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Questions tagged [linker]

In computing, a linker or link editor is a computer utility program that takes one or more object files generated by a compiler or an assembler and combines them into a single executable file, library file, or another 'object' file.

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Linker missing using Arduino IDE

I use the Arduino IDE 1.8.5 and it seems the linker disappeared. The error messages are: arm-none-eabi-g++: warning: {compiler.optimization_flags}: linker input file unused because linking not done\ ...
Techdoc's user avatar
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3 votes
1 answer
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override pinMode, digitalWrite and digitalRead

I am using the ESP32 Arduino Framework and I have some GPIO expanders attached via I²C. They work fine and I now want to map some unused pin numbers to them so I can used my custom pin numbers in ...
Ilka's user avatar
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1 answer
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Inconsistent behavior of include statements?

This question deals with fonts. Well, actually, singular include files with constants that form bitmap fonts or images for LCD or OLED displays, such as this one: https://github.com/ThingPulse/esp8266-...
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Undefined reference to function in custom library

Hello I am making a private Arduino library but am having trouble understanding how it is linked. Why does this h file work, but when I move the definition of board_led to a matching c file, it throws ...
Samuel Jenks's user avatar
-1 votes
1 answer
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Initializing an object as class member resulting in linking error?

I'm a little dumbfounded as to why this isn't working. I keep getting the following linker error: In file included from src\ac.cpp:1:0: src/ac.h:9:21: error: expected identifier before numeric ...
Jeebus's user avatar
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1 vote
1 answer
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Libraries are not linked

I created 4 libraries, each in .h and .cpp files, and tested them individually. I kept the project flexibility by defining 3 flags that allow or disallow the usage of the libraries. When integrating ...
user1511360's user avatar
1 vote
1 answer
308 views

Program size optimization

I am trying to spare a few bytes of program size. I faced a problem which I cannot understand and I hope somebody will help. Look at this empty sketch, pleas. It takes just 444 bytes: void setup() { } ...
zhekaus's user avatar
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2 votes
1 answer
3k views

ld.exe:linker_script.ld:138 cannot move location counter backwards | ArduinoFFT Error

Board: Arduino Nano 33 BLE Sense I'm pulling PCM data from an onboard microphone and running it through the arduinoFFT library (version 1.5.6) to obtain a spectrogram. Since the arduinoFFT library ...
Ben L's user avatar
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1 answer
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Splitting up code in multiple files causing `multiple definition` and `undefined reference` error

I have the following very basic program that reads MPU6050(accelerometer and gyroscope) sensor using the I2C library, and prints the sensor information. This program works as expected. #include <...
Quazi Irfan's user avatar
0 votes
1 answer
882 views

How to create large progmem arrays and not annoy the linker

I have a rather complex project (PlatformIO, but I've also had this happen in the vanilla IDE) with several nested includes. Let's say that there are three files and a main sketch. The main sketch ...
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1 vote
1 answer
555 views

cant figure out how to fix this compile error

evrything worked for a bit and changed to much to get it working again. dont really understand the error. [![C:\Users\bavob\AppData\Local\Temp\ccyfrkaL.ltrans0.ltrans.o: In function `loop': C:\Users\...
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