You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
4.8 KiB
HTML
107 lines
4.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "Funding Free Software", the Front-Cover
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
|
(see below). A copy of the license is included in the section entitled
|
|
"GNU Free Documentation License".
|
|
|
|
(a) The FSF's Front-Cover Text is:
|
|
|
|
A GNU Manual
|
|
|
|
(b) The FSF's Back-Cover Text is:
|
|
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
|
software. Copies published by the Free Software Foundation raise
|
|
funds for GNU development. -->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Standard Libraries (Using the GNU Compiler Collection (GCC))</title>
|
|
|
|
<meta name="description" content="Standard Libraries (Using the GNU Compiler Collection (GCC))">
|
|
<meta name="keywords" content="Standard Libraries (Using the GNU Compiler Collection (GCC))">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Trouble.html#Trouble" rel="up" title="Trouble">
|
|
<link href="Disappointments.html#Disappointments" rel="next" title="Disappointments">
|
|
<link href="Fixed-Headers.html#Fixed-Headers" rel="prev" title="Fixed Headers">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Standard-Libraries"></a>
|
|
<div class="header">
|
|
<p>
|
|
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>
|
|
</div>
|
|
<hr>
|
|
<a name="Standard-Libraries-1"></a>
|
|
<h3 class="section">13.5 Standard Libraries</h3>
|
|
|
|
<a name="index-Wall-1"></a>
|
|
<p>GCC by itself attempts to be a conforming freestanding implementation.
|
|
See <a href="Standards.html#Standards">Language Standards Supported by GCC</a>, for details of
|
|
what this means. Beyond the library facilities required of such an
|
|
implementation, the rest of the C library is supplied by the vendor of
|
|
the operating system. If that C library doesn’t conform to the C
|
|
standards, then your programs might get warnings (especially when using
|
|
<samp>-Wall</samp>) that you don’t expect.
|
|
</p>
|
|
<p>For example, the <code>sprintf</code> function on SunOS 4.1.3 returns
|
|
<code>char *</code> while the C standard says that <code>sprintf</code> returns an
|
|
<code>int</code>. The <code>fixincludes</code> program could make the prototype for
|
|
this function match the Standard, but that would be wrong, since the
|
|
function will still return <code>char *</code>.
|
|
</p>
|
|
<p>If you need a Standard compliant library, then you need to find one, as
|
|
GCC does not provide one. The GNU C library (called <code>glibc</code>)
|
|
provides ISO C, POSIX, BSD, SystemV and X/Open compatibility for
|
|
GNU/Linux and HURD-based GNU systems; no recent version of it supports
|
|
other systems, though some very old versions did. Version 2.2 of the
|
|
GNU C library includes nearly complete C99 support. You could also ask
|
|
your operating system vendor if newer libraries are available.
|
|
</p>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|