Similarly in build 1959.13 which is supposed to be Clang 5.0 :

$ export MATRIX_EVAL="CC=clang-5.0 && CXX=clang++-5.0"
$ export TRAVIS_COMPILER=clang
$ export CXX=clang++
$ export CXX_FOR_BUILD=clang++
$ export CC=clang
$ export CC_FOR_BUILD=clang
$ clang --version
clang version 7.0.0 (tags/RELEASE_700/final)
[…]
/usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.0/../../../../include/c++/5.4.0/bits/unique_ptr.h:217:18:

Maybe it's nothing, but it'd get me looking.

afaik, it's showing that near the start because 7.0 is the default. Later it installs the correct packages and sets the other vars appropriately.

But for the other quote (not included ) where it shows gcc vars being exported, I'll say again it's because I forgot to add the compiler line to that section.

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