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add section about using ccache
== Compiling using 2 or more CPU cores ==
== Compiling using 2 or more CPU cores ==
Before running <code>./sugar-jhbuild build</code>, append this to sugar.jhbuildrc:
Before running <code>./sugar-jhbuild build</code>, append this to <code>sugar.jhbuildrc</code>:
<pre>
<pre>
Adjust the numbers to be twice the number of CPU cores in your machine.
Adjust the numbers to be twice the number of CPU cores in your machine.
== Using ccache to speed up rebuilds ==
To speed up full rebuilds of sugar-jhbuild (i.e. running <code>./sugar-jhbuild build</code> after removing the <code>source</code> directory) you can use [http://ccache.samba.org/ ccache]. Install it and append the following to <code>sugar.jhbuildrc</code>:
<pre>
os.environ["CCACHE_DIR"] = os.path.join(os.path.dirname(__file__), "ccache")
os.environ["PATH"] = "/usr/lib/ccache:"+os.environ["PATH"]
</pre>
Adjust <code>/usr/lib/ccache</code> to the path used by your distribution and create the <code>ccache</code> directory (inside your <code>sugar-jhbuild</code> checkout).
==Useful Internal Links==
==Useful Internal Links==