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ccache: support changing the output directory

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When building in a different output directory than the original build,
there will currently be a lot of ccache misses because in many cases
there is some -I/... absolute path in the compilation. Ccache has an
option CCACHE_BASEDIR to substitute absolute paths with relative paths,
so they wil be the same in the hash (and in the output).

Since there are some disadvantages to this path rewriting, it is made
optional as BR2_CCACHE_USE_BASEDIR. It defaults to y because the
usefulness of ccache is severely reduced without this option.

In addition to CCACHE_BASEDIR, we also substitute away the occurences
of $(HOST_DIR) in the calculation of the compiler hash. This is done
regardless of the setting of BR2_CCACHE_USE_BASEDIR because it's
quite harmless.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Arnout Vandecappelle
2015-10-04 16:25:32 +01:00
committed by Peter Korsgaard
parent f4682cf933
commit 1e97b27873
5 changed files with 65 additions and 1 deletions
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27
Config.in
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@@ -286,6 +286,33 @@ config BR2_CCACHE_INITIAL_SETUP
These initial settings are applied after ccache has been compiled.
config BR2_CCACHE_USE_BASEDIR
bool "Use relative paths"
default y
help
Allow ccache to convert absolute paths within the output
directory into relative paths.
During the build, many -I include directives are given with
an absolute path. These absolute paths end up in the hashes
that are computed by ccache. Therefore, when you build from a
different directory, the hash will be different and the
cached object will not be used.
To improve cache performance, set this option to y. This
allows ccache to rewrite absolute paths within the output
directory into relative paths. Note that only paths within
the output directory will be rewritten; therefore, if you
change BR2_HOST_DIR to point outside the output directory and
subsequently move it to a different location, this will lead
to cache misses.
This option has as a result that the debug information in the
object files also has only relative paths. Therefore, make
sure you cd to the build directory before starting gdb. See
the section "COMPILING IN DIFFERENT DIRECTORIES" in the
ccache manual for more information.
endif
config BR2_DEPRECATED