title: Pragma message in Clang?
body: <p>What's Clang's equivalent to <code>#pragma message</code> as used in <a href="http://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Pragmas.html#Diagnostic-Pragmas" rel="noreferrer">GCC</a> and <a href="http://msdn.microsoft.com/en-us/library/x7dkzch2.aspx" rel="noreferrer">MSVC</a>?</p>