title: Can LTO for gcc or clang optimize across C and C++ methods
body: <p>If link-time optimization (LTO) is being used with <a href="https://gcc.gnu.org/wiki/LinkTimeOptimization" rel="noreferrer">gcc</a> or <a href="https://llvm.org/docs/LinkTimeOptimization.html" rel="noreferrer">clang</a>, is it possible that code can be optimized across the C and C++ language boundary?</p>
  
  <p>For example, can a C function be inlined into a C++ caller?</p>