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| <a name="Standard-Libraries-1"></a> |
| <h3 class="section">11.5 Standard Libraries</h3> |
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| <a name="index-Wall-2"></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. |
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