VS Arduino - Multiple Definition Error

Jun 20^th, 2025 at 5:52am (UTC)

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Multiple Definition Error (Read 2492 times)

DER_ANFÄNGER Newbies Offline Posts: 4 Joined: Oct 3^rd, 2015	Multiple Definition Error Oct 3^rd, 2015 at 5:57pm	Print Post
	Hey Guys, I have a very basic Problem but can't solve it myself. I want to use the I2CdevLib more accurate the file "MPU6050_6Axis_MotionApps20.h". so i have to include it to the .INO file,so the compiler "Knows" the file. but then i want also use the header in "Gyro.h". Now my Problem: If i include "MPU6050_6Axis_MotionApps20.h" in just the ino i get an not declaired Error. If i include it just into the "Gyro.h"i get an File not found Error. and if i include it into both i get an multiple definition Error so... what should i do ? :/


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Tim@Visual Micro Administrator Offline Posts: 12191 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Multiple Definition Error Reply #1 - Oct 3^rd, 2015 at 6:11pm	Print Post
	Hi, Does it work when you try it with the current release of the arduino ide (1.6.5-r2)? Thanks


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DER_ANFÄNGER Newbies Offline Posts: 4 Joined: Oct 3^rd, 2015	Re: Multiple Definition Error Reply #2 - Oct 3^rd, 2015 at 6:24pm	Print Post
	I usally use Visual Micro as IDE ... but i tried also the Arduino IDE (1.6.5 ) and it didn't worked. 1.6.5 r2 shouldn't be different because the only change was the problem that prevented opening the IDE when double clicking a .ino file... :/


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Tim@Visual Micro Administrator Offline Posts: 12191 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Multiple Definition Error Reply #3 - Oct 3^rd, 2015 at 6:40pm	Print Post
	Yes 1.6.5 is fine, most versions are okay but sometimes it saves time to test a common version. I thought that might be the case that it failed in the arduino ide. That means it's a design problem with the code in some way. You are right that you have to include the lib files in the master .ino otherwise the library sources are not detected during compile. This is an old rule for arduino but it might be about to change with their next ide version build process. The main problem is that it doesn't sound like the I2CDevLib has an I2CDevLib.h. This would allow both visual micro and arduino to more clearly know the library that is required. It's the published way for a library to work. The following rule will help:- Normally a .h file will have an #ifndef LIBNAME condition around the code. If that's missing you will get this error when the .h is included in more than one code file. To see the syntax use visual micro to create a "new cpp and header file"


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DER_ANFÄNGER Newbies Offline Posts: 4 Joined: Oct 3^rd, 2015	Re: Multiple Definition Error Reply #4 - Oct 3^rd, 2015 at 6:58pm	Print Post
	the headers from the lib have a #ifndef condition and mine too .. .:/
	« Last Edit: Oct 3^rd, 2015 at 6:59pm by DER_ANFÄNGER »

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Tim@Visual Micro Administrator Offline Posts: 12191 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Multiple Definition Error Reply #5 - Oct 3^rd, 2015 at 7:06pm	Print Post
	I'm not that strong with arduino code. Why not ask on http://arduino.cc/forum. Because it also fails in the arduino ide it is a valid question for arduino.cc.


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DER_ANFÄNGER Newbies Offline Posts: 4 Joined: Oct 3^rd, 2015	Re: Multiple Definition Error Reply #6 - Oct 3^rd, 2015 at 7:06pm	Print Post
	Okay thank you


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