Re: A function to print instead of $(warning ) or $(error )

[John Graham-Cumming]

On Wed, 2005-02-23 at 07:00 -0800, Pete Johnson wrote:
> The irony in all of this is that adding a function say "print" to make 
> to do this would only take a few lines of code in function.c, but I 
> just can't figure out how to do it within make.

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)

The newline variable contains a newline, which is created by making a
define with _two_ blank lines in it.  space contains a space.  safe-char
contains a character that will be guaranteed not to appear in the text
to be output; I picked the pipe character, but you can choose anything
(or could be a sequence of characters).

make-list-at-newline converts all spaces to the safe-char and then
splits the resulting string into a list (space separated) at the
newlines.

output-message converts the safe-char back to space and calls echo for
each part of its input that ends with a newline (or is the last string).

John.
-- 
John Graham-Cumming

Home: http://www.jgc.org/
Work: http://www.electric-cloud.com/
POPFile: http://getpopfile.org/
GNU Make Standard Library: http://gmsl.sf.net/