allow specifying number of concurrent jobs
If defined, Use MAKE_PARALLEL_JOBS as number of concurrent jobs for
build process instead of the internal calculation based on /proc/cpuinfo.
@@ -648,8 +648,12 @@ configure_check_timestamp = \
# 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.
+ifndef MAKE_PARALLEL_JOBS
MAKE_PARALLEL_JOBS = -j $(if $(shell [ -f /proc/cpuinfo ] && head /proc/cpuinfo), \
$(shell grep -c ^processor /proc/cpuinfo), 2)
+else
+MAKE_PARALLEL_JOBS := -j $(MAKE_PARALLEL_JOBS)
+endif
MAKE_PARALLEL_FLAGS ?= $(if $($(PACKAGE)_make_parallel_fails),,$(MAKE_PARALLEL_JOBS))
# Make command shorthand for packages & tools.
