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107 lines
4.8 KiB
HTML
107 lines
4.8 KiB
HTML
4 years ago
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<!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) 1988-2018 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 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Standard Libraries (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="Standard Libraries (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="Standard Libraries (Using the GNU Compiler Collection (GCC))">
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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="Trouble.html#Trouble" rel="up" title="Trouble">
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<link href="Disappointments.html#Disappointments" rel="next" title="Disappointments">
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<link href="Fixed-Headers.html#Fixed-Headers" rel="prev" title="Fixed Headers">
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<style type="text/css">
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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">
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<a name="Standard-Libraries"></a>
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<div class="header">
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<p>
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Next: <a href="Disappointments.html#Disappointments" accesskey="n" rel="next">Disappointments</a>, Previous: <a href="Fixed-Headers.html#Fixed-Headers" accesskey="p" rel="prev">Fixed Headers</a>, Up: <a href="Trouble.html#Trouble" accesskey="u" rel="up">Trouble</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="Standard-Libraries-1"></a>
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<h3 class="section">13.5 Standard Libraries</h3>
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<a name="index-Wall-1"></a>
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<p>GCC by itself attempts to be a conforming freestanding implementation.
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See <a href="Standards.html#Standards">Language Standards Supported by GCC</a>, for details of
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what this means. Beyond the library facilities required of such an
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implementation, the rest of the C library is supplied by the vendor of
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the operating system. If that C library doesn’t conform to the C
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standards, then your programs might get warnings (especially when using
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<samp>-Wall</samp>) that you don’t expect.
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</p>
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<p>For example, the <code>sprintf</code> function on SunOS 4.1.3 returns
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<code>char *</code> while the C standard says that <code>sprintf</code> returns an
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<code>int</code>. The <code>fixincludes</code> program could make the prototype for
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this function match the Standard, but that would be wrong, since the
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function will still return <code>char *</code>.
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</p>
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<p>If you need a Standard compliant library, then you need to find one, as
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GCC does not provide one. The GNU C library (called <code>glibc</code>)
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provides ISO C, POSIX, BSD, SystemV and X/Open compatibility for
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GNU/Linux and HURD-based GNU systems; no recent version of it supports
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other systems, though some very old versions did. Version 2.2 of the
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GNU C library includes nearly complete C99 support. You could also ask
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your operating system vendor if newer libraries are available.
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</p>
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</body>
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</html>
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