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I'm trying to use an interface the following interface, which is declared in <Project Directory>/OtterMCU.srcs/sources_1/new/BranchPredictor.sv like so:

import Types::*;  // a package that provides the func3_t enum
interface BranchPredictor(
    input clk,
    input reset
    logic id_is_branch;
    func3_t id_branch_type;
    logic [31:0] id_pc;
    logic ex_branched;
    func3_t ex_branch_type;
    logic [31:0] ex_pc;
    logic should_branch;
    modport Predictor(
        input id_is_branch,
        input id_branch_type,
        input id_pc,
        input ex_branched,
        input ex_branch_type,
        input ex_pc,
        output should_branch
    modport ID(
        output id_is_branch,
        output id_branch_type,
        output id_pc,
        input should_branch
    modport EX(
        output ex_branched,
        output ex_branch_type,
        output ex_pc
endinterface 
When I use it in another module, Vivado gives an undeclared type error:
[Synth 8-3892] undeclared type 'BranchPredictor'  ["<redacted>/OtterMCU.srcs/sources_1/new/OTTER_MCU.sv":78]
Here's how it's used in a module (filename <Project Directory>/OtterMCU.srcs/sources_1/new/OTTER_MCU.sv):
module OTTER_MCU(/*...*/);
    // ...
    BranchPredictor ibpred();  // this is the offending line
    // ...
    IDStage id_stage(
        .predictor(ibpred.ID),  // this module uses one of the modports
        // ...
    // ...
endmodule
What am I doing wrong?
                This is a Vivado specific problem. The order of compilation of modules and interfaces should not matter
– dave_59
                Mar 3, 2021 at 2:16
        
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