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1.5 Compiler Flags
Compiler flags are options you give to gcc when it compiles a file or set of files. You may provide these directly on the command line, or your development tools may generate them when they invoke gcc. This section describes just the flags that are specific to Objective-C.
Tells the compiler to create an instance of ClassName for each string literal expressed with the @"string" directive. For the GNU runtime, the default class is NXConstantString; for Cocoa it is NSConstantString.
-fgnu-runtime
Generate code for linking with the standard GNU Objective-C runtime. This is the default option for most gcc installations.
-fnext-runtime
Generate code for linking with the NeXT runtime. This is the default option for Darwin.
-gen-decls
Write all interface declarations the compiler sees 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 there are methods with the same name but different signatures.
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