183 lines
8.7 KiB
HTML
183 lines
8.7 KiB
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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(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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You have freedom to copy and modify this GNU Manual, like GNU
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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): Characters implementation</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Characters implementation">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): Characters implementation">
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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-Implementation.html#C-Implementation" rel="up" title="C Implementation">
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<link href="Integers-implementation.html#Integers-implementation" rel="next" title="Integers implementation">
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<link href="Identifiers-implementation.html#Identifiers-implementation" rel="prev" title="Identifiers implementation">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Characters-implementation"></a>
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<div class="header">
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<p>
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Next: <a href="Integers-implementation.html#Integers-implementation" accesskey="n" rel="next">Integers implementation</a>, Previous: <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="p" rel="prev">Identifiers implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</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="Characters"></a>
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<h3 class="section">4.4 Characters</h3>
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<ul>
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<li> <cite>The number of bits in a byte (C90 3.4, C99 and C11 3.6).</cite>
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<p>Determined by ABI.
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</p>
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</li><li> <cite>The values of the members of the execution character set (C90,
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C99 and C11 5.2.1).</cite>
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<p>Determined by ABI.
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</p>
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</li><li> <cite>The unique value of the member of the execution character set produced
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for each of the standard alphabetic escape sequences (C90, C99 and C11
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5.2.2).</cite>
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<p>Determined by ABI.
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</p>
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</li><li> <cite>The value of a <code>char</code> object into which has been stored any
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character other than a member of the basic execution character set
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(C90 6.1.2.5, C99 and C11 6.2.5).</cite>
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<p>Determined by ABI.
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</p>
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</li><li> <cite>Which of <code>signed char</code> or <code>unsigned char</code> has the same
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range, representation, and behavior as “plain” <code>char</code> (C90
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6.1.2.5, C90 6.2.1.1, C99 and C11 6.2.5, C99 and C11 6.3.1.1).</cite>
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<a name="index-fsigned_002dchar-1"></a>
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<a name="index-funsigned_002dchar-1"></a>
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<p>Determined by ABI. The options <samp>-funsigned-char</samp> and
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<samp>-fsigned-char</samp> change the default. See <a href="C-Dialect-Options.html#C-Dialect-Options">Options Controlling C Dialect</a>.
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</p>
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</li><li> <cite>The mapping of members of the source character set (in character
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constants and string literals) to members of the execution character
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set (C90 6.1.3.4, C99 and C11 6.4.4.4, C90, C99 and C11 5.1.1.2).</cite>
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<p>Determined by ABI.
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</p>
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</li><li> <cite>The value of an integer character constant containing more than one
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character or containing a character or escape sequence that does not map
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to a single-byte execution character (C90 6.1.3.4, C99 and C11 6.4.4.4).</cite>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>.
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</p>
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</li><li> <cite>The value of a wide character constant containing more than one
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multibyte character or a single multibyte character that maps to
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multiple members of the extended execution character set, or
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containing a multibyte character or escape sequence not represented in
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the extended execution character set (C90 6.1.3.4, C99 and C11
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6.4.4.4).</cite>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>.
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</p>
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</li><li> <cite>The current locale used to convert a wide character constant consisting
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of a single multibyte character that maps to a member of the extended
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execution character set into a corresponding wide character code (C90
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6.1.3.4, C99 and C11 6.4.4.4).</cite>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>.
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</p>
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</li><li> <cite>Whether differently-prefixed wide string literal tokens can be
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concatenated and, if so, the treatment of the resulting multibyte
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character sequence (C11 6.4.5).</cite>
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<p>Such tokens may not be concatenated.
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</p>
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</li><li> <cite>The current locale used to convert a wide string literal into
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corresponding wide character codes (C90 6.1.4, C99 and C11 6.4.5).</cite>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>.
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</p>
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</li><li> <cite>The value of a string literal containing a multibyte character or escape
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sequence not represented in the execution character set (C90 6.1.4,
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C99 and C11 6.4.5).</cite>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>.
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</p>
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</li><li> <cite>The encoding of any of <code>wchar_t</code>, <code>char16_t</code>, and
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<code>char32_t</code> where the corresponding standard encoding macro
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(<code>__STDC_ISO_10646__</code>, <code>__STDC_UTF_16__</code>, or
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<code>__STDC_UTF_32__</code>) is not defined (C11 6.10.8.2).</cite>
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<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
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behavior</a> in <cite>The C Preprocessor</cite>. <code>char16_t</code> and
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<code>char32_t</code> literals are always encoded in UTF-16 and UTF-32
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respectively.
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</p>
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</li></ul>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Integers-implementation.html#Integers-implementation" accesskey="n" rel="next">Integers implementation</a>, Previous: <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="p" rel="prev">Identifiers implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</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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</body>
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</html>
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