K 10
svn:author
V 4
ngie
K 8
svn:date
V 27
2019-04-10T22:19:47.599108Z
K 7
svn:log
V 384
Rework r345708

* Default to gnu++14 with clang++ and g++ 6.x+ according to the defaults of
  each compile toolchain.
* Do not override user-specified values for `-std=*`. Some ports rely on this
  functionality.

This patch is similar to the one submitted by jbeich, however, it aims to
optimize the latter case by not testing the compiler version, etc, at all.

Reported by:	jbeich

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