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<h3 class="section">Options Controlling Objective-C Dialect</h3>
<p>This section describes the command-line options that are only meaningful
for Objective-C programs; but you can also use most of the GNU compiler
options regardless of what language your program is in. For example,
you might compile a file <code>some_class.m</code> like this:
<pre class="example"> gcc -g -fgnu-runtime -O -c some_class.m
</pre>
<p>In this example, only <code>-fgnu-runtime</code> is an option meant only for
Objective-C programs; you can use the other options with any language
supported by GCC.
<p>Here is a list of options that are <em>only</em> for compiling Objective-C
programs:
<dl>
<dt><code>-fconstant-string-class=</code><var>class-name</var><code></code>
<dd>Use <var>class-name</var> as the name of the class to instantiate for each
literal string specified with the syntax <code>@"..."</code>. The default
class name is <code>NXConstantString</code>.
<br><dt><code>-fgnu-runtime</code>
<dd>Generate object code compatible with the standard GNU Objective-C
runtime. This is the default for most types of systems.
<br><dt><code>-fnext-runtime</code>
<dd>Generate output compatible with the NeXT runtime. This is the default
for NeXT-based systems, including Darwin and Mac OS X. The macro
<code>__NEXT_RUNTIME__</code> is predefined if (and only if) this option is
used.
<br><dt><code>-gen-decls</code>
<dd>Dump interface declarations for all classes seen in the source file to a
file named <code></code><var>sourcename</var><code>.decl</code>.
<br><dt><code>-Wno-protocol</code>
<dd>If a class is declared to implement a protocol, a warning is issued for
every method in the protocol that is not implemented by the class. The
default behavior is to issue a warning for every method not explicitly
implemented in the class, even if a method implementation is inherited
from the superclass. If you use the <code>-Wno-protocol</code> option, then
methods inherited from the superclass are considered to be implemented,
and no warning is issued for them.
<br><dt><code>-Wselector</code>
<dd>Warn if multiple methods of different types for the same selector are
found during compilation. The check is performed on the list of methods
in the final stage of compilation. Additionally, a check is performed
that for each selector appearing in a <code>@selector(...)</code>
expression, a corresponding method with that selector has been found
during compilation. Because these checks scan the method table only at
the end of compilation, these warnings are not produced if the final
stage of compilation is not reached, for example because an error is
found during compilation, or because the <code>-fsyntax-only</code> option is
being used.
<br><dt><code>-Wundeclared-selector</code>
<dd>Warn if a <code>@selector(...)</code> expression referring to an
undeclared selector is found. A selector is considered undeclared if no
method with that name has been declared (explicitly, in an
<code>@interface</code> or <code>@protocol</code> declaration, or implicitly, in
an <code>@implementation</code> section) before the
<code>@selector(...)</code> expression. This option always performs its
checks as soon as a <code>@selector(...)</code> expression is found
(while <code>-Wselector</code> only performs its checks in the final stage of
compilation), and so additionally enforces the coding style convention
that methods and selectors must be declared before being used.
</dl>
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