Import cmake/ from commit 5f82198c in opm-core

GNUmakefile

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+# GNUmakefile is processed before Makefile, which is why we arrive here
+# first; when we call the other makefile, then we must specify its real
+# name with the -f parameter
+
+# figure out the number of processors from the system, add one and round
+# to nearest integer. this is the maximum number of processes we want running
+# at the same time (one for each core and one stuck on I/O)
+# if we are running this is a VM, then /proc won't be mounted and we revert
+# to single CPU processing
+CPUINFO:=/proc/cpuinfo
+NUM_CPUS:=$(shell test -r $(CPUINFO) && grep -P -c '^processor\t:' $(CPUINFO) || echo 0)
+PROCS:=$(shell echo "("$(NUM_CPUS)+1")"/1 | bc)
+
+# use these utilities if they are available
+IONICE:=$(shell test -x "$$(which ionice)" && echo ionice -c2 -n7)
+NICE:=$(shell test -x "$$(which nice)" && echo nice)
+
+# we do dependency management the right way; don't attempt to cache
+export CCACHE_DISABLE:=1
+
+# ignore that there may be files with these names, we are going to call
+# the other make regardless
+.PHONY: __everything $(MAKECMDGOALS)
+
+# outsource the processing to the real makefile, running in parallel and
+# in a nice environment so that it doesn't hog our workstation. if there
+# is nothing else happening on the box, then it will run just as fast
+# the leading plus makes us run this regardless of options, see
+# http://www.gnu.org/software/make/manual/make.html#Instead-of-Execution
+__everything:
+# only put on a parallel flag if there isn't already one; otherwise we
+# get the warning "-jN forced in submake: disabling jobserver mode".
+# this have to happen inside the rule, because -j option is removed from
+# MAKEFLAGS outside
+	+@$(IONICE) $(NICE) $(MAKE) --no-print-directory -f Makefile $(if $(findstring -j,$(MAKEFLAGS)),,-j $(PROCS)) $(MAKECMDGOALS)
+
+# automatically generate all the goals we are asked to make and delegate
+# processing of them to the real makefile through the dependency (since
+# everything depends on the same thing, then we only call the other make
+# once). the dummy command is just there to make sure that make doesn't
+# show the "Nothing to do for `foo'" message after processing
+$(MAKECMDGOALS): __everything
+	@true