User forums > General (but related to Code::Blocks)
Undefined reference to main - first arduino project in code::blocks
Windy:
Hi there,
I got sick of the arduino IDE, so I decided to switch to codeblocks. I installe codeblocks 13.12 and the arduino plugin form scottdky on my ubuntu 14.04 machine. I quiet liked the idea of different compiler settings for debugging and finaly building a release and upload it. If I use my "debugging" settings, the code compiles allright. Unfortunately it failes if I use my "compile and upload" settings.
To test the settings I try to compile the example below. I set the project up using scottdky's arduino project wizard, although I changed several settings and search directories...
--- Code: ---#include <Arduino.h>
/*
Turns on an LED on for one second, then off for one second, repeatedly.
This example code is in the public domain.
*/
void setup()
{
// initialize the digital pin as an output.
pinMode(5, OUTPUT);
}
void loop()
{
digitalWrite(5, HIGH); // set the LED on
delay(1000); // wait for a second
digitalWrite(5, LOW); // set the LED off
delay(1000); // wait for a second
}
--- End code ---
Here the output if i use the debugging settings:
--- Code: ----------------- Build: Simulator - Debug in Test (compiler: GNU GCC Compiler for AVR)---------------
Scanned 0 files for #includes, cache used 0, cache updated 0
avr-g++ -Wall -fno-exceptions -ffunction-sections -fdata-sections -x c++ -s -DARDUINO=101 -DUSE_EEPROM=0 -DUSE_ETHERNET=0 -DUSE_FIRMATA=0 -DUSE_LCD=0 -DUSE_LCD4884=0 -DUSE_OBD=0 -DUSE_SD=0 -DUSE_SERVO=0 -DUSE_SOFTSERIAL=0 -DUSE_SPI=0 -DUSE_STEPPER=0 -DUSE_TINYGPS=0 -DUSE_WIRE=0 -g -DARDUSIM -DENABLE_API_NAME -D__AVR_ATmega2560__ -DF_CPU=16000000L -I../libraries/ArduinoHardware/arduino/avr/cores/arduino -I../libraries/ArduinoHardware/arduino/avr/variants/mega -I../libraries/ArduinoHardware/arduino/avr/libraries/Wire -c sketch.cpp -o obj/Debug/sketch.o
In file included from ../libraries/ArduinoHardware/arduino/avr/cores/arduino/USBAPI.h:27:0,
from ../libraries/ArduinoHardware/arduino/avr/cores/arduino/Arduino.h:226,
from sketch.cpp:1:
/usr/lib/avr/include/util/delay.h:95:3: warning: #warning "Compiler optimizations disabled; functions from <util/delay.h> won't work as designed" [-Wcpp]
# warning "Compiler optimizations disabled; functions from <util/delay.h> won't work as designed"
^
avr-g++ -o Test obj/Debug/sketch.o -Wl,--gc-sections
Output file is Test with size 17,37 KB
CWD for depslib was: /media/Data/Arduino_Workspace/Test.
CWD for depslib is: /media/Data/Arduino_Workspace/Test.
Scanned 0 files for #includes, cache used 0, cache updated 0
CWD for depslib was: /media/STICK/Daten/Hubschrauber/Eigenbau/Arduino_Workspace/Test.
CWD for depslib is: /media/Data/Arduino_Workspace/Test.
Scanned 0 files for #includes, cache used 0, cache updated 0
CWD for depslib was: /media/Data/Arduino_Workspace/Test.
CWD for depslib is: /media/Data/Arduino_Workspace/Test.
Scanned 0 files for #includes, cache used 0, cache updated 0
CWD for depslib was: /media/Data/Eigenbau/Arduino_Workspace/Test.
CWD for depslib is: /media/Data/Arduino_Workspace/Test.
Scanned 0 files for #includes, cache used 0, cache updated 0
CWD for depslib was: /media/Data/Arduino_Workspace/Test.
CWD for depslib is: /media/Data/Arduino_Workspace/Test.
