<blockquote>
<p>Similarly in build 1959.13 which is supposed to be Clang 5.0 :</p>
<blockquote>
<pre><code>$ 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:
</code></pre>
</blockquote>
<p>Maybe it's nothing, but it'd get me looking.</p>
</blockquote>
<p>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.</p>
<p>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.</p>

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