diff options
Diffstat (limited to 'build-root/Makefile')
| -rw-r--r-- | build-root/Makefile | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/build-root/Makefile b/build-root/Makefile index f2f77804ad4..0fed520c728 100644 --- a/build-root/Makefile +++ b/build-root/Makefile @@ -653,16 +653,13 @@ configure_check_timestamp = \ # Package build ###################################################################### -linux_n_cpus = `grep '^processor' /proc/cpuinfo | wc -l` - -MAKE_PARALLEL_JOBS = \ - -j $(shell \ - if [ -f /proc/cpuinfo ] ; then \ - expr 2 '*' $(linux_n_cpus) ; \ - else \ - echo 1 ; \ - fi) - +# /proc/cpuinfo does not exist on platforms without a /proc and on some +# platforms, notably inside containers, it has no content. In those cases +# we assume there's 1 processor; we use 2*ncpu for the -j option. +# NB: GNU Make 4.2 will let us use '$(file </proc/cpuinfo)' to both test +# for file presence and content; for now this will have to do. +MAKE_PARALLEL_JOBS = -j $(if $(shell [ -f /proc/cpuinfo ] && head /proc/cpuinfo), \ + $(shell expr 2 '*' $$(grep -c ^processor /proc/cpuinfo)), 2) MAKE_PARALLEL_FLAGS = $(if $($(PACKAGE)_make_parallel_fails),,$(MAKE_PARALLEL_JOBS)) # Make command shorthand for packages & tools. |