The preprocessor function __option() lets you test the setting of many pragmas and options that control the C/C++ compiler and code generation. You typically modify these settings using various panels in the Project Settings dialog box.

The syntax for this preprocessor function is:

If the specified option is on, __option() returns 1; otherwise, it returns 0. If option-name is unrecognized, __option() returns false.

This function is useful when you want one source file to contain code that uses different option settings. The example below shows how to compile one series of lines if you're compiling for machines with the MC68881 floating-point unit and another series if you're compiling for machines without out:

#if __option (code68881)  // Code for 68K chip with FPU
#else
  // Code for any 68K processor
#endif

The table below lists all the option names you can use in the preprocessor function __option().  

This argument...	Corresponds to the
a6frames	Generate A6 Stack Frames option in the 68K Linker settings panel and pragma a6frames.
align_array_members	Pragma align_array_members.
always_inline	Pragma always_inline.
altivec_codegen	Pragma altivec_codegen
altivec_model	Pragma altivec_model
altivec_vrsave	Pragma altivec_vrsave
ANSI_strict	ANSI Strict option in the C/C++ Language Panel and pragma ANSI_strict.
arg_dep_lookup	Pragma arg_dep_lookup.
ARM_conform	ARM Conformance option in the C/C++ Language Panel and pragma ARM_conform.
auto_inline	Auto-Inline option of the Inlining menu in the C/C++ Language Panel and pragma auto_inline.
bool	Enable C++ bool/true/false option in the C/C++ Language Panel and pragma bool.
check_header_flags	Pragma check_header_flags.
code68020	68020 Codegen option in the 68K Processor settings panel and pragma code68020.
code68881	68881 Codegen option in the 68K Processor settings panel and pragma code68881.
cplusplus	Whether the compiler is compiling this file as a C++ file. Related to the Activate C++ Compiler option in the C/C++ Language Panel, the pragma cplusplus, and the macro cplusplus
cpp_extensions	Pragma cpp_extensions
d0_pointers	Pragmas pointers_in_D0 and pointers_in_A0.
def_inherited	Pragma def_inherited.
defer_codegen	Pragma defer_codegen.
direct_destruction	Enable Exception Handling option in the C/C++ Language Panel and pragma direct_destruction.
direct_to_SOM	Direct to SOM menu in the C/C++ Language Panel and pragma direct_to_SOM
disable_registers	Pragma disable_registers.
dollar_identifiers	Pragma dollar_identifiers.
dont_inline	Don't Inline option in the C/C++ Language Panel and pragma dont_inline.
dont_reuse_strings	Don't Reuse Strings option in the C/C++ Language Panel and pragma dont_reuse_strings.
ecplusplus	Pragma ecplusplus
EIPC_EIPSW	Pragma EIPC_EIPSW
enumsalwaysint	Enums Always Int option in the C/C++ Language Panel and pragma enumsalwaysint
exceptions	Enable C++ Exceptions option in the C/C++ Language Panel and pragma exceptions
export	Pragma export.
extended_errorcheck	Extended Error Checking option in the C/C++ Warnings settings panel and pragma extended_errorcheck.
far_data	Far Data option in the 68K Processor settings panel and pragma far_data.
far_strings	Far String Constants option in the 68K Processor settings panel and pragma far_strings.
far_vtables	Far Method Tables in the 68K Processor settings panel and pragma far_vtables.
faster_pch_gen	Pragma faster_pch_gen.
float_constants	Pragma float_constants
force_active	Pragma force_active.
fourbyteints	4-Byte Ints option in the 68K Processor settings panel and pragma fourbyteints.
fp_contract	Use FMADD & FMSUB option in the PPC Processor settings panel and pragma fp_contract.
fullpath_prepdump	Pragma fullpath_prepdump.
function_align	Pragma function_align.
gcc_extensions	Pragma gcc_extensions.
IEEEdoubles	8-Byte Doubles option in the 68K Processor settings panel and pragma IEEEdoubles.
ignore_oldstyle	Pragma ignore_oldstyle.
import	Pragma import.
inline_bottom_up	Pragma inline_bottom_up.
inline_intrinsics	Pragma inline_intrinsics.
internal	Pragma internal.
interrupt	Pragma interrupt.
k63d	K6 3D Favored option in the Extended Instruction Set menu of the x86 CodeGen settings panel and pragma k63d.
k63d_calls	MMX + K6 3D option in the Extended Instruction Set menu of the x86 CodeGen settings panel and pragma k63d_calls.
lib_export	Pragma lib_export.
line_prepdump	Pragma line_prepdump.
little_endian	No option. It is 1 if you're compiling for a little endian target (such as x86) and 0 if you're compiling for a big endian target (such as Mac OS).
longlong	Pragma longlong.
longlong_enums	Pragma longlong_enums.
longlong_prepval	Pragma longlong_enums.
no_static_dtors	Pragma no_static_dtors.
macsbug	MacsBug Symbols option in the 68K Linker settings panel and pragma macsbug.
