Arduino-cli #pragma once problem

Projects Programming
1

I have 3 files in my Sketch directory:
Sketch.ino
Foo.h
Bar.h

Sketch.ino contains this:
#include "Foo.h"
void setup() {}
void loop() {}

Foo.h contains this:
#pragma once
#include "Bar.h"

Bar.h contains this:
#pragma once

Till now I used arduino-cli version 0.16.0 for building and everything was ok.
Now I moved to arduino-cli 0.28.0 and the build fails telling me this:

In file included from D:\Home\MyRepos\ChickenHouse\Sketch\Foo.h:2:0,
from D:\Home\MyRepos\ChickenHouse\Sketch\Sketch.ino:1:
D:\Home\MyRepos\ChickenHouse\Sketch\Bar.h:1:1: error: stray '\357' in program
#pragma once
^
D:\Home\MyRepos\ChickenHouse\Sketch\Bar.h:1:2: error: stray '\273' in program
#pragma once
^
D:\Home\MyRepos\ChickenHouse\Sketch\Bar.h:1:3: error: stray '\277' in program
#pragma once
^
D:\Home\MyRepos\ChickenHouse\Sketch\Bar.h:1:4: error: stray '#' in program
#pragma once
^
D:\Home\MyRepos\ChickenHouse\Sketch\Bar.h:1:5: error: 'pragma' does not name a type; did you mean '_Pragma'?
#pragma once
^~~~~~
_Pragma

Does anybody know why the newer version has problem with #pragma once or what's going on?

2

I think this could be your problem:

3

That's it! BOM. I completely forgot about this little hidden beast. One of my headers really has the BOM at the beginning. I have no idea how it got there. Now I wonder why the new arduino-cli can't handle it while the old one can. Weird.
Anyway, thank you very much for solving this puzzle.

4

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