From 2afb23a70270657a9887e35ffa0af4c248ae0b25 Mon Sep 17 00:00:00 2001 From: Fabio Porcedda Date: Fri, 14 Feb 2014 10:55:08 +0100 Subject: [PATCH] Makefile: update comment about top-level parallel Makefile After the latest patches top-level parallel Makefile is working but there is still an issue when a package has an unspecified optional dependency so change the comment to explain that. Signed-off-by: Fabio Porcedda Signed-off-by: Peter Korsgaard --- Makefile | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index c89107ad30..ddb1f6ae8a 100644 --- a/Makefile +++ b/Makefile @@ -42,7 +42,20 @@ export HOSTARCH := $(shell uname -m | \ -e s/macppc/powerpc/\ -e s/sh.*/sh/) -# This top-level Makefile can *not* be executed in parallel +# Parallel execution of this Makefile is disabled because it changes +# the packages building order, that can be a problem for two reasons: +# - If a package has an unspecified optional dependency and that +# dependency is present when the package is built, it is used, +# otherwise it isn't (but compilation happily proceeds) so the end +# result will differ if the order is swapped due to parallel +# building. +# - Also changing the building order can be a problem if two packages +# manipulate the same file in the target directory. +# +# Taking into account the above considerations, if you still want to execute +# this top-level Makefile in parallel comment the ".NOTPARALLEL" line and +# build using the following command: +# make BR2_JLEVEL= -j$((`getconf _NPROCESSORS_ONLN`+1)) .NOTPARALLEL: # absolute path -- 2.30.2