4 IAR Pragmas

This section shows a summary of IAR pragmas and the best MPLAB XC8 replacement where that is available. These pragmas 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 4-1. MPLAB XC8 Equivalents to IAR Pragmas
IAR Pragma (links to explanatory section)	Suggested MPLAB XC8 Migration
`CX_RANGE_LIMITED`	The pragma can be removed
`FENV_ACCESS`	The pragma can be removed
`FP_CONTRACT`	No simple migration recommended
`basic_template_matching`	No simple migration recommended
`bitfields`	No simple migration recommended
`call_graph_root`	No simple migration recommended
`calls`	No simple migration recommended
`constseg`	Use the `section` attribute
`data_alignment`	Use the `aligned` attribute
`dataseg`	Use the `section` attribute
`default_function_attributes`	Consider the `section` attribute
`default_variable_attributes`	Consider the `typedef` specifier and `section` attribute
`diag_xxxx`	No simple migration recommended
`error`	No simple migration recommended
`include_alias`	No simple migration recommended
`inline`	Use the `always_inline` or `noinline` attribute
`language`	No simple migration recommended
`location`	Use the `__at` specifier and `section` attribute
`message`	No simple migration recommended
`object_attribute`	Migrate individual attributes specified by this pragma
`optimize`	No simple migration recommended
`printf_args`	No simple migration recommended
`public_equ`	Use the `asm()` statement
`required`	No simple migration recommended
`rtmodel`	No simple migration recommended
`scanf_args`	No simple migration recommended
`segment`	The pragma can be removed
`type_attribute`	Migrate individual attributes specified by this pragma
`vector`	Use the `__interrupt(number)` specifier
`weak`	Use the `weak` function attribute