaced with spaces.
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</p>
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</body>
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</html>
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