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Next: <a href="Tools-for-porting.html#Tools-for-porting" accesskey="n" rel="next">Tools for porting</a>, Previous: <a href="Is-it-easy-to-port-OPENSTEP-programs-to-GNUstep_003f.html#Is-it-easy-to-port-OPENSTEP-programs-to-GNUstep_003f" accesskey="p" rel="prev">Is it easy to port OPENSTEP programs to GNUstep?</a>, Up: <a href="Compatibility.html#Compatibility" accesskey="u" rel="up">Compatibility</a> &nbsp; </p>
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<h4 class="subsection">1.1.2 How about porting between Cocoa and GNUstep?</h4>

<p>It&rsquo;s easier from GNUstep to Cocoa than Cocoa to GNUstep. Cocoa is
constantly changing, much faster than GNUstep could hope to keep
up. They have added extensions and new classes that aren&rsquo;t available in
GNUstep yet. Plus there are some other issues. If you start with
Cocoa:
</p>
<ul>
<li> Use #ifndef GNUSTEP for Apple only code.
</li><li> Do not use CoreFoundation
</li><li> Do not use Objective-C++ (except with gcc 4.1 or later)
</li><li> Do not use Quicktime or other proprietary extension
</li><li> GNUstep should be able to read Cocoa nib files automatically, so there
is no need to port these, although you might want to have GNUstep specific
versions of them anyway.
</li></ul>

<p>See also <a href="http://mediawiki.gnustep.org/index.php/Writing_portable_code">http://mediawiki.gnustep.org/index.php/Writing_portable_code</a>
for more information.
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