microsoft_exceptions	Pragma microsoft_exceptions.
microsoft_RTTI	Pragma microsoft_RTTI.
mmx	MMX option in the Extended Instruction Set menu of the x86 CodeGen settings panel and pragma mmx.
mmx_call	Pragma mmx_call.
mpwc	MPW C Calling Conventions option in the 68K Processor settings panel and pragma mpwc.
mpwc_newline	Map Newlines to CR option in the C/C++ Language Panel and pragma mpwc_newline.
mpwc_relax	Relaxed Pointer Type Rules option in the C/C++ Language Panel and pragma mpwc_relax.
no_register_coloring	Global Register Allocation option in the 68K Processor settings panel and pragma no_register_coloring.
oldstyle_symbols	MacsBug Symbols option in the 68K Linker settings panel and pragma oldstyle_symbols
only_std_keywords	ANSI Keywords Only option in the C/C++ Language Panel and pragma only_std_keywords.
opt_common_subs	Pragma opt_common_subs.
opt_dead_assignments	Pragma opt_dead_assignments.
opt_dead_code	Pragma opt_dead_code.
opt_lifetimes	Pragma opt_lifetimes.
opt_loop_invariants	Pragma opt_loop_invariants.
opt_propagation	Pragma opt_propagation.
opt_strength_reduction	Pragma opt_strength_reduction.
opt_strength_reduction_strict	Pragma opt_strength_reduction_strict.
opt_unroll_loops	Pragma opt_unroll_loops.
opt_vectorize_loops	Pragma opt_vectorize_loops.
pool_data	Pool Data option in the PPC Processor (for embedded PowerPC programming only) and pragma pool_data
pool_strings	Pool Strings option in the C/C++ Language Panel and pragma pool_strings
ppc_unroll_speculative	Pragma ppc_unroll_speculative.
precompile	Whether the file is being pre-compiled.
preprocess	Whether the file is being pre-processed
profile	Generate Profiler Calls option in the 68K Processor settings panel, Emit Profiler Calls option in the PPC Processor settings panel, and pragma profile.
readonly_strings	Make String Literals Readonly option in the PPC Processor settings panel and pragma readonly_strings.
register_coloring	Pragma register_coloring.
require_prototypes	Require Function Prototypes option in the C/C++ Language Panel and pragma require_prototypes.
RTTI	Enable RTTI option in the C/C++ Language Panel and pragma RTTI.
side_effects	Pragma side_effects.
simple_prepdump	Pragma simple_prepdump
SOM-Call-Optimization	Pragma SOM-Call-Optimization
SOMCheckEnvironment	Direct to SOM menu in the C/C++ Language Panel and pragma SOMCheckEnvironment
static_inlines	Pragma static_inlines
stack_cleanup	Pragma stack_cleanup.
suppress_init_code	Pragma suppress_init_code.
suppress_warnings	Pragma suppress_warnings.
sym	Marker in the project window debug column and pragma sym
syspath_once	Pragma syspath_once.
toc_data	Store Static Data in TOC option in the PPC Processor settings panel and pragma toc_data
traceback	Pragma traceback.
trigraphs	Expand Trigraphs option in the C/C++ Language Panel and pragma trigraphs.
unsigned_char	Use Unsigned Chars option in the C/C++ Language Panel and pragma unsigned_char.
use_fp_instructions	Use V810 Floating-Point Instructions, which is part of the NEC V800 Processor and pragma use_fp_instructions.
use_frame	Pragma use_frame.
use_mask_registers	Use r20 and r21 as Mask Registers, which is part of the NEC V800 Processor and pragma use_mask_registers.
warn_emptydecl	Empty Declarations option in the C/C++ Warnings settings panel and pragma warn_emptydecl.
warn_extracomma	Extra Commas option in the C/C++ Warnings settings panel and pragma warn_extracomma.
warn_hidevirtual	Hidden virtual functions option in the C/++ Warnings settings panel and pragma warn_hidevirtual.
warn_illegal_instructions	Pragma warn_illegal_instructions.
warn_illpragma	Illegal Pragmas option in the C/C++ Warnings settings panel and pragma warn_illpragma.
warn_implicitconv	Implicit Arithmetic Conversions option in the C/C++ Warnings settings panel and pragma warn_implicitconv.
warn_no_side_effect	pragma warn_no_side_effect
warn_notinlined	Non-Inlined Functions option in the C/C++ Warnings settings panel and pragma warn_notinlined.
warn_padding	pragma warn_padding
warn_possunwant	Possible Errors option in the C/C++ Warnings settings panel and pragma warn_possunwant.
warn_resultnotused	pragma warn_resultnotused
warn_structclass	Inconsistent Use of `class' and `struct' Keywords option in the C/C++ Warnings settings panel and pragma warn_structclass.
warn_unusedarg	Unused Arguments option in the C/C++ Warnings settings panel and pragma warn_unusedarg.
warn_unusedvar	Unused Variables option in the C/C++ Warnings settings panel and pragma warn_unusedvar.
warning_errors	Treat Warnings As Errors option in the C/C++ Warnings settings panel and pragma warning_errors.
wchar_type	Enable wchar_t Support option in the C/C++ Language settings panel and pragma wchar_type.