3.8.1.4 XC8 C Compiler - General

Use subroutines for function prologues and epilogues

This option affects how functions save and restore registers on entry and exit. See Call-prologues Option.

Change the stack pointer without disabling interrupts

This option controls whether interrupts should be disabled when the stack pointer is changed. See No-interrupts Option.

Default char type is unsigned

This option controls the signedness used for a plain char. See Signed-char Option.

Default bitfield type is unsigned

This option controls the signedness used for a plain int bit-field. See Signed-char Option.

Use CCI

Selecting this option indicates that source code should conform to the Common C Interface. See Ext Option.