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Chapter 12: Extending GNU make 135

define GUILEIO

;; A simple Guile IO library for GNU make

(define MKPORT #f)

(define (mkopen name mode)

(set! MKPORT (open-file name mode))

#f)

(define (mkwrite s)

(display s MKPORT)

(newline MKPORT)

#f)

(define (mkclose)

(close-port MKPORT)

#f)

endef

# Internalize the Guile IO functions

$(guile $(GUILEIO))

If you have a signiﬁcant amount of Guile support code, you might consider keeping it

in a diﬀerent ﬁle (e.g., guileio.scm) and then loading it in your makeﬁle using the guile

function:

$(guile (load "guileio.scm"))

An advantage to this method is that when editing guileio.scm, your editor will under-

stand that this ﬁle contains Scheme syntax rather than makeﬁle syntax.

Now you can use these Guile functions to create ﬁles. Suppose you need to operate on

a very large list, which cannot ﬁt on the command line, but the utility you’re using accepts

the list as input as well:

prog: $(PREREQS)

@$(guile (mkopen "tmp.out" "w")) \

$(foreach X,$^,$(guile (mkwrite "$(X)"))) \

$(guile (mkclose))

$(LINK) < tmp.out

A more comprehensive suite of ﬁle manipulation procedures is possible of course. You

could, for example, maintain multiple output ﬁles at the same time by choosing a symbol

for each one and using it as the key to a hash table, where the value is a port, then returning

the symbol to be stored in a make variable.

12.2 Loading Dynamic Objects

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Roland Ver. 4.5 Technical Information Seite 145