Incorrect error location in edger8r messages

Given the following foo.edl:
enclave {
trusted {
// line 3
// line 4
public_typo void foo();
};
};

$ sgx_edger8r foo.edl
error: foo.edl:3:23: unexpected token: void

The error is reported on 3rd line where as the error is actually in the 5th line.
Investigation reveals that comments are being stripped out using GCC as a pre-processor in
https://github.com/intel/linux-sgx/blob/master/sdk/edger8r/linux/Preprocessor.ml#L58