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<html lang="en"><head><title>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 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>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 }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="Standard%20Libraries">Standard Libraries</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Disappointments.html#Disappointments">Disappointments</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Fixed-Headers.html#Fixed%20Headers">Fixed Headers</a>,Up:&nbsp;<a rel="up" accesskey="u" href="Trouble.html#Trouble">Trouble</a><hr><br></div><h3 class="section">Standard Libraries</h3><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 ofwhat this means.  Beyond the library facilities required of such animplementation, the rest of the C library is supplied by the vendor ofthe operating system.  If that C library doesn't conform to the Cstandards, then your programs might get warnings (especially when using<code>-Wall</code>) 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 forthis function match the Standard, but that would be wrong, since thefunction will still return <code>char *</code>.   <p>If you need a Standard compliant library, then you need to find one, asGCC does not provide one.  The GNU C library (called <code>glibc</code>)provides ISO C, POSIX, BSD, SystemV and X/Open compatibility forGNU/Linux and HURD-based GNU systems; no recent version of it supportsother systems, though some very old versions did.  Version 2.2 of theGNU C library includes nearly complete C99 support.  You could also askyour operating system vendor if newer libraries are available.   </body></html>
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