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Makefile: allow top-level parallel build with BR2_PER_PACKAGE_DIRECTORIES=y 

With per-package folder support, top-level parallel build becomes
safe, so we can enclose the .NOTPARALLEL statement in a
!BR2_PER_PACKAGE_DIRECTORIES condition.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2020.02.x
Thomas Petazzoni 2019-11-05 17:46:41 +01:00 committed by Peter Korsgaard
parent c4e6d5c8be
commit d9a4c0c7ea
1 changed files with 5 additions and 14 deletions
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19
Makefile
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@ -227,21 +227,12 @@ ifeq ($(filter $(noconfig_targets),$(MAKECMDGOALS)),)
-include $(BR2_CONFIG)
endif
# Parallel execution of this Makefile is disabled because it changes
# the packages building order, that can be a problem for two reasons:
# - If a package has an unspecified optional dependency and that
# dependency is present when the package is built, it is used,
# otherwise it isn't (but compilation happily proceeds) so the end
# result will differ if the order is swapped due to parallel
# building.
# - Also changing the building order can be a problem if two packages
# manipulate the same file in the target directory.
#
# Taking into account the above considerations, if you still want to execute
# this top-level Makefile in parallel comment the ".NOTPARALLEL" line and
# use the -j<jobs> option when building, e.g:
# make -j$((`getconf _NPROCESSORS_ONLN`+1))
ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),)
# Disable top-level parallel build if per-package directories is not
# used. Indeed, per-package directories is necessary to guarantee
# determinism and reproducibility with top-level parallel build.
.NOTPARALLEL:
endif
# timezone and locale may affect build output
ifeq ($(BR2_REPRODUCIBLE),y)