[syslinux] [PATCH][git-pull] diag/geodsp/: Fixes/Improvements

[Gene Cumm]

On Fri, Apr 22, 2011 at 16:28, Gene Cumm <gene.cumm at gmail.com> wrote:
> git://git.zytor.com/users/genec/syslinux.git
>
> Branch diag-geodsp-for-hpa
>
> Numerous improvements, most notably that we no longer make 3 8MiB
> images during a build, the .img.xz files will stay untouched after a
> 'make clean;make' and use the program variables from MCONFIG.
>
> I'm still trying to figure out if there's a way to have/simulate a
> prerequisite that is ignored when not present and the target is
> otherwise up to date.
>
> The nearest I can consider is replacing:
>
> %.img.xz: %.bin mk-lba-img
>        ./mk-lba-img $< | $(XZ) -0 > $@
>
> with:
>
> %.img.xz: %.bin
>        make mk-lba-img
>        ./mk-lba-img $< | $(XZ) -0 > $@
>
> such that a 'make clean' deletes the host-specific binary and a
> rebuild will proceed successfully but I'm not sure about the
> parallelism (My make-fu is not strong enough).

The closest I can think of is:

MK_LBA_IMG = mk-lba-img.c $(shell ls mk-lba-img)

%.img.xz: %.bin $(MK_LBA_IMG)
	make mk-lba-img
	./mk-lba-img $< | $(XZ) -0 > $@

which satisfies everything I'm looking for except I don't know about
the parallelism part.  This also updates %.img.xz if mk-lba-img.c is
updated.

-- 
-Gene