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| -rw-r--r-- | www/compatibility.html | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/www/compatibility.html b/www/compatibility.html index 4196e880ec..bd22f9a8dc 100644 --- a/www/compatibility.html +++ b/www/compatibility.html @@ -42,6 +42,7 @@ <li><a href="#super-cast">Cast of super</a></li> <li><a href="#sizeof-interface">Size of interfaces</a></li> <li><a href="#objc_objs-cast">Internal Objective-C types</a></li> + <li><a href="#c_variables-class">C variables in @class or @protocol</a></li> </ul> </li> <li><a href="#c++">C++ compatibility</a> @@ -283,6 +284,24 @@ void f(id x); instead of the internal types.</p> <!-- ======================================================================= --> +<h3 id="c_variables-class">C variables in @class or @protocol</h3> +<!-- ======================================================================= --> + +<p>GCC allows declaration of C variables in a @class or @protocol, but not +C functions. Clang does not allow variable or C function declarations. External +declarations, however, is allowed. Variables may only be declared in an +@implementation. + +<pre> +@interface XX +int x; // not allowed in clang +int one=1; // not allowed in clang +extern int OK; +@end + +</pre> + +<!-- ======================================================================= --> <h2 id="c++">C++ compatibility</h3> <!-- ======================================================================= --> |