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Author SHA1 Message Date

Author	SHA1	Message	Date
Richard Fuchs	838edc112c	MT#55283 fix kernel version generating booboo Also make shellcheck happy. Change-Id: Ic8a7bd67866ef2c75dec40dbe4207fc92ef31ed2 (cherry picked from commit `277bd13d97`)	8 months ago
Guillem Jover	358c3965a6	MT#61993 build: Rework to use a config.mk generated during the build These are potentially computed from inside each subdir, and in addition due to what appears to be a regression in GNU make 4.4, where it is reevaluating variables that contain $(shell) functions, many times (in the order of thousands, this was slowing down the build, were on the Debian amd64 build daemons it went from 5m with GNU make 4.3 to 2h40m with GNU make 4.4. Although the bulk of the slow down has been fixed with previous commits, the remaining optimizations are only to avoid this potentially happening again in the future, and to reduce useless duplicate work. Instead of trying to cache the values from within make itself, where programming this there is extremely painful, and does not seem to be able to greatly reduce the number of calls, because the build system is going to be called multiple times for different targets. Simply externalize the generation into several shell scripts, that we call to generate a make fragment that then we include from the various Makefiles. For a Debian build with GNU make 4.3, this reduces the amount of total pkg-config calls from around ~1600 to 128, for dpkg-buildflags from ~1100 down to 6, and for dpkg-parsechangelog from ~56 to 17, but the slow down is not as significant there anyway. For a Debian build with GNU make 4.4, this reduces the amount of total pkg-config calls from around ~2600 to 128, for dpkg-buildflags from ~2800 down to 6, and for dpkg-parsechangelog from ~350 to 21. For a Debian build with GNU make 4.4, this reduces the build time on this system from 2m10s to ~ 1m30s. Change-Id: I427d0ea5106dc6ed1ff9e664ccdba2fa0725b7d0 (cherry picked from commit `7dbe24e4e5`)	12 months ago

Richard Fuchs

838edc112c

MT#55283 fix kernel version generating booboo

Also make shellcheck happy.

Change-Id: Ic8a7bd67866ef2c75dec40dbe4207fc92ef31ed2
(cherry picked from commit 277bd13d97)

8 months ago

Guillem Jover

358c3965a6

MT#61993 build: Rework to use a config.mk generated during the build

These are potentially computed from inside each subdir, and in addition
due to what appears to be a regression in GNU make 4.4, where it is
reevaluating variables that contain $(shell) functions, many times (in
the order of thousands, this was slowing down the build, were on the
Debian amd64 build daemons it went from 5m with GNU make 4.3 to 2h40m
with GNU make 4.4. Although the bulk of the slow down has been fixed
with previous commits, the remaining optimizations are only to avoid
this potentially happening again in the future, and to reduce useless
duplicate work.

Instead of trying to cache the values from within make itself, where
programming this there is extremely painful, and does not seem to be
able to greatly reduce the number of calls, because the build system
is going to be called multiple times for different targets. Simply
externalize the generation into several shell scripts, that we call
to generate a make fragment that then we include from the various
Makefiles.

For a Debian build with GNU make 4.3, this reduces the amount of total
pkg-config calls from around ~1600 to 128, for dpkg-buildflags from
~1100 down to 6, and for dpkg-parsechangelog from ~56 to 17, but the
slow down is not as significant there anyway.

For a Debian build with GNU make 4.4, this reduces the amount of total
pkg-config calls from around ~2600 to 128, for dpkg-buildflags from
~2800 down to 6, and for dpkg-parsechangelog from ~350 to 21.

For a Debian build with GNU make 4.4, this reduces the build time
on this system from 2m10s to ~ 1m30s.

Change-Id: I427d0ea5106dc6ed1ff9e664ccdba2fa0725b7d0
(cherry picked from commit 7dbe24e4e5)

12 months ago

2 Commits (838edc112cfd6701797c1c78475a333247a928f2)