arm/ios crash

[subtly]

When running on arm/ios, secp256k1_start() fails with assertion:
#4 0x0002878a in secp256k1_num_mod_inverse at /path/secp256k1/impl/num_gmp.h:134
#5 0x00028516 in secp256k1_fe_inv_var at /path/secp256k1/impl/field.h:138
#6 0x0002691e in secp256k1_ge_set_gej at /path/secp256k1/impl/group.h:58
#7 0x00025f3e in secp256k1_ecmult_start at /path/secp256k1/impl/ecmult.h:89
#8 0x00025db0 in secp256k1_start at /path/secp256k1/secp256k1.c:22

Assertion fails in secp256k1_num_mod_inverse():
mp_size_t sn = NUM_LIMBS+1;
mp_size_t gn = mpn_gcdext(g, r->data, &sn, u, m->limbs, v, m->limbs);
assert(gn == 1); <==

Compiled with std=gnu99, USE_NUM_GMP, USE_FIELD_GMP, and USE_FIELD_INV_NUM.

What's the significance of USE_FIELD_INV_NUM and Field settings? Any thoughts on compile settings for arm?

[sipa]

Can you try building with --with-bignum=openssl? Perhaps there is a bug in the GMP library, or an incompatibility with the version.

[subtly]

Thanks for the suggestion. I'll give that a try next week.

[sipa]

Did you call secp256k1_start()?

[subtly]

Probably the issue. Can close for now -- hope to have plenty of testing and questions in the future ;)