jarin@plechac:~/storage/main/TMP$ echo "void main (void){while (1);}" > file.c
jarin@plechac:~/storage/main/TMP$ /opt/microchip/xc8/v1.33/bin/xc8 --mode=free --chip=16F1825 file.c
Microchip MPLAB XC8 C Compiler (Free Mode) V1.33
Part Support Version: 1.33 (A)
Copyright (C) 2014 Microchip Technology Inc.
License type: Node Configuration

(1273) Omniscient Code Generation not available in Free mode (warning)

Memory Summary:
    Program space        used     9h (     9) of  2000h words   (  0.1%)
    Data space           used     2h (     2) of   400h bytes   (  0.2%)
    EEPROM space         used     0h (     0) of   100h bytes   (  0.0%)
    Data stack space     used     0h (     0) of   320h bytes   (  0.0%)
    Configuration bits   used     0h (     0) of     2h words   (  0.0%)
    ID Location space    used     0h (     0) of     4h bytes   (  0.0%)


Running this compiler in PRO mode, with Omniscient Code Generation enabled,
produces code which is typically 40% smaller than in Free mode.
See http://microchip.com for more information.

jarin@plechac:~/storage/main/TMP$ ls
file.as   file.cof  file.hxl  file.sdb  l.obj       startup.lst
file.c    file.d    file.p1   file.sym  main.c~     startup.obj
file.cmf  file.hex  file.pre  funclist  startup.as  startup.rlf
jarin@plechac:~/storage/main/TMP$ cat file.hex
:08000000803102288731FC2F3A
:0A0FF600FB2F7E1020008731FB2F37
:00000001FF
jarin@plechac:~/storage/main/TMP$