branch master updated (eda0522 -> b4c42a4)

[Ludovic Courtès]

civodul pushed a change to branch master
in repository guix.

      from  eda0522   gnu: letsencrypt, python-acme: Update to 0.4.2.
       new  c8f9f24   guix build: Set the build options early.
       new  7bfeb9d   tests: Narinfos can specify an non-empty reference list.
       new  6581ec9   store: Add 'references/substitutes'.
       new  c90cb5c   grafts: Use dependency information from substitutes when 
possible.
       new  fcadd9f   packages: The result of 'bag-grafts' does not contain 
duplicates.
       new  d4da602   grafts: Memoize intermediate results in 
'cumulative-grafts'.
       new  b4c42a4   tests: Disable tests that would rebuild the world due to 
grafting.

The 7 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.


Summary of changes:
 guix/grafts.scm        |  113 +++++++++++++++++++++++++++++++++++------------
 guix/packages.scm      |    7 +++-
 guix/scripts/build.scm |   98 +++++++++++++++++++++--------------------
 guix/store.scm         |   41 +++++++++++++++++
 guix/tests.scm         |   51 +++++++++++++++-------
 tests/packages.scm     |   67 ++++++++++++++++++++++------
 tests/store.scm        |   35 +++++++++++++++
 7 files changed, 304 insertions(+), 108 deletions(-)