Scanned 0 files for #includes, cache used 0, cache updated 0
Process terminated with status 0 (0 minute(s), 0 second(s))
0 error(s), 1 warning(s) (0 minute(s), 0 second(s))
--- End code ---
And here the output of my attempt using the "compile and upload" settings:
--- Code: ----------------- Build: Arduino Mega 2560/ADK in Test (compiler: GNU GCC Compiler for AVR)---------------
Scanned 0 files for #includes, cache used 0, cache updated 0
avr-g++ -Wall -fno-exceptions -ffunction-sections -fdata-sections -x c++ -s -DARDUINO=101 -DUSE_EEPROM=0 -DUSE_ETHERNET=0 -DUSE_FIRMATA=0 -DUSE_LCD=0 -DUSE_LCD4884=0 -DUSE_OBD=0 -DUSE_SD=0 -DUSE_SERVO=0 -DUSE_SOFTSERIAL=0 -DUSE_SPI=0 -DUSE_STEPPER=0 -DUSE_TINYGPS=0 -DUSE_WIRE=0 -Os -mmcu=atmega2560 -D__AVR_ATmega2560__ -DF_CPU=16000000L -DCODE_BLOCKS -I../libraries/ArduinoHardware/arduino/avr/cores/arduino -I../libraries/ArduinoHardware/arduino/avr/variants/mega -I../libraries/ArduinoHardware/arduino/avr/libraries/Wire -c sketch.cpp -o .objs/sketch.o
avr-g++ -o bin/Release/Test.elf .objs/sketch.o -Wl,--gc-sections -s -mmcu=atmega2560
/usr/lib/gcc/avr/4.8.2/../../../avr/lib/avr6/crtm2560.o: In Funktion `__bad_interrupt':
../../../../crt1/gcrt1.S:195: Undefined reference to `main'
collect2: error: ld returned 1 exit status
Process terminated with status 1 (0 minute(s), 0 second(s))
1 error(s), 0 warning(s) (0 minute(s), 0 second(s))
--- End code ---
Here the folder structure of /media/Data/Arduino_Workspace/. i got rid of most irrelevant folders...
--- Code: ---.
├── libraries
│ ├── ArduinoHardware
│ │ ├── arduino
│ │ │ └── avr
│ │ │ ├── boards.txt
│ │ │ ├── bootloaders
│ │ │ ├── cores
│ │ │ │ └── arduino
│ │ │ │ ├── abi.cpp
│ │ │ │ ├── Arduino.h
│ │ │ │ ├── binary.h
│ │ │ │ ├── CDC.cpp
│ │ │ │ ├── Client.h
│ │ │ │ ├── HardwareSerial0.cpp
│ │ │ │ ├── HardwareSerial1.cpp
│ │ │ │ ├── HardwareSerial2.cpp
│ │ │ │ ├── HardwareSerial3.cpp
│ │ │ │ ├── HardwareSerial.cpp
│ │ │ │ ├── HardwareSerial.h
│ │ │ │ ├── HardwareSerial_private.h
│ │ │ │ ├── HID.cpp
│ │ │ │ ├── hooks.c
│ │ │ │ ├── IPAddress.cpp
│ │ │ │ ├── IPAddress.h
│ │ │ │ ├── main.cpp
│ │ │ │ ├── new.cpp
│ │ │ │ ├── new.h
│ │ │ │ ├── Printable.h
│ │ │ │ ├── Print.cpp
│ │ │ │ ├── Print.h
│ │ │ │ ├── Server.h
│ │ │ │ ├── Stream.cpp
│ │ │ │ ├── Stream.h
│ │ │ │ ├── Tone.cpp
│ │ │ │ ├── Udp.h
│ │ │ │ ├── USBAPI.h
│ │ │ │ ├── USBCore.cpp
│ │ │ │ ├── USBCore.h
│ │ │ │ ├── USBDesc.h
│ │ │ │ ├── WCharacter.h
│ │ │ │ ├── WInterrupts.c
│ │ │ │ ├── wiring_analog.c
│ │ │ │ ├── wiring.c
│ │ │ │ ├── wiring_digital.c
│ │ │ │ ├── wiring_private.h
│ │ │ │ ├── wiring_pulse.c
│ │ │ │ ├── wiring_pulse.S
│ │ │ │ ├── wiring_shift.c
│ │ │ │ ├── WMath.cpp
│ │ │ │ ├── WString.cpp
│ │ │ │ └── WString.h
│ │ │ ├── firmwares
│ │ │ ├── libraries
│ │ │ │ ├── EEPROM
│ │ │ │ ├── SoftwareSerial
│ │ │ │ ├── SPI
│ │ │ │ └── Wire
│ │ │ ├── platform.txt
│ │ │ ├── programmers.txt
