23.7 Pragmas

Pragmas may be used by a compiler to control code generation. Any compiler will ignore an unknown pragma, but many pragmas implemented by another compiler have also been implemented by the MPLAB XC16, MPLAB XC-DSC and MPLAB XC32 C compilers in compatibility mode. The table below shows the pragmas and the level of support when using each of these MPLAB XC C compilers.

Many of these pragmas take arguments. Even if a pragma is supported by an MPLAB XC C compiler, this support may not apply to all of the pragma’s arguments. This is indicated in the following table.

Table 23-7. Support for Non-Standard Pragmas
IAR Compatibility Mode
Pragma	XC16	XC-DSC	XC32
`bitfields`	ignore	ignore	ignore
`data_alignment`	support	support	support
`diag_default`	ignore	ignore	ignore
`diag_error`	ignore	ignore	ignore
`diag_remark`	ignore	ignore	ignore
`diag_suppress`	ignore	ignore	ignore
`diag_warning`	ignore	ignore	ignore
`include_alias`	ignore	ignore	ignore
`inline`	support (no args)	support (no args)	support (no args)
`language`	ignore	ignore	ignore
`location`	support	support	support
`message`	native support	native support	native support
`object_attribute`	ignore	ignore	ignore
`optimize`	native support	native support	native support
`pack`	native support	native support	native support
`__printf_args`	support	support	support
`required`	support	support	support
`rtmodel`	ignore	ignore	ignore
`__scanf__args`	support	support	support
`section`	support	support	support
`segment`	support	support	support
`swi_number`	ignore	ignore	ignore
`type_attribute`	ignore	ignore	ignore
`weak`	native support	native support	native support