#1713: chicken-install cache doesn't respect isolation

[Chicken Trac]

#1713: chicken-install cache doesn't respect isolation
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            Reporter:  alicemaz  |       Type:  defect
              Status:  new       |   Priority:  minor
           Milestone:  someday   |  Component:  core tools
             Version:  5.2.0     |   Keywords:  chicken-install
Estimated difficulty:  easy      |
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 the directory name "chicken-install" is hardcoded in egg-environment.scm.
 this patch uses the name of the chicken-install binary instead, so that
 different versions of chicken built with PROGRAM_PREFIX or PROGRAM_SUFFIX
 have separate caches

 different versions with different install locations but the same program
 names still overlap, but they would overlap in PATH anyway, so this
 doesn't strike me as a big deal. program prefix/suffix is intended to
 allow complete isolation of multiple builds tho so separating caches feels
 obviously correct. (in my own case, I use my distro's packaged chicken for
 most day-to-day work alongside a prefixed install built from git for
 messing with chicken itself)

 the CHICKEN_EGG_CACHE env var still overrides the default cache location
 unconditionally, which also seems correct even if it allows multiple
 versions' caches to merge, since the point of env vars is to enforce
 something system-wide in all cases invariably

 tested on platform=LINUX

-- 
Ticket URL: <https://bugs.call-cc.org/ticket/1713>
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