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72 lines
3.1 KiB
HTML
72 lines
3.1 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>Escaped Newlines - Using the GNU Compiler Collection (GCC)</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="C-Extensions.html#C-Extensions" title="C Extensions">
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<link rel="prev" href="Variadic-Macros.html#Variadic-Macros" title="Variadic Macros">
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<link rel="next" href="Subscripting.html#Subscripting" title="Subscripting">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1988-2015 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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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Escaped-Newlines"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Subscripting.html#Subscripting">Subscripting</a>,
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Previous: <a rel="previous" accesskey="p" href="Variadic-Macros.html#Variadic-Macros">Variadic Macros</a>,
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Up: <a rel="up" accesskey="u" href="C-Extensions.html#C-Extensions">C Extensions</a>
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<hr>
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</div>
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<h3 class="section">6.21 Slightly Looser Rules for Escaped Newlines</h3>
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<p><a name="index-escaped-newlines-3002"></a><a name="index-newlines-_0028escaped_0029-3003"></a>
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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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</body></html>
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