Regards, Petteri -- Gentoo/Java project lead
ccache looks at gcc command line and bases the cache on that so we need to keep it static. See HOW IT WORKS in http://ccache.samba.org/ccache-man.html
Index: README-builds.html
===================================================================
--- README-builds.html (revision 237)
+++ README-builds.html (working copy)
@@ -1367,7 +1367,10 @@
and the rest of the JDK will often be disk intensive.
<p>
Faster compiles are possible using a tool called
- <a href="http://ccache.samba.org/";>ccache</a>.
+ <a href="http://ccache.samba.org/";>ccache</a>. To be effectively able to
+ use ccache set the BUILD_NUMBER environment variable. It by default has the
+ value of the current date which invalidates the ccache.
+ </p>
</blockquote>
</li>
<li>
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