add: new cmake option for standalone static library

[ayounes-synaptics]

BOOST_JSON_STANDALONE: new cmake option to enable compilation of
boost::json as a static standalone dependency without any
dependency, it also also compiles the examples.

warning: C++-17 is mandatory in this mode

[vinniefalco]

Wonderful. This is the first time I'm actually happy about seeing a cmake option !!

[ayounes-synaptics]

The failed test seems to be an environment issue:

gpg: requesting key BA9EF27F from hkp server keyserver.ubuntu.com
Error: retrieving gpg key timed out.
gpg: keyserver timed out
gpg: keyserver receive failed: keyserver error
The command "sudo -E apt-add-repository -y "ppa:ubuntu-toolchain-r/test"" failed and exited with 1 during .

[vinniefalco]

The failed test seems to be an environment issue:

Yeah, usually when I restart the build errors like that go away. I'll do it now.

[codecov]

Codecov Report

Merging #29 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop      #29   +/-   ##
========================================
  Coverage    99.27%   99.27%           
========================================
  Files           57       57           
  Lines         4815     4815           
========================================
  Hits          4780     4780           
  Misses          35       35

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[vinniefalco]

voila

[ayounes-synaptics]

voila

Merci :-)