Tabbed Sketches - Suggestion or How to

Development Tools IDE 2.x
32

Main ino file (1393854.demo1.ino)

struct ABC
{
  char a[20];
  int b;
  float c;
};

ABC abc = { "text", 3, PI };

void setup()
{
  Serial.begin(115200);
  printABC(abc);
}

void loop()
{
  // put your main code here, to run repeatedly:
}

Secondary ino file (functions1.ino)

void printABC(ABC x)
{
  Serial.println(x.a);
  Serial.println(x.b);
  Serial.println(x.c);
}

This compiles without problems. Now move setup() en loop() from the main ino file to the secondary file.

Main ino file (1393854.demo1.ino)

struct ABC
{
  char a[20];
  int b;
  float c;
};

ABC abc = { "text", 3, PI };

Secondary ino file (functions1.ino)

void printABC(ABC x)
{
  Serial.println(x.a);
  Serial.println(x.b);
  Serial.println(x.c);
}

void setup()
{
  Serial.begin(115200);
  printABC(abc);
}

void loop()
{
  // put your main code here, to run repeatedly:
}

This fails to compile

C:\Users\bugge\OneDrive\Documents\Arduino\1_forum.arduino.cc\1393854\1393854.demo1\functions1.ino:1:15: error: variable or field 'printABC' declared void
 void printABC(ABC x)
               ^~~
C:\Users\bugge\OneDrive\Documents\Arduino\1_forum.arduino.cc\1393854\1393854.demo1\functions1.ino:1:15: error: 'ABC' was not declared in this scope
C:\Users\bugge\OneDrive\Documents\Arduino\1_forum.arduino.cc\1393854\1393854.demo1\functions1.ino:1:15: note: suggested alternative: 'ADC'
 void printABC(ABC x)
               ^~~
               ADC
exit status 1

Compilation error: variable or field 'printABC' declared void

The ino.cpp file

#include <Arduino.h>
#line 1 "C:\\Users\\bugge\\OneDrive\\Documents\\Arduino\\1_forum.arduino.cc\\1393854\\1393854.demo1\\functions1.ino"
void printABC(ABC x);
#line 8 "C:\\Users\\bugge\\OneDrive\\Documents\\Arduino\\1_forum.arduino.cc\\1393854\\1393854.demo1\\functions1.ino"
void setup();
#line 14 "C:\\Users\\bugge\\OneDrive\\Documents\\Arduino\\1_forum.arduino.cc\\1393854\\1393854.demo1\\functions1.ino"
void loop();
#line 0 "C:\\Users\\bugge\\OneDrive\\Documents\\Arduino\\1_forum.arduino.cc\\1393854\\1393854.demo1\\functions1.ino"
#line 1 "C:\\Users\\bugge\\OneDrive\\Documents\\Arduino\\1_forum.arduino.cc\\1393854\\1393854.demo1\\1393854.demo1.ino"
struct ABC
{
  char a[20];
  int b;
  float c;
};

ABC abc = { "text", 3, PI };

#line 1 "C:\\Users\\bugge\\OneDrive\\Documents\\Arduino\\1_forum.arduino.cc\\1393854\\1393854.demo1\\functions1.ino"
void printABC(ABC x)
{
  Serial.println(x.a);
  Serial.println(x.b);
  Serial.println(x.c);
}

void setup()
{
  Serial.begin(115200);
  printABC(abc);
}

void loop()
{
  // put your main code here, to run repeatedly:
}

I do not have the understanding of the internals of the builder but I'm reasonably sure that I understand the idea behind it. I hope that I did not make a stupid mistake in above :wink:
When I encountered the issue it was in a sketch with far more ino files and they were "numbered" like main.ino, a_setup.ino, b_loop.ino etc. The above is a simple simulation.

Here is one that I'm aware of: Generated function prototype injected before declaration of custom parameter type · Issue #2696 · arduino/arduino-cli · GitHub. The builder can at occasion not even process a single ino file correctly. I've verified it just now.