Macro_fail: compile error on Zero (and probably other platforms)

Solved
12

I’ve moved over to a Zero so I don’t take down my server. This code replicates the problem seen on different platforms and produces the compile errors below (code follows). Moving the macro below the #include <BlynkSimpleEthernet2.h>
solves the problem, but that’s a band-aid. On larger projects this can cause problems if multiple libraries start having precedence requirements.

Macro_fail:29: error: variable or field 'BlynkWidgetWrite8' declared void
 BLYNK_WRITE(V8){
                                                           ^
Macro_fail:29: error: 'BlynkReq' was not declared in this scope
 BLYNK_WRITE(V8){
                        ^
Macro_fail:29: error: expected primary-expression before 'const'
 BLYNK_WRITE(V8){
                                                                       ^
exit status 1
variable or field 'BlynkWidgetWrite8' declared void

-- 

The example code
#define RANDOM_MACRO(mode) int empty_function(void) { return (int) (mode); }

#include <SPI.h>
#include <Ethernet2.h>

RANDOM_MACRO(5);  // CAUSES COMPILE ERROR IF IT'S HERE

#include <BlynkSimpleEthernet2.h>

// RANDOM_MACRO(5); // COMPILES IF ITS AFTER #include <BlynkSimpleEthernet2.h>

IPAddress ip(192,168,222, 120 );
const char auth[] = "authorization code";
byte mac[] = {  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
static IPAddress myDns(8,8,8,8);
IPAddress subnet_mask(255, 255, 255,   0);

void setup() {
  Blynk.begin(auth, "blynk-cloud.com", 8442, ip, myDns, mac);
}

void loop() {
  Blynk.run();
}

BLYNK_WRITE(V8){
    int pinValue = param.asInt(); // assigning incoming value from pin V2 to a variable
    Serial.print("V* button value is: ");
    Serial.println(pinValue);
}