Compiler Option: -z - FreeBASIC Wiki Manual | FBWiki

Miscellaneous compiler option.

Specifies that the setjmp/longjmp implementation of Gosub should be used even when the GAS backend is used. By default, Gosub will be supported in -gen gas using CALL/RET assembly instructions and in -gen gcc using setjmp/longjmp C runtime functions.

Specifies that the implementation of cva_list variable argument lists and macros for variadic procedures should use a normal pointer type if the target supports it. By default, cva_list data types are mapped to gcc's __builtin_va_list data type when using -gen gcc.

Instructs fbc to ignore __thiscall directives in source files.

Instructs fbc to ignore __fastcall directives in source files.

Instructs fbc to link with the libfbrt[mt].a library instead of the libfb[mt].a library rather than having to copy or move files around or have multiple development directories.

Instructs fbc to ignore all cmdline directives in source file and take control from the real compiler command line only.

Instructs fbc to enable returning some structures (types) in floating point registers.

Instructs fbc to disable all builtin declarations and definitions except those that are strictly necessary to initialize the compiler to a working state when it can begin to parse user code. The user code must then supply all of the required declarations and definitions needed by fbc internals to allow compilation of user code to succeed. Note well that using this option requires knowledge of the internal workings of the compiler. For experimentation and development this allows declaring and defining nearly all fbc builtins in fb user code. The actual user code declarations required will depend on the contents of the user code to be compiled. fbc is expected to throw an error if the required supporting declarations or definitions have not been made before they are required by fbc itself while parsing the user source code (fbc may also crash instead).

Instructs fbc not to emit unused pure abstract types.