<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a>, optimization flags set in CMakeLists are not supported by all compilers, use<br>
<a href="https://cmake.org/cmake/help/v3.0/module/CheckCXXCompilerFlag.html?highlight=checkcxxcompiler#module:CheckCXXCompilerFlag">https://cmake.org/cmake/help/v3.0/module/CheckCXXCompilerFlag.html?highlight=checkcxxcompiler#module:CheckCXXCompilerFlag</a><br>
instead of guessing:<br>
if(CMAKE_COMPILER_IS_GNUCC OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")</p>

<pre><code>  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99 -O3")
</code></pre>

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