Quartus

VHDL Entity Declaration warning at <location>: primary unit already exists -- overwriting existing primary unit with new primary unit

CAUSE: In an Entity Declaration at the specified location in a VHDL Design File (.vhd), you declared a primary unit for a physical type. However, you already declared the primary unit in a different Entity Declaration for the same physical type. As a result, Integrated Synthesis replaced the existing primary unit with the new primary unit.
ACTION: If you do not want Integrated Synthesis to overwrite the existing primary unit, or to avoid receiving this message in the future, change the new primary unit so it has a unique name.

See also:

Section 1.1 of the IEEE Std 1076-1993 IEEE Standard VHDL Language Reference Manual

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