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## 6. Predefined macros

The compiler defines several macros at startup:

`__CC65__`

  This macro is always defined. Its value is the version number of the compiler in hex. For example, version 2.10.1 of the compiler has this macro defined as `0x02A1`.

`__APPLE2__`

  This macro is defined if the target is the Apple ][ (-t apple2).

`__APPLE2ENH__`

  This macro is defined if the target is the enhanced Apple //e (-t apple2enh).

`__ATARI__`

  This macro is defined if the target is one of the Atari computers (400/800/130XL/800XL).

`__ATMOS__`

  This macro is defined if the target is the Oric Atmos (-t atmos).

`__CBM__`

  This macro is defined if the target system is one of the CBM targets.

`__C16__`

  This macro is defined if the target is the c16 (-t c16).

`__C64__`

  This macro is defined if the target is the c64 (-t c64).

`__C128__`

  This macro is defined if the target is the c128 (-t c128).

`__CBM510__`

  This macro is defined if the target is the CBM 500 series of computers.

`__CBM610__`

  This macro is defined if the target is one of the CBM 600/700 family of computers (called B series in the US).

`__GEOS__`

  This macro is defined if you are compiling for the GEOS system (-t geos).

`__LUNIX__`

  This macro is defined if you are compiling for the LUnix system (-t lunix).

`__LYNX__`

  This macro is defined if the target is the Atari Lynx (-t lynx).

`__NES__`

  This macro is defined if the target is the NES (-t nes).

`__PET__`

  This macro is defined if the target is the PET family of computers (-t pet).

`__PLUS4__`

  This macro is defined if the target is the plus/4 (-t plus4).

`__SUPERVISION__`

  This macro is defined if the target is the supervision (-t supervision).

`__VIC20__`

  This macro is defined if the target is the vic20 (-t vic20).

`__FILE__`

  This macro expands to a string containing the name of the C source file.

`__LINE__`

  This macro expands to the current line number.

`__CC65_STD__`

  This macro is defined to one of the following depending on the `--standard` command line option:

  - `__CC65_STD_C89__`
  - `__CC65_STD_C99__`
  - `__CC65_STD_CC65__`
`__OPT__`

  Is defined if the compiler was called with the `-O` command line option.

`__OPT_i__`

  Is defined if the compiler was called with the `-Oi` command line option.

`__OPT_r__`

  Is defined if the compiler was called with the `-Or` command line option.

`__OPT_s__`

  Is defined if the compiler was called with the `-Os` command line option.

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