Follow-up Comment #3, bug #24568 (project wesnoth):
It seems rather excessive to optimize this early for a compiler that only a
couple of people's private builds (and no production builds) can benefit from,
unless the intention is to make the feature available and fully-supported for
a broader audience (e.g. people on GCC 5 and later
<https://gcc.gnu.org/projects/cxx-status.html#cxx14>).
The issue with Travis is that last time I checked they did not provide build
environments running anything newer than Ubuntu trusty, which only includes
gcc 4.8 at most. You could just add a PPA that includes the right GCC version,
but it's up to you to figure out what to do if the PPA maintainers decide to
switch versions/close it down/drop support for trusty/insert malware in the
compiler binaries; the rest should be relatively simple. I'm sure an actual
Ubuntu user could give some recommendations here.
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