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To: Giorgos Keramidas <keramida@ceid.upatras.gr>
References: <37646522@h30.sp.ipt.ru> <871vs49nmw.fsf@kobe.laptop>
From: Boris Samorodov <bsam@ipt.ru>
Date: Wed, 08 Apr 2009 13:37:09 +0400
In-Reply-To: <871vs49nmw.fsf@kobe.laptop> (Giorgos Keramidas's message of
	"Wed\, 08 Apr 2009 00\:09\:43 +0300")
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Cc: freebsd-questions@FreeBSD.org
Subject: Re: make, list and M pattern
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On Wed, 08 Apr 2009 00:09:43 +0300 Giorgos Keramidas wrote:
> On Tue, 07 Apr 2009 23:54:13 +0400, Boris Samorodov <bsam@ipt.ru> wrote:
> >
> > I need to create a list with some valid values and check an input
> > value. Should this makefile work?
> >
> > -----
> > LIST=f8 f9
> >
> > all:
> > 	@echo USE_LINUX=${USE_LINUX}, LIST=${LIST}
> > .if empty(LIST:M${USE_LINUX})
> > 	@echo The value is invalid
> > .else
> > 	@echo The value is valid
> > .endif
> > -----
> > % make USE_LINUX=f8
> > USE_LINUX=f8, LIST=f8 f9
> > The value is invalid
> > -----

> Hi Boris! :)

Hi Giorgos, Mel and list!

> This is not exactly what you asked for, but you can probably loop
> instead of trying to match regular expressions:

>   keramida@kobe:/tmp$ cat -n Makefile
>        1  LIST= f8 f9
>        2  USE_LINUX?= f9
>        3
>        4  LINUX_VERSION= ${USE_LINUX:C/[ ]*([^ ]*)[ ]*/\1/}
>        5
>        6  .if defined(USE_LINUX)
>        7  .for item in ${LIST}
>        8  .if ${USE_LINUX} == ${item}
>        9  RESULT= ${item}
>       10  .endif
>       11  .endfor
>       12  .endif
>       13
>       14  all:
>       15  .if empty(RESULT)
>       16          @echo Version ${LINUX_VERSION} is not valid.
>       17  .else
>       18          @echo Valid version ${RESULT} selected.
>       19  .endif
>   keramida@kobe:/tmp$ make
>   Valid version f9 selected.
>   keramida@kobe:/tmp$ make -e USE_LINUX=f10
>   Version f10 is not valid.
>   keramida@kobe:/tmp$

Hm, And what if I need to compare two lists and detect if they
have any common items?

VALID_LIST=f8 f9
INPUT_LIST=f6 f7 f8

Nested .for loops are not helpful since .if statement is not
useful here:
.for x in ${VALID_LIST}
. for y in ${INPUT_LIST}
.  if $x == $y   --  make error here


Thanks!


WBR
-- 
Boris Samorodov (bsam)
Research Engineer, http://www.ipt.ru Telephone & Internet SP
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve