[Github-comments] [geany/geany] add gcc 7 and 8 build to travis tests (#2067)

[Colomban Wendling]

> Here clang 3.9 works, clang 5.0 fails. Note `make clean` needed to make it fail. 

Do you build a clean clone each time?  Needing `make clean` doesn't suggest so, and I personally wouldn't try rebuilding half the project with another compiler and expect things to go smoothly :)
Also, just to me sure: you need to re-run configure with the new values of `CC` and `CXX`, not merely run `make CC=... CXX=...` -- the later *could* work, but it also could fail.

https://travis-ci.org/geany/geany/jobs/528683476, build 1959.12:
> ```
> $ export MATRIX_EVAL="CC=clang-3.5 && CXX=clang++-3.5"
>$ export TRAVIS_COMPILER=gcc
>$ export CXX=g++
>$ export CXX_FOR_BUILD=g++
>$ export CC=gcc
>$ export CC_FOR_BUILD=gcc
> ```

That's already suspicious.  And the job summary suggest Travis thinks it's gcc, but we set clang-3.5.

> ```
>/usr/bin/../lib/gcc/x86_64-linux-gnu/4.8/../../../../include/c++/4.8/bits/unique_ptr.h:166:18:
>```

*That* gets me worried: it looks like it's using GCC 4.8 include paths with Clang…

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.

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