On Feb 23, 2005, at 5:54 PM, Pete Johnson wrote:
This works for me in GNU Make 3.80:
define foo multi line message output endef
define newline
endef
space := space += #
safe-char := | make-list-at-newline = $(subst $(newline),$(space),$(subst $(space),$(safe-char),$1)) output-message = $(foreach m,$(call make-list-at-newline,$1), $(shell echo $(subst $(safe-char),$(space),$m) 1>&2))
$(call output-message,$(foo)) $(call output-message,single line)
One problem with this (aside from output going to stderr and one process per line of output) is that shell meta-characters in the string need to be quoted. We can do this by putting quotes around the arguments to echo, but we also need to back-quote any quote characters inside. This seems pretty convoluted.
And after more experimenting, I don't see how to quote tabs because I can't get them into a variable or literal, and multiple newlines get collapsed into a single newline. It just kind of snowballs out of control.
-Pete
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