kumquat-buildroot/docs/manual/ccache-support.txt
Thomas De Schampheleire 569db40574 manual: high-level restructuring
The structure of the buildroot manual is not always clear. There is a large
number of chapters, and some chapters seem to overlap. The distinction
between general usage and developer information is not always clear.

This patch restructures the manual into four large parts:
- getting started
- user guide
- developer guide
- appendix

Except for the names of these parts, the section names are not yet changed.
Content-wise there are no changes yet either. This will be handled in
subsequent patches.

In order to achieve the introduction of a new level 'parts' above
'chapters', the section indicators (=, ==, ===, ...) of several sections
have to be moved one level down. Additionally, the leveloffset indication to
asciidoc has to be removed. Finally, to maintain more or less the same level
of detail in the table of contents, the toc.section.depth attribute is
reduced as well. Note that for some sections, less detail is visible now.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
2014-08-17 21:09:52 +02:00

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// -*- mode:doc; -*-
// vim: set syntax=asciidoc:
[[ccache]]
==== Using +ccache+ in Buildroot
http://ccache.samba.org[ccache] 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.
+ccache+ support is integrated in Buildroot. You just have to enable
+Enable compiler cache+ in +Build options+. This will automatically
build +ccache+ and use it for every host and target compilation.
The cache is located in +$HOME/.buildroot-ccache+. 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.
You can get statistics on the cache (its size, number of hits,
misses, etc.) by running +make ccache-stats+.
The make target +ccache-options+ and the +CCACHE_OPTIONS+ variable
provide more generic access to the ccache. For example
-----------------
# set cache limit size
make CCACHE_OPTIONS="--max-size=5G" ccache-options
# zero statistics counters
make CCACHE_OPTIONS="--zero-stats" ccache-options
-----------------