-trigraphs option.</li>
<li>The parser recognizes "asm" and "typeof" as keywords in gnu* modes; the
variants "__asm__" and "__typeof__" are recognized in all modes.</li>
+<li>The Apple "blocks" extension is recognized by default in gnu* modes
+on some platforms; it can be enabled in any mode with the "-fblocks"
+option.</li>
<li>Some warnings are different.</li>
</ul>
<li>Commas are allowed in integer constant expressions in *99 modes.</li>
<li>Arrays which are not lvalues are not implicitly promoted to pointers in
*89 modes.</li>
-<li>Constructs like "&*X" are always allowed in *99 modes.</li>
<li>Some warnings are different.</li>
</ul>
relatively small feature, so it is likely to be implemented relatively
soon.</li>
-<li>clang does not implement overloads for the __sync_* builtins
-(<a href="http://llvm.org/bugs/show_bug.cgi?id=2461">bug 3824</a>). The
-builtins only currently work with 32-bit types. This is a relatively
-small feature, so it is likely to be implemented relatively soon.</li>
-
<li>clang does not support code generation for variables pinned to registers
(<a href="http://llvm.org/bugs/show_bug.cgi?id=3933">bug 3933</a>). This
is a relatively small feature, so it is likely to be implemented relatively