> On 05 Jun 2016, at 16:08, Oleg Kolosov <[email protected]> wrote: > > >> On 05 Jun 2016, at 15:13, Kooda <[email protected]> wrote: >> >> Hello, >> >> I’ve been looking, in the past few days, at how to make CHICKEN >> produce C files deterministically. >> >> My goal here is to make it easier for package managers like Guix to >> ship CHICKEN, as well as help us see how compiler changes affect the >> generated output. I’m also highly interested in getting the same >> binaries each time I compile a CHICKEN project. >> >> So, here is a patch that does just that. I tried to make it as little >> as possible and may have missed a few things. >> >> The main problem was that the symbol hash table used a random seed, >> which made the symbol order in the C files random. That’s what the new >> deterministic-build unit addresses. >> >> The other main source of non-determinism was the mention of the build >> host and date at the top of the generated C files. I removed that >> entirely as it doesn’t seem really useful. >> >> I have left two identifiers untouched yet, unique-id in c-backend.scm >> and make-random-name in support.scm. Both use (current-seconds) which >> I want to remove. >> >> Though it seems unique-id isn’t used anywhere, can I remove it >> entirely? >> >> About make-random-name, would it be ok to just remove the >> current-seconds call or replace it with something else? >> >> I also changed the default `ar` invocation options to make it generate >> the same .a file each time it’s called with the same files, but sadly >> the deterministic option doesn’t exist on Apple computers. >> >> I hope all of this isn’t too messy. Please tell me what you think >> about this change, I don’t want to impose anything. >> >> If the change is accepted, I’ll make a new version of the patch and >> port everything to chicken-5 as soon as I know what to do with the >> remaining two identifiers. >> >> Thanks in advance! >> >> >> <0001-Make-CHICKEN-build-process-deterministic.patch>_______________________________________________ >> Chicken-hackers mailing list >> [email protected] >> https://lists.nongnu.org/mailman/listinfo/chicken-hackers > > Hello! > > Great news! I've tried to figure this out some time ago without much success. > But my goal was to make it compatible with ccache. > > I'm not familiar with code generator internals, can't review the patch, but > I'm interested in using this if there are no other unintended consequences. > > P.S. Looks like the deterministic-build.scm is empty in the attached file. > > -- > Regards, Oleg
I've tried it on 4.10 with ccache without luck - time and date in headers are gone but the names of CPS functions are still random. I've even replaced all calls to rand and srand with 0 in code just to be sure. Binary *.o files differ too. P.S. Ignore a bit about empty file in previous message - my error. -- Regards, Oleg _______________________________________________ Chicken-hackers mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/chicken-hackers
