Ah! I finally have a progress bar that doesn't stall the build!
- pipe size in Linux is only 8*512=4096 bytes
- pipe size is not setable
- when the feeding process spits out data faster than the eating
process can read it, then the feeding process stalls after 4KiB
of data sent to the pipe
- for us, the progress bar would spawn a sub-shell every line,
and the sub-shell would in turn spawn a 'date' command.
Which was sloooww as hell, and would cause some kind of a
starvation: the pipe was full most of the time, and the
feeding process was stalled all this time.

Now, we use internal variables and a little hack based onan offset
to determine the elapsed time. Much faster this way, but still
CPU-intensive.

 # Build a list of all available samples

 CT_SAMPLES = $(patsubst $(CT_TOP_DIR)/samples/%/crosstool.config,%,$(filter-out %Makefile,$(wildcard $(CT_TOP_DIR)/samples/*/crosstool.config)))

 .PHONY: $(SAMPLES)

 $(CT_SAMPLES):

 	@cp "$(CT_TOP_DIR)/samples/$(@)/crosstool.config" "$(CT_TOP_DIR)/.config"

 	@$(MAKE) oldconfig

 help::

 	@echo  'Preconfigured targets:'

 	@$(CT_TOP_DIR)/scripts/showSamples.sh $(CT_SAMPLES)

 	@echo  ''

 saveconfig:

 	@$(CT_TOP_DIR)/scripts/saveSample.sh