3 IAR Extended Keywords

This section shows a summary of IAR extended keywords and the best MPLAB XC8 replacement where that is available. These keywords and their MPLAB XC8 equivalents are discussed in more detail in the sections that follow. It is recommended that you compare the relevant sections in the MPLAB® XC8 C Compiler User's Guide for AVR MCUs with those in your IAR C/C++ Compiler User Guide to ensure that migrated code will work as expected in all situations.

Table 3-1. MPLAB XC8 Equivalents to IAR Extended Keywords
IAR Keyword (links to explanatory section)	Suggested MPLAB XC8 Migration
`__eeprom`	Combined use of the `EEMEM` attribute and EEPROM-access functions
`__ext_io`	Use the `address` attribute
`__far`	No simple migration recommended
`__farflash`	Use either the`__memx` or `__flashn` qualifier
`__farfunc`	Remove the keyword
`__flash`	No migration necessary
`__generic`	Use the `__memx` qualifier
`__huge`	No simple migration recommended
`__hugeflash`	Either remove the keyword or use the `__memx` qualifier, based on the const-in-program-memory feature setting
`__interrupt`	Use the `__interrupt(number)` specifier
`__io`	Use one of the `io(n)`, `io_low(n)`, or `address(n)` attributes
`__monitor`	No simple migration recommended.
`__near`	Remove the keyword
`__nearfunc`	Remove the keyword
`__nested`	Use the `interrupt` attribute as well as the `__interrupt(n)` specifier
`__no_alloc, __no_alloc16`	No simple migration recommended
`__no_alloc_str, __no_alloc_str16`	No simple migration recommended
`__no_init`	Use the `__persistent` specifier or `persistent` attribute
`__no_runtime_init`	No simple migration recommended
`__noreturn`	No simple migration recommended
`__raw`	Consider the `naked` attribute
`__regvar`	Use the `asm("reg")` syntax and `register` keyword
`__ro_placement`	Remove the keyword when using the const-data-in-program-memory feature; otherwise, use the `__memx` qualifier
`__root`	No simple migration recommended
`__task`	No simple migration recommended
`__tiny`	Remove the keyword
`__tinyflash`	Use the `__flash` specifier
`__version1`, `__version2`,`__version4`	No simple migration recommended
`__x`, `__x_z`, `__z`, `__z_x`	No simple migration recommended