2 compilations with exactly same source code generates very differents binaries images

carlessolegrau
Posts: 3
Joined: Tue Jun 22, 2021 12:54 pm

2 compilations with exactly same source code generates very differents binaries images

Postby carlessolegrau » Wed Dec 01, 2021 12:34 am

Hi everyone,
I have detected that if I compile multiple time the exactly same source code, the resulting binaries sometimes are almost the same (just the compilation date/time is different and some CRC at the end), but sometimes the generated images are very different.

Has anyone knows why they are so different? I would like to make sure that they are almost the same because it is easier to prove that the source code has not been changed.

1) Minimal changes that I understant
1_almostequal_datetime.png
1_almostequal_datetime.png (308.21 KiB) Viewed 1277 times
2_almostequal_finalCRC.png
2_almostequal_finalCRC.png (23.45 KiB) Viewed 1277 times

2) Big fragment that is very different
3_verydifferent.png
3_verydifferent.png (267.2 KiB) Viewed 1277 times
Thanks,

Carles

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