From mboxrd@z Thu Jan  1 00:00:00 1970
From: Yann E. MORIN <yann.morin.1998@free.fr>
Date: Mon, 3 Dec 2018 19:31:45 +0100
Subject: [Buildroot] [PATCH 01/11] package/fftw : Allow all precisions
 to be installed at the same time.
In-Reply-To: <08ec2154-5bfb-e77d-7611-1d7662cc6070@mind.be>
References: <1543421561-37355-1-git-send-email-gwenj@trabucayre.com>
 <08ec2154-5bfb-e77d-7611-1d7662cc6070@mind.be>
Message-ID: <20181203183145.GC2548@scaer>
List-Id: <buildroot.busybox.net>
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To: buildroot@busybox.net

Gwenhael, Arnout, All,

On 2018-12-03 17:32 +0100, Arnout Vandecappelle spake thusly:
> On 28/11/2018 17:12, Gwenhael Goavec-Merou wrote:
> > From: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
> > 
> > fftw's library name depends on the precision option. Consequently,
> > it's possible to install multiple flavor on the same target.
> > 
> > This patch split current fftw in 5 part:
> > - 1 to provide common variables
> > - 4 to provide specificities for each precision.
> 
>  This is a huge change, and IIUC all patches should in fact be squashed since
> this change breaks all packages depending on fftw...
> 
>  Maybe a more gradual approach would be to break out the individual packages one
> by one. E.g. start with adding the fftw-single package independently of the
> rest, then convert other packages to depend on fftw-single instead of fftw, then
> remove BR2_PACKAGE_FFTW_PRECISION_SINGLE.
> 
>  Finally, you forgot legacy handling. When you remove
> BR2_PACKAGE_FFTW_PRECISION_SINGLE, there should be an entry added to
> Config.in.legacy that select BR2_PACKAGE_FFTW_SINGLE. Or you have to call the
> package fftw-precision-single, of course.

What about another approach:

  - add a new packages for each of fftw-{single,double,long-double,quad},
  - make fftw depends on all of those that are actually enabled, but
    fftw by itself does nothing,
  - if fftw is enabled, ensure that at least one variant is enabled.

Thus, packages that need any flavour of fftw can just select/depend on
fftw, while those that require specific variant would select/depend what
they need.

Regards,
Yann E. MORIN.

> [snip]
> > +++ b/package/fftw/fftw-double/fftw-double.mk
> > @@ -0,0 +1,23 @@
> > +################################################################################
> > +#
> > +# fft-double
> 
>  fftw-double
> 
>  Don't forget to run check-package!
> 
> > +#
> > +################################################################################
> > +
> > +FFTW_PRECISION_DOUBLE_VERSION = $(FFTW_VERSION)
> > +FFTW_PRECISION_DOUBLE_SOURCE = fftw-$(FFTW_VERSION).tar.gz
> > +FFTW_PRECISION_DOUBLE_SITE = $(FFTW_SITE)
> > +FFTW_PRECISION_DOUBLE_INSTALL_STAGING = $(FFTW_INSTALL_STAGING)
> > +FFTW_PRECISION_DOUBLE_LICENSE = $(FFTW_LICENSE)
> > +FFTW_PRECISION_DOUBLE_LICENSE_FILES = $(FFTW_LICENSE_FILES)
> > +
> > +FFTW_PRECISION_DOUBLE_CONF_ENV = $(FFTW_CONF_ENV)
> > +
> > +FFTW_PRECISION_DOUBLE_CONF_OPTS= $(FFTW_CONF_OPTS)
> > +
> > +FFTW_PRECISION_DOUBLE_CFLAGS = $(FFTW_CFLAGS)
> > +
> > +# x86 optimisations
> > +FFTW_PRECISION_DOUBLE_CONF_OPTS += $(if $(BR2_X86_CPU_HAS_SSE2),--enable,--disable)-sse2
> > +
> > +$(eval $(autotools-package))
> 
>  This doesn't work: the package is actually called 'fftw-double', so it will use
> variables FFTW_DOUBLE_VERSION etc., not FFTW_PRECISION_DOUBLE_VERSION. I don't
> know how you tested this, but it can't possibly work...
> 
> [snip]
> _______________________________________________
> buildroot mailing list
> buildroot at busybox.net
> http://lists.busybox.net/mailman/listinfo/buildroot

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