title: clang compile c++ to wasm , stdio.h not found error occurs
body: <p>I typed：</p>
  
  <pre><code> clang -emit-llvm --target=wasm32 -Oz my.cpp -c -o math.bc
  </code></pre>
  
  <p>There have always been the following errors:</p>
  
  <pre><code>my.cpp:1:10: fatal error: 'stdio.h' file not found
  #include &lt;stdio.h&gt;
           ^~~~~~~~~
  </code></pre>
  
  <p>my source as following:</p>
  
  <pre><code>
  #include "stdio.h"
  #include "math.h"
  
  void ttt()
  {
          double ww = pow((double)2.0, (double)0.3);
          print(ww);
  }
  </code></pre>