clang doesn't accept some constructs gcc might accept in contexts where a
constant expression is required, like "x-x" where x is a variable.</li>
-<li>clang does not support multiple alternative constraints in inline asm; this
-is an extremely obscure feature which would be complicated to implement
-correctly.</li>
-
<li>clang does not support __builtin_apply and friends; this extension is
extremely obscure and difficult to implement reliably.</li>