[Buildroot] [PATCH 03/16 v4] core/pkg-utils: add macro to hardlink-or-copy

[Yann E. MORIN <yann.morin.1998@free.fr>]

Luca, All,

On 2016-02-12 23:28 +0100, Luca Ceresoli spake thusly:
> On 03/02/2016 23:21, Yann E. MORIN wrote:
> > This macro will try to copy a source file into a destination directory,
> > by first attempting to hard-link, and falling back to a plain copy.
> > 
> > In some situations, it will be necessary that the destination file is
> > named differently than the source (e.g. due to a re-numbering), so if a
> > third argument is specified, it is treated as the basename of the
> > destination file.
[--SNIP--]
> > +define hardlink-copy
> > +	{ mkdir -p $(2) && \
> > +	  rm -f        $(strip $(2))/$(if $(3),$(strip $(3)),$(notdir $(1))) && \
> > +	  { ln -f $(1) $(strip $(2))/$(if $(3),$(strip $(3)),$(notdir $(1))) 2>/dev/null || \
> > +	    cp -f $(1) $(strip $(2))/$(if $(3),$(strip $(3)),$(notdir $(1))); \
> > +	  } \
> > +	}
> > +endef
> 
> Unfortunately this version of the patch does not seem to work, although
> I can't wrap my head around the reason. What's happening is _weird_.

Damned, that's right. It's broke... :-/

> If I apply all of your patches up to 10/16, 'make legal-info' works. If
> I add patch 11 ("core/legal-info: also save patches"), it does not. Add
> patch 12 and it works again.
[--SNIP--]
> This is the best I could understand at the moment... :-(

Thanks for the detailed analysis! :-)
I'll investigate this further.

Regards,
Yann E. MORIN.

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