So I am aware to an extent that this is a problem which has come up before and there has not been much interest in fixing it, but it seemed like I should at least ask. Here's the test case which I did in platformio, though the arduino ide emits an equivalent error message. void setup() {} typedef s…

Oh god no, git hub brings me out in a rash :confused:

I don't think the staff would read your post here, sometimes they do ( @pert for example)

[image] drillinstructorjan: it causes really incredibly large and complicated problems for people with a codebase they have been working on for a while, and which for whatever reason then ends up creating this issue. Time to start using .h and .cpp files to organise big sketches :wink: In ca…

That is ultimately what we've done, but it was quite a large refactoring effort and we are not very sure what long term risks it creates. We found the most straightforward way to do it was to move related chunks of code into .hpp files (tried .c and .cpp, which created problems of their own). There…

the issues are at compile time as you saw. so the "risk" is more that it does not compile rather than do something weird at run time

I get that, but in the end if we are working on it and it won't compile, then it still creates a big complicated problem for us, and we still can't finish the job, even if it's at compile time rather than run time.

sure I understand it's a nuisance and would love a check box in the preferences to skip that prototype generation step...

Another option I've seen is to simply create a function prototype yourself: void setup() {} typedef struct {uint8_t x;} structType; void myFunc(structType structInstance); void myFunc(structType structInstance){} void loop() {}

Yes I almost wrote a script to do that... But I think when you consider it, having to basically just repeat the first line of a function is a pretty insane workaround. I don't think anyone could really claim that's a beautiful solution :slight_smile:

It's fairly common practice outside of Arduino to have a block of function prototypes when there's a bunch of functions and you don't want to worry about who calls whom and which function comes before which other functions (especially when you have mutual recursion): void func1(int); void func2(int…

IDE reorders code using structs, enums?

Development Tools IDE 1.x

ptillisch August 26, 2023, 5:34am 23

It still does.

Code in the .h file is compiled according to the file extension of the file(s) that #include the header. A header file is never compiled as a standalone source file.

I see you opened a dedicated topic for that question:

Topic		Replies	Views
Programming in pure C Programming	44	250	May 5, 2026
Struct & function declaration order problem IDE 2.x	14	249	September 11, 2025
Prototype generation failure IDE 2.x	7	93	January 24, 2026
Arduino IDE compiler not recognising custom struct Programming	11	300	December 29, 2024
Arduino IDE is not the best choice IDE 2.x	44	427	March 22, 2026

IDE reorders code using structs, enums?

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