gmp_randinit_set(b, a); gmp_randseed_ui(b, 123456); /* crashes */ AFAICT this is a gmp bug, but I don't rule out the possibility that it's a user bug. This looks like a GMP bug.
I never looked properly through the GMP PRNG code, and looking at it now I don't immediately understand its structure. (This code was written by an external contributor.) What happens with your code is that GMP tries to call a seed application function through a pointer, but that pointer was explicitly zeroed by gmp_randinit_set (or in __gmp_randiset_mt to be exact). One can change Mersenne_Twister_Generator_Noseed to Mersenne_Twister_Generator to fix this (and move __gmp_randiset_mt to randmts.c as mandated by Mersenne_Twister_Generator's scope), and then your code supposedly runs without a crash. But I don't see why one ever wants Mersenne_Twister_Generator_Noseed, which suggests my understanding of this code is very poor indeed. -- Torbjörn Please encrypt, key id 0xC8601622 _______________________________________________ gmp-bugs mailing list gmp-bugs@gmplib.org https://gmplib.org/mailman/listinfo/gmp-bugs