Quote from: 100knot2dae on February 28, 2021, 11:00:32 AM

Try something like this:

Code:

diff --git a/cgminer.c b/cgminer.c
index ece7ce10..ab52e30a 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -2960,7 +2960,7 @@ static bool gbt_solo_decode(struct pool *pool, json_t *res_val)
flags = json_string_value(json_object_get(coinbase_aux, "flags"));
default_witness_commitment = json_string_value(json_object_get(res_val, "default_witness_commitment"));

- if (!previousblockhash || !target || !version || !curtime || !bits || !coinbase_aux || !flags) {
+ if (!previousblockhash || !target || !version || !curtime || !bits) {
applog(LOG_ERR, "Pool %d JSON failed to decode GBT", pool->pool_no);
return false;
}
@@ -3039,10 +3039,12 @@ static bool gbt_solo_decode(struct pool *pool, json_t *res_val)
ofs += ser_number(pool->scriptsig_base + ofs, height); // max 5

/* Followed by flags */
- len = strlen(flags) / 2;
- pool->scriptsig_base[ofs++] = len;
- hex2bin(pool->scriptsig_base + ofs, flags, len);
- ofs += len;
+ if (flags) {
+ len = strlen(flags) / 2;
+ pool->scriptsig_base[ofs++] = len;
+ hex2bin(pool->scriptsig_base + ofs, flags, len);
+ ofs += len;
+ }

/* Followed by timestamp */
cgtime(&now);

Compiles clean, and should work just fine. Didn't test myself, since not running a node.

Verified that works! Yay solo mining with newpacs on bitcoind v0.21! Thanks 100knot2dae!

Do you want to submit this patch to vh's cgminer? I can also do so if you'd like.