On Sat, Jun 02, 2007 at 05:25:50AM +0800, [EMAIL PROTECTED] wrote:
> Your
> reverse = $(2) $(1)
> example in the manual is great, however if one day your users happen
> to want to quote a comma,
> OK:;echo $(call reverse,a,b)
> SORRY1:;echo $(call reverse,a\,b,c)
> SORRY2:;echo $(call reverse,"a,b",c)
> then they are S.O.L. unless you mention how.
>
> One apparently needs to do
> EE=a,b
> OK2:;echo $(call reverse,$(EE),c)
>
> Mention that it is the only(?) way.
>
> Wait,
> OK3:;s=,;echo $(call reverse,a$${s}b,c)
>From info make:
Commas and unmatched parentheses or braces cannot appear in the text
of an argument as written; leading spaces cannot appear in the text of
the first argument as written. These characters can be put into the
argument value by variable substitution. First define variables
`comma' and `space' whose values are isolated comma and space
characters, then substitute these variables where such characters are
wanted, like this:
comma:= ,
empty:=
space:= $(empty) $(empty)
foo:= a b c
bar:= $(subst $(space),$(comma),$(foo))
# bar is now `a,b,c'.
Here the `subst' function replaces each space with a comma, through the
value of `foo', and substitutes the result.
Available online here:
http://uw713doc.sco.com/cgi-bin/info2html?(make.info)Syntax%2520of%2520Functions&lang=en
That should cover it.
Sam
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