| <html lang="en"> |
| <head> |
| <title>Standard Libraries - Using the GNU Compiler Collection (GCC)</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using the GNU Compiler Collection (GCC)"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Trouble.html#Trouble" title="Trouble"> |
| <link rel="prev" href="Fixed-Headers.html#Fixed-Headers" title="Fixed Headers"> |
| <link rel="next" href="Disappointments.html#Disappointments" title="Disappointments"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
| 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
| 2008 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 1.2 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.--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Standard-Libraries"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="Disappointments.html#Disappointments">Disappointments</a>, |
| Previous: <a rel="previous" accesskey="p" href="Fixed-Headers.html#Fixed-Headers">Fixed Headers</a>, |
| Up: <a rel="up" accesskey="u" href="Trouble.html#Trouble">Trouble</a> |
| <hr> |
| </div> |
| |
| <h3 class="section">11.6 Standard Libraries</h3> |
| |
| <p><a name="index-Wall-3225"></a>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><span class="option">-Wall</span></samp>) that you don't expect. |
| |
| <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>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. |
| |
| </body></html> |
| |