Fatal error C1029

'filename': source file hash (number bytes) exceeds the IFC format's maximum supported hash size (number bytes); use a smaller hash algorithm such as SHA-256

Remarks

This error occurs when you compile a C++ module (or header unit) with a /ZH hash algorithm that produces a checksum larger than the current IFC format supports. The /ZH:SHA384 and /ZH:SHA512 options produce checksums that exceed this limit.

To fix this error, use /ZH:SHA_256 or a smaller hash algorithm (such as /ZH:SHA1 or /ZH:MD5) when you compile modules or header units. The default /ZH:SHA_256 option works correctly with IFC files.