VS Arduino - Strange error message

May 8^th, 2025 at 4:18am (UTC)

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VS Arduino › › › Strange error message

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Strange error message (Read 3812 times)

chris52 Junior Member Offline Posts: 47 Joined: Jan 9^th, 2017	Strange error message Jan 9^th, 2017 at 11:49am	Print Post
	Everything fine using this until I included my own 'c' and 'h' file. Now it won't compile in VisualMicro but is OK in Arduino 1.8. The compile output is Quote: ccpgXmY5.ltrans3.ltrans.o: In function TaskTemp Error compiling for board Arduino Mega ADK Debug build failed for project 'wind' wind.ino:176: undefined reference to TableLookup(int) collect2.exe: error: ld returned 1 exit status source code attached. 'TaskTemp' referred to in the message is the only one that calls 'TableLookup', and that is declared and defined in my added files.

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Tim@Visual Micro Administrator Offline Posts: 12187 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Strange error message Reply #1 - Jan 9^th, 2017 at 12:07pm	Print Post
	Hi, Does Build>Rebuild fix the issue?


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chris52 Junior Member Offline Posts: 47 Joined: Jan 9^th, 2017	Re: Strange error message Reply #2 - Jan 9^th, 2017 at 12:18pm	Print Post
	No, tried several times to clean / rebuild. Also tried restarting VS Community 2015 (ver 14.0.25424.00 update 3) but same result


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Tim@Visual Micro Administrator Offline Posts: 12187 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Strange error message Reply #3 - Jan 9^th, 2017 at 3:13pm	Print Post
	I am not sure where the confusion is. With your code I get exactly the same error in the Arduino IDE as I do with Visual Micro. So maybe you can retest with exact same example in the Arduino IDE. The error from Arduino is shown below. To resolve the error I simply changed the extension of your .c file to .cpp. Cpp files are easier for new Arduino users and will work how you expect. They do not always have to contain classes. Code Linking everything together... ... D:\System\WinTemp\cchpxEqb.ltrans1.ltrans.o: In function `TaskTemp': C:\Users\tl\Documents\Arduino\wind/wind.ino:177: undefined reference to `TableLookup(int)' collect2.exe: error: ld returned 1 exit status Using library Arduino_FreeRTOS at version 9.0.0-1 in folder: C:\Users\tl\Documents\Arduino\libraries\Arduino_FreeRTOS exit status 1 Error compiling for board Arduino Duemilanove or Diecimila.


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chris52 Junior Member Offline Posts: 47 Joined: Jan 9^th, 2017	Re: Strange error message Reply #4 - Jan 9^th, 2017 at 5:18pm	Print Post
	Many thanks, renaming to C++ solved it. I still don't understand though why my system compiled OK with the Arduino IDE and yours didn't! Anyway I'm very grateful for the fast support response so I'll now buy the 'pro' version. btw I don't think that cpp is easier (to learn) than c, or did you just mean that Arduino works better with cpp?


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Tim@Visual Micro Administrator Offline Posts: 12187 Location: United Kingdom Joined: Apr 10^th, 2010	Re: Strange error message Reply #5 - Jan 9^th, 2017 at 5:47pm	Print Post
	Hi, It's possible you used different code when testing the arduino ide and missed the #include for the .h from either the .c and/or the .ino


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