VS Arduino - undefined references

Dec 13^th, 2025 at 4:15am (UTC)

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VS Arduino › Visual Micro › Project Guidance › undefined references

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undefined references (Read 3140 times)

neuling Newbies Offline Posts: 3 Location: Germany Joined: Dec 15^th, 2020	undefined references Dec 15^th, 2020 at 2:48pm	Print Post
	Hi I am currently trying to refactor my working program. Now it should be properly divided by the classes. But I am now wondering about the compiler error messages. There is, as it should be, only one main .ino . Compiler gives something like this about different variables: "Controller.ino:30: undefined reference to bRT_FallingEdgeDetected". But all these variables are declared/definded in #included header files before. Visual Studio Intellisense does not complain either. Compiler output is attached in separate email to you Thanks in advance for your help!


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Simon@Visual Micro Administrator Offline Posts: 2824 Joined: Feb 13^th, 2019	Re: undefined references Reply #1 - Dec 15^th, 2020 at 3:12pm	Print Post
	Would it be possible to ZIP the whole project and send this to us via email? (we do not share the code, and will remove it once the problem is resolved)


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neuling Newbies Offline Posts: 3 Location: Germany Joined: Dec 15^th, 2020	Re: undefined references Reply #2 - Dec 16^th, 2020 at 7:07am	Print Post
	project is sent. Thank you!


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Simon@Visual Micro Administrator Offline Posts: 2824 Joined: Feb 13^th, 2019	Re: undefined references Reply #3 - Dec 16^th, 2020 at 2:55pm	Print Post
	Thanks for the project, and this results in the same errors in the Arduino IDE as well, so not a problem directly linked to vMicro. If you add the below two lines of code to the Utilities524_33.cpp, below the includes, it will compile as expected. Code const BusPuls TimesDefinition; volatile boolean bRT_FallingEdgeDetected; The extern declaration in the *.h, makes it global, but needs a non-extern declaration in "a" source file to actually define the variable.


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neuling Newbies Offline Posts: 3 Location: Germany Joined: Dec 15^th, 2020	Re: undefined references Reply #4 - Dec 19^th, 2020 at 9:30am	Print Post
	Thank you very much! Now with the knowledge I have come further


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