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| author | Fabio Porcedda <fabio.porcedda@gmail.com> | 2014-02-14 10:55:08 +0100 |
|---|---|---|
| committer | Peter Korsgaard <peter@korsgaard.com> | 2014-02-14 21:10:03 +0100 |
| commit | 2afb23a70270657a9887e35ffa0af4c248ae0b25 (patch) | |
| tree | 91b8368a5d6e33dc109cb9849c25ab4aef8d6fd5 | |
| parent | 069b33a30e6d71454ba8cf3b41d1ee2db14549e7 (diff) | |
| download | buildroot-2afb23a70270657a9887e35ffa0af4c248ae0b25.tar.gz buildroot-2afb23a70270657a9887e35ffa0af4c248ae0b25.zip | |
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 <fabio.porcedda@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
| -rw-r--r-- | Makefile | 15 |
1 files changed, 14 insertions, 1 deletions
@@ -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 |
