Cargo Features

[dependencies]
odbc-ffi = { version = "0.2.4", default-features = false, features = ["odbc_version_4", "odbc_version_3_50", "odbc_version_3_80"] }
default = odbc_version_3_80

The odbc_version_3_80 feature is set by default whenever odbc-ffi is added without default-features = false somewhere in the dependency tree.

odbc_version_4 = odbc_version_3_80

Affects attributes::SQL_OV_ODBC4

odbc_version_3_50 odbc_version_3_80
odbc_version_3_80 default odbc_version_4? = odbc_version_3_50

Affects attributes::SQL_OV_ODBC3_80