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build: set minimum supported macOS to 10.12

Description

build: set minimum supported macOS to 10.12

Summary:

Reasoning:

    10.10 has been unsupported since July 2017 (~3 years at v0.20.0
release)
    10.11 has been unsupported since July 2018 (~2 years at v0.20.0
release)
    macOS users are consistent at upgrading to new releases.
    Qt 5.12 LTS only supports macOS > 10.12. As long as we're supporting
macOS < 10.12 we would not be able to bump Qt in depends to 5.12 for the
v0.20.0 release.

Backport of core PR17550.

Test Plan:
Run the OSX Gitian build.
Run the binary on 10.12 and 10.15.

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D5514

Details

Provenance
fanquake <fanquake@gmail.com>Authored on Nov 21 2019, 16:08
FabienCommitted on Mar 20 2020, 19:51
nakihitoPushed on Mar 20 2020, 21:27
Reviewer
Restricted Project
Differential Revision
D5514: build: set minimum supported macOS to 10.12
Parents
rSTAGING17c73ea83a2f: Remove unused misc.h
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