<p>I have tested the codebase with</p>
<ul>
<li>gcc 8.1.0 + <code>CXXFLAGS="-pedantic -Werror -fsanitize=address"</code><br>
and I have received this interesting warning :</li>
</ul>
<pre lang="log"><code>[ 14%] Building CXX object CMakeFiles/osm2pgsql_lib.dir/node-ram-cache.cpp.o
[ 15%] Building CXX object CMakeFiles/osm2pgsql_lib.dir/options.cpp.o
[ 16%] Building CXX object CMakeFiles/osm2pgsql_lib.dir/osmdata.cpp.o
[ 17%] Building CXX object CMakeFiles/osm2pgsql_lib.dir/osmium-builder.cpp.o
/openstreetmap/osm2pgsql/osmium-builder.cpp: In member function 'geom::osmium_builder_t::wkbs_t geom::osmium_builder_t::create_polygons(const osmium::Area&)':
/openstreetmap/osm2pgsql/osmium-builder.cpp:404:22: error: catching polymorphic type 'class osmium::geometry_error' by value [-Werror=catch-value=]
     } catch (osmium::geometry_error) { /* ignored */
                      ^~~~~~~~~~~~~~
[ 18%] Building CXX object CMakeFiles/osm2pgsql_lib.dir/output-gazetteer.cpp.o
cc1plus: all warnings being treated as errors
CMakeFiles/osm2pgsql_lib.dir/build.make:302: recipe for target 'CMakeFiles/osm2pgsql_lib.dir/osmium-builder.cpp.o' failed
</code></pre>
<p>other important:</p>
<ul>
<li>tested with <code>gcc:8</code> official docker image ( <a href="https://hub.docker.com/r/library/gcc/tags/" rel="nofollow">https://hub.docker.com/r/library/gcc/tags/</a>  )</li>
<li>full travis log: <a href="https://travis-ci.org/ImreSamu/osm2pgsql/jobs/388050138" rel="nofollow">https://travis-ci.org/ImreSamu/osm2pgsql/jobs/388050138</a></li>
<li>my experimental travis code -> : <a href="https://github.com/ImreSamu/osm2pgsql/tree/travis_gcc_45678">https://github.com/ImreSamu/osm2pgsql/tree/travis_gcc_45678</a></li>
<li>job passed with : <code>gcc:7</code> , <code>gcc:6</code>, <code>gcc:5</code> , <code>gcc:4</code>   <g-emoji class="g-emoji" alias="+1" fallback-src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f44d.png">👍</g-emoji></li>
</ul>

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