mozziAnalogRead() undefined reference in multi-source project

[koyoi]

In a multi-source project, when I include MozziHeadersOnly.h in a .cpp file and call mozziAnalogRead(), I get an undefined reference to error.

environment:
mozzi 2.0.2
board support: STM32 MCU based boards 2.11.0
Arduino IDE 2.3.6

[tomcombriat]

Hi,
Thanks for the report. Could you potentially provide a minimal non-working example displaying the error?
Also, which STM32 core are you using? MBED or Maple based one (see: https://sensorium.github.io/Mozzi/#supported-boards-output-modes-and-default-pins)?

[koyoi]

Hi tomcombriat,

I use this -> https://github.com/stm32duino

test.ino

#define MOZZI_ANALOG_READ_RESOLUTION 10
#include <Mozzi.h>

extern int hoge();

void setup(){
startMozzi();
}

void updateControl(){
int x = hoge();
}

AudioOutput updateAudio(){
return 0;
}

void loop(){
audioHook(); // required here
}

aaa.cpp

#define MOZZI_ANALOG_READ_RESOLUTION 12

#include <MozziHeadersOnly.h>

int hoge()
{
int fundamental = mozziAnalogRead(0)+1;
return fundamental;
}

---

[tfry-git]

Try using the same MOZZI_ANALOG_READ_RESOLUTION in all sources. In general you will have to make sure to use a consistent Mozzi config in a multi-source project.

If that does not help, could you post the exact error message?

[tomcombriat]

In addition to @tfry-git 's comment, try changing the extension of the second file to .ino instead of .cpp.

The latter shows the same problem here, but not the former, weirdly…

[koyoi]

Thanks for pointing out the need to unify MOZZI_ANALOG_READ_RESOLUTION.

Renaming aaa.cpp to aaa.ino resolved the error, and I was able to move forward with the project — thanks for that.

That said, I don’t think this is a fundamental fix. The build system merges all .ino files into a single .cpp before compiling, so the error disappears for that reason. If the second source file is also an .ino, then the mozzi_header only include isn’t needed at all...

Here’s the build error message when compiling the project consists of sketch_jul20a .ino and hoge .cpp : errmsg.txt

[tfry-git]

Glad you found a solution, but yes, this looks buggy, indeed.

For faster reference, the relevant error message:

C:\Users\koyoi\no_OneDrive\Arduino\sketch_jul20a\hoge.cpp: In function 'int hoge()':
C:\Users\koyoi\no_OneDrive\Arduino\sketch_jul20a\hoge.cpp:5:21: error: 'mozziAnalogRead' was not declared in this scope

Note: "not declared", rather than "not defined", so I suppose we may just fail to auto-include mozzi_analog.h, somehow.