[Buildroot] [PATCH 1 of 2 v2] infra: introduce suitable-extractor helper function

Thomas De Schampheleire patrickdepinguin+buildroot at gmail.com
Fri Aug 2 08:50:44 UTC 2013

On Fri, Aug 2, 2013 at 10:28 AM, Thomas Petazzoni
<thomas.petazzoni at free-electrons.com> wrote:
> Dear Thomas De Schampheleire,
> On Thu, 01 Aug 2013 22:55:47 +0200, Thomas De Schampheleire wrote:
>> diff --git a/package/pkg-utils.mk b/package/pkg-utils.mk
>> --- a/package/pkg-utils.mk
>> +++ b/package/pkg-utils.mk
>> @@ -62,6 +62,8 @@ INFLATE.tbz2 = $(BZCAT)
>>  INFLATE.tgz  = $(ZCAT)
>>  INFLATE.xz   = $(XZCAT)
>>  INFLATE.tar  = cat
>> +# suitable-extractor(filename): returns extractor based on suffix
>> +suitable-extractor = $(firstword $(INFLATE$(suffix $(1))))
> Do you know why we need this $(firstword ...) call here? In all places
> in was using directly $(INFLATE$(...)), except in the package
> infrastructure where it was doing this firstword additional call.
> It was added by Peter in 2c6390a5d0c01420879e9f23bc89afb19976da4a.

It wasn't clear to me when I sent the patch, but I figured it didn't hurt.
But now I think I know: the inflate targets originate from the
.config, and users can add extra arguments there. In fact, the default
for $(ZCAT) is:
BR2_ZCAT="gzip -d -c"

To check the dependency, we only want to check for 'gzip', but to do
the actual inflate, we shouldn't use 'firstword'. So, the patch is
wrong, and I will fix it :)

Thanks for highlighting this!

Best regards,

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