make, list and M pattern

[Boris Samorodov]

On Wed, 8 Apr 2009 08:45:04 +0200 Mel Flynn wrote:
> On Tuesday 07 April 2009 21:54:13 Boris Samorodov wrote:
> > Hello List,
> >
> >
> > 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 Mel!

> Doesn't work because the match is not on words of the list but on the full 
> list and you're not using globs.

You are ringht, but not for the case. The case here seems to exist
because variables are not guaranteed to be expanded for M modifier.
I.e. even with globs the result will not be as expected.

> Aside from Giorgos' method, one might consider:
> LIST=f8 f9
> LINUX_VER=invalid

> .for _VERSION in ${LIST}
> .if (${USE_LINUX} == "${_VERSION}")
> LINUX_VER=${_VERSION}
> .endif
> .endfor

> all:
> .if !empty(LINUX_VER:Minvalid)
>         @echo "Invalid linux version: ${USE_LINUX}"
> .else
>         @echo "Using linux version ${LINUX_VER}"
> .endif

Works. Thanks!


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