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TODO: get rid of gcc on darwin, we should use clang for native darwin builds.
```
cc/import.cpp: In function 'int32_t CheckCODAimport(CTransaction, CTransaction, std::vector<CTxOut>, std::string, std::string)':
cc/import.cpp:260:12: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
260 | out[65]='\0';
| ~~~~~~~^~~~~
cc/import.cpp:247:44: note: at offset 65 into destination object 'out' of size 65
247 | cJSON *result,*tmp,*tmp1; char *retstr,out[SHA256_DIGEST_LENGTH*2+1]; int i,n,m;
| ^~~
```
actually this is not needed, and the line out[64]='\0' could be commented,
as sprintf actually writes 3 bytes per call, i.e. for hash[i] = 0xca, it
will actually write the following sequence of bytes 'c', 'a', 0x00. So,
end of string will be always with end NUL byte.
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