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(gcc-300.info)Objective-C Dialect Options

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Options Controlling Objective-C Dialect
=======================================

   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 `some_class.m' like this:

     gcc -g -fgnu-runtime -O -c some_class.m

In this example, only `-fgnu-runtime' is an option meant only for
Objective-C programs; you can use the other options with any language
supported by GCC.

   Here is a list of options that are _only_ for compiling Objective-C
programs:

`-fconstant-string-class=CLASS-NAME'
     Use CLASS-NAME as the name of the class to instantiate for each
     literal string specified with the syntax `@"..."'.  The default
     class name is `NXConstantString'.

`-fgnu-runtime'
     Generate object code compatible with the standard GNU Objective-C
     runtime.  This is the default for most types of systems.

`-fnext-runtime'
     Generate output compatible with the NeXT runtime.  This is the
     default for NeXT-based systems, including Darwin and Mac OS X.

`-gen-decls'
     Dump interface declarations for all classes seen in the source
     file to a file named `SOURCENAME.decl'.

`-Wno-protocol'
     Do not warn if methods required by a protocol are not implemented
     in the class adopting it.

`-Wselector'
     Warn if a selector has multiple methods of different types defined.