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

[Pete Johnson]

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