Boost gets tag "compiled-by-unknown_host-compiler" #34
Description
I have noticed that when Boost is installed as a Caffe dependency (and possibly standalone), in addition to compiled-by-gcc and and compiled-by-gcc-<version tags, it gets a weird compiled-by-unknown_host-compiler tag:
$ ck show env --tags=boost,lib
Env UID: Target OS: Bits: Name: Version: Tags:
49673bc810e4d8e9 linux-64 64 Boost library 1.67.0-min-for-caffe 64bits,boost,channel-stable,compiled-by-gcc,compiled-by-gcc-8.1.0,compiled-by-unknown_host-compiler,host-os-linux-64,lib,min-for-caffe,target-os-linux-64,v1,v1.67,v1.67.0,v1.67.0-min-for-caffe,v1.67.0.0,v1.67.0.0.0,v1.67.0.0.0.0
002ceccabd454515 linux-64 64 Boost library 1.67.0-min-for-caffe 64bits,boost,channel-stable,compiled-by-llvm,compiled-by-llvm-5.0.0-3~16.04.1,compiled-by-unknown_host-compiler,host-os-linux-64,lib,min-for-caffe,target-os-linux-64,v1,v1.67,v1.67.0,v1.67.0-min-for-caffe,v1.67.0.0,v1.67.0.0.0,v1.67.0.0.0.0
c0aefcb48a2b39f7 linux-64 64 Boost library 1.67.0-min-for-caffe 64bits,boost,channel-stable,compiled-by-gcc,compiled-by-gcc-7.3.0,compiled-by-unknown_host-compiler,host-os-linux-64,lib,min-for-caffe,target-os-linux-64,v1,v1.67,v1.67.0,v1.67.0-min-for-caffe,v1.67.0.0,v1.67.0.0.0,v1.67.0.0.0.0
90bbc584d0260b58 linux-64 64 Boost library 1.66.0-min-for-caffe 64bits,boost,channel-stable,compiled-by-gcc,compiled-by-gcc-6.4.0,compiled-by-unknown_host-compiler,host-os-linux-64,lib,min-for-caffe,target-os-linux-64,v1,v1.66,v1.66.0,v1.66.0-min-for-caffe,v1.66.0.0,v1.66.0.0.0,v1.66.0.0.0.0
508a59286c69b492 linux-64 64 Boost library 1.66.0 64bits,boost,channel-stable,compiled-by-gcc,compiled-by-gcc-6.4.0,compiled-by-unknown_host-compiler,host-os-linux-64,lib,target-os-linux-64,v1,v1.66,v1.66.0