USE_PACKAGE_DEPENDS_ONLY set - not building missing dependency from source

[Bryan Drewery]

On 6/26/16 5:00 AM, Jan Beich wrote:
> pkg-fallout at FreeBSD.org writes:
> 
>> Ident:          $FreeBSD: head/multimedia/vapoursynth/Makefile 415615 2016-05-22 01:10:34Z jbeich $
>> Log URL:        http://beefy5.nyi.freebsd.org/data/101i386-default/417455/logs/vapoursynth-r32.log
>> Build URL:      http://beefy5.nyi.freebsd.org/build.html?mastername=101i386-default&build=417455
>> Log:
>>
>> build started at Sat Jun 25 02:32:41 UTC 2016
> [...]
>> =======================<phase: build-depends  >============================
>> ===>   vapoursynth-r32 depends on executable: sphinx-build - not found
>> ===>   vapoursynth-r32 depends on package: /packages/All/py34-sphinx-1.4.4.txz - not found
>> ===>   USE_PACKAGE_DEPENDS_ONLY set - not building missing dependency from source
>> *** Error code 1
> 
> I'm starting to get failures for a port that hasn't changed for a month.
> Anyone got a clue? The regression appears to be from r417413 which landed
> without an exp-run suggesting any fallout is due to badly written ports.
> 

r417413 was the right fix either way as the old code before the
do-depends.sh conversion was also passing DEPENDS_ARGS:

subpkgfile=`(cd $$dir; ${MAKE} $$depends_args -V PKGFILE)`; \

The problem here is a bug in Poudriere not handling DEPENDS_ARGS
properly.  The port is forcing python3 as the default even though
packages are built with default 2.  Dependencies are only built for
python2 and this port wants a python3 dependency.  It's covered in
https://github.com/freebsd/poudriere/issues/259.  I've been working on a
fix lately and am close to having it complete, which is why I did
r417413, because the framework was doing the wrong thing.

net/tiny-network-utilities is another example where this is a problem
and PACKAGE_BUILDING was used to set IGNORE to avoid the problem for now.

-- 
Regards,
Bryan Drewery

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