<p>In <a href="https://github.com/mlpack/mlpack/pull/720#discussion_r70869390">CMakeLists.txt</a>:</p>
<pre style='color:#555'>&gt; @@ -74,6 +74,34 @@ if(&quot;${CMAKE_CXX_COMPILER_ID}&quot; STREQUAL &quot;Clang&quot;)
&gt;    set(CMAKE_MODULE_LINKER_FLAGS &quot;${CMAKE_MODULE_LINKER_FLAGS} -lm&quot;)
&gt;  endif()
&gt;  
&gt; +# Setup build for test coverage
&gt; +if(BUILD_WITH_COVERAGE)
&gt; +  # Currently coverage only works with GNU g++
&gt; +  if (&quot;${CMAKE_CXX_COMPILER_ID}&quot; STREQUAL &quot;GNU&quot;)
&gt; +    # Find gcov and lcov
&gt; +    find_program(GCOV gcov)
&gt; +    find_program(LCOV lcov)
&gt; +
&gt; +    if(NOT GCOV)
&gt; +      message(FATAL_ERROR &quot;gcov not found! Aborting...&quot;)
&gt; +    endif()
&gt; +
&gt; +    set(CMAKE_CXX_FLAGS &quot;${CMAKE_CXX_FLAGS} --coverage -fno-inline -fno-inline-small-functions -fno-default-inline -fprofile-arcs -fkeep-inline-functions&quot;)
&gt; +    message(WARNING &quot;Adding debug options for coverage&quot;)
</pre>
<p>Ahh yes. I will change it.</p>

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