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ccache: rework ccache management

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* ccache is now a normal package (both for the host and the target).

 * ccache option is now part of the "Build options" menu. It will
   automatically build ccache for the host before building anything,
   and will use it to cache builds for both host compilations and
   target compilations.

 * bump ccache to 3.1.3

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
This commit is contained in:
Thomas Petazzoni
2010-12-07 21:09:56 +01:00
committed by Peter Korsgaard
parent 3bbf1c2ea6
commit 17b66affdf
17 changed files with 113 additions and 242 deletions
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31
docs/buildroot.html
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@@ -29,6 +29,7 @@
<li><a href="#buildroot_innards">How Buildroot works</a></li>
<li><a href="#using_toolchain">Using the uClibc toolchain outside Buildroot</a></li>
<li><a href="#external_toolchain">Use an external toolchain</a></li>
<li><a href="#ccache-support">Using <code>ccache</code> in Buildroot</li>
<li><a href="#downloaded_packages">Location of downloaded packages</a></li>
<li><a href="#add_packages">Adding new packages to Buildroot</a></li>
<li><a href="#board_support">Creating your own board support</a></li>
@@ -523,9 +524,8 @@ $(ZLIB_DIR)/libz.a: $(ZLIB_DIR)/.configured
<ul>
<li><b>toolchain</b> (in the <code>toolchain/</code> directory) contains
the Makefiles and associated files for all software related to the
cross-compilation toolchain: <code>binutils</code>, <code>ccache</code>,
<code>gcc</code>, <code>gdb</code>, <code>kernel-headers</code> and
<code>uClibc</code>.</li>
cross-compilation toolchain: <code>binutils</code>, <code>gcc</code>,
<code>gdb</code>, <code>kernel-headers</code> and <code>uClibc</code>.</li>
<li><b>package</b> (in the <code>package/</code> directory) contains the
Makefiles and associated files for all user-space tools that Buildroot
@@ -681,6 +681,31 @@ endif
Build options -&gt; Toolchain and header file location</code> options.
This could be useful if the toolchain must be shared with other users.</p>
<h2 id="ccache-support">Using <code>ccache</code> in Buildroot</h2>
<p><a href="http://ccache.samba.org">ccache</a> is a compiler
cache. It stores the object files resulting from each compilation
process, and is able to skip future compilation of the same source
file (with same compiler and same arguments) by using the
pre-existing object files. When doing almost identical builds from
scratch a number of times, it can nicely speed up the build
process.</p>
<p><code>ccache</code> support is integrated in Buildroot. You
just have to enable <code>Enable compiler cache</code>
in <code>Build options</code>. This will automatically build
<code>ccache</code> and use it for every host and target
compilation.</p>
<p>The cache is located
in <code>$HOME/.buildroot-ccache</code>. It is stored outside of
Buildroot output directory so that it can be shared by separate
Buildroot builds. If you want to get rid of the cache, simply
remove this directory.</p>
<p>You can get statistics on the cache (its size, number of hits,
misses, etc.) by running <code>make ccache-stats</code>.</p>
<h2 id="downloaded_packages">Location of downloaded packages</h2>
<p>It might be useful to know that the various tarballs that are