Travis-CI: Try more recent compilers with docker #196
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precise is now EOL, and so by default travis will route to trusty
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This checks online if the local copy of debian:buster is still up to date.
Recent clang versions include this diagnostic. Until it is confirmed whether this is a false positive, a library misuse or an upstream bug, it should stay in as a warning.
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Upstream brew formula for poppler does no longer build against qt4, it always uses qt5.
This includes gcc-7, gcc-8, clang-5.0 and clang-6.0
Both compilers support a warning about unnecessary parenthesis in code. Both get triggered by the auto-generated code from Qt's moc. Since the issue is not in the local code, it should not stop compilation.
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In order to reproduce #191 I created a local docker image with clang-5.0.
This PR includes that docker images definition and a small wrapper script to make travis build the image, and then try to compile dspdfviewer inside the docker container.