Here is the info needed to remove restrictions on the GPL licensed XC8-AVR compiler

This is done on a Linux pc, so only refers to the Linux version.


change data at file offset specified for the 3 files cc1,cc1plus,lto1

objdump will show the global var virtual addresses, and the .data section virtual address
is used to figure out where the vars are located in the file-
virtual var address - virtual section base address + section file offset = var file offset

The vars and what they do can be found in the gpl source code available from microchip.

This example is for version 2.20 and and the same method will work for later versions also (until they
change their methods). Earlier versions did not use global variables so another method was used which 
was a little more difficult as you needed to modify the code instead.

==cc1==

objdump -T cc1 | grep license_valid

00000000017fe880 g    DO .data  0000000000000008  Base        mchp_xccov_license_valid
00000000017fe878 g    DO .data  0000000000000008  Base        mchp_avr_license_valid

objdump -h cc1 | grep " .data "

25 .data         000086f0  00000000017f6860  00000000017f6860  011f6860  2**5

cc1-
0x17fe878 - 0x17f6860 = 0x8018  +011f6860 = file offset 0x11fe878 - change FFFFFFFFFFFFFFFF to 0200000000000000
0x17fe880 - 0x17f6860 = 0x8020  +011f6860 = file offset 0x11fe880 - change FFFFFFFFFFFFFFFF to 0900000000000000



==cc1plus==

objdump -T cc1plus | grep license_valid

0000000001985980 g    DO .data  0000000000000008  Base        mchp_xccov_license_valid
0000000001985978 g    DO .data  0000000000000008  Base        mchp_avr_license_valid

objdump -h cc1plus | grep " .data "

 25 .data         000087d0  000000000197d880  000000000197d880  0137d880  2**5

cc1plus-
0x1985978 - 0x197d880 = 80F8  +0x137d880 = file offset 0x1385978 - change FFFFFFFFFFFFFFFF to 0200000000000000
0x1985980 - 0x197d880 = 8100  +0x137d880 = file offset 0x1385980 - change FFFFFFFFFFFFFFFF to 0900000000000000



==lto1==

objdump -T lto1 | grep license_valid

0000000001713660 g    DO .data  0000000000000008  Base        mchp_xccov_license_valid
0000000001713658 g    DO .data  0000000000000008  Base        mchp_avr_license_valid


objdump -h lto1 | grep " .data "

25 .data         000083d0  000000000170b960  000000000170b960  0110b960  2**5

lto1-
0x1713658 - 0x170b960 = 7CF8  +0x110b960 = file offset 0x1113658 - change FFFFFFFFFFFFFFFF to 0200000000000000
0x1713660 - 0x170b960 = 7D00  +0x110b960 = file offset 0x1113660 - change FFFFFFFFFFFFFFFF to 0900000000000000



Version 2.31 - Windows

from FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
to   02 00 00 00 00 00 00 00 09 00 00 00 00 00 00 00
file        offset
cc1.exe     0xC98648
cc1plus.exe 0xDC03A8
lto1.exe    0xC10CA8