[Reproducible-builds] Minimising work needed for this build-path issue

[HW42]

Ximin Luo:
> Daniel Kahn Gillmor:
>> On Fri 2016-09-09 01:33:00 +0200, HW42 wrote:
>>> According to codesearch.d.n it seems only SOURCE_DIR_ROOT isn't taken
>>> yet. (Google finds at least one case).
>>
>> thanks for looking, that's what i should have done in the first place.
>>
>>> also bikeshedding: I dislike SOURCE_DIR_ROOT because the name is some
>>> how redundant. What's the difference between SOURCE_DIR and
>>> SOURCE_DIR_ROOT? But I don't care much about the naming.
>>
>> if i've got some source with code in three directories, they're all
>> SOURCE_DIRs, but only the top level is SOURCE_DIR_ROOT.
>>
> 
> I can see the benefit in choosing the name carefully; here are my suggestions:
> 
> SOURCE_ROOTDIR
> SOURCE_TOPDIR

With _DIR they are both already used.

> <del>SOURCE_PREFIX</del> oh, already used by firefox :(
> 
> I preferred the ${x}dir style instead of dir_${x} or ${x}_dir because
> of some existing conventions like
> 
> https://www.gnu.org/prep/standards/html_node/Directory-Variables.html

Well, OTOH, freedesktop.org uses _DIR:

https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

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