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pkg-autotools: use --disable-dependency-tracking

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By default, automake does "dependency tracking", which allows the
generated Makefile to contain the necessary dependencies to
automatically rebuild the appropriate C files when included header
files are changed. This dependency tracking is nice when doing active
development on the package, but not really useful when doing a
one-time build of the package. According to automake's
documentation[1], disabling the dependency tracking provides a small
speed-up.

In some very unscientific measurements (i.e repeated only once), we
have noticed a ~3.6% reduction of the total build time of a Buildroot
toolchain after applying this patch.

[1] http://www.gnu.org/software/automake/manual/html_node/Dependency-Tracking.html

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni 2014-08-28 23:03:44 +02:00 committed by Peter Korsgaard
parent 49e36dcf13
commit 3e37b0fc6c
1 changed files with 2 additions and 0 deletions
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2
package/pkg-autotools.mk
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@ -140,6 +140,7 @@ define $(2)_CONFIGURE_CMDS
--disable-documentation \
--with-xmlto=no \
--with-fop=no \
--disable-dependency-tracking \
$$(DISABLE_NLS) \
$$(DISABLE_LARGEFILE) \
$$(DISABLE_IPV6) \
@ -169,6 +170,7 @@ define $(2)_CONFIGURE_CMDS
--disable-documentation \
--with-xmlto=no \
--with-fop=no \
--disable-dependency-tracking \
$$(QUIET) $$($$(PKG)_CONF_OPT) \
)
endef