│ │ │ └── variants
│ │ │ ├── eightanaloginputs
│ │ │ ├── ethernet
│ │ │ ├── gemma
│ │ │ ├── leonardo
│ │ │ ├── mega
│ │ │ │ └── pins_arduino.h
│ │ │ ├── micro
│ │ │ ├── robot_control
│ │ │ ├── robot_motor
│ │ │ ├── standard
│ │ │ └── yun1
│ │ └── tools
└── Test
├── bin
│ └── Release
│ ├── Test.elf.eep.hex
│ └── Test.elf.hex
├── cores
│ ├── CDC.cpp
│ ├── HardwareSerial.cpp
│ ├── HID.cpp
│ ├── IPAddress.cpp
│ ├── main.cpp
│ ├── new.cpp
│ ├── Print.cpp
│ ├── Stream.cpp
│ ├── Tone.cpp
│ ├── USBCore.cpp
│ ├── WInterrupts.c
│ ├── wiring_analog.c
│ ├── wiring.c
│ ├── wiring_digital.c
│ ├── wiring_pulse.c
│ ├── wiring_shift.c
│ ├── WMath.cpp
│ └── WString.cpp
├── libraries
│ └── libraries.cpp
├── obj
│ ├── Debug
│ │ ├── cores
│ │ │ ├── CDC.o
│ │ │ ├── HardwareSerial.o
│ │ │ ├── HID.o
│ │ │ ├── IPAddress.o
│ │ │ ├── main.o
│ │ │ ├── new.o
│ │ │ ├── Print.o
│ │ │ ├── Stream.o
│ │ │ ├── Tone.o
│ │ │ ├── USBCore.o
│ │ │ ├── WInterrupts.o
│ │ │ ├── wiring_analog.o
│ │ │ └── wiring.o
│ │ ├── libraries
│ │ │ └── ArduinoHardware
│ │ │ └── arduino
│ │ │ └── avr
│ │ │ └── cores
│ │ │ └── arduino
│ │ │ └── main.o
│ │ ├── sketch.o
│ │ └── Test
│ │ └── sketch.o
│ └── Release
│ ├── cores
│ │ ├── CDC.o
│ │ ├── HardwareSerial.o
│ │ ├── HID.o
│ │ ├── IPAddress.o
│ │ ├── main.o
│ │ ├── new.o
│ │ ├── Print.o
│ │ ├── Stream.o
│ │ ├── Tone.o
│ │ ├── USBCore.o
│ │ ├── WInterrupts.o
│ │ ├── wiring_analog.o
│ │ └── wiring.o
│ ├── libraries
│ │ └── ArduinoHardware
│ │ └── arduino
│ │ └── avr
│ │ └── cores
│ │ └── arduino
│ │ └── main.o
│ ├── sketch.o
│ └── Test
│ └── sketch.o
├── sketch.cpp
├── Test
├── Test.cbp
├── Test.cbpbackup
├── Test.depend
└── Test.layout
--- End code ---
I compared the compiler options and search for ages but can't find the cause of the error. The function main is defined in ./libraries/ArduinoHardware/arduino/avr/cores/arduino/main.cpp. I tried to include the file itselfe (which might not make sense at all...), I declared main in a main.h and included the headerfile to the search path but with no success. I tried to definde main in my sketch.cpp befor defining setup() and loop () which didn't help either. Any ideas? What am I missing?
Thanks in advance!
Windy
stahta01:
Later today I will try and see if I can duplicate the problem under Debian 8.1 "Jessie"
I have no arduino hardware; so, I hope that is NOT needed to dup the problem.
Likely be using CB Nightly on first dup attempt.
Failed: To even get as far as your error using CB Nightly.
The error itself looks like a linking error to me.
Tim S.
Windy:
You don't need any arduino hardware...
Jap, that's a linking error. The "ld" after "error:" indicates that.
Windy
stahta01:
Could you attach the cbp file you are using for me to test that directly?
I believe you need to zip or 7zip it to attach it.
Tim S.
Windy:
cbp-File is attached.
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