108 lines
4.9 KiB
HTML
108 lines
4.9 KiB
HTML
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A GNU Manual
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<head>
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<title>Using the GNU Compiler Collection (GCC): Standard Libraries</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): Standard Libraries">
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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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<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">12.5 Standard Libraries</h3>
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<a name="index-Wall-2"></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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