<div dir="ltr">Thanks, that's the reason.<div><br></div>So to clarify, I should use <span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">-DLLVM_ENABLE_LIBCXX=ON</span>

 only if I am building clang with clang?<div>I got confused, I thought it was for building libc++, but having that under projects seems to be enough.<br><div><br></div><div>Thanks.</div><div>Simone</div></div></div>