I want to use the gpio pins and the wiring Pi lib looked good to me
But when I try to compile my programm I get the errors:
undefined reference to ‘wiringPiSetup()’
I know that doesn’t fix your problem as you want to use c++, but it might be a clue as to what is going wrong, for you or somebody else to figure out.
i always have problem when i use a function , i include the libraries without a problem , but when i use its functions it dont recognize it :/ for exemple i use the wiringpi lib:
You should check that you compile with the “-lwiringPi” option or else the compiler/linker will not know where to find those functions you use.
When you do an “#include” you only tell the compiler HOW to use those functions. The functions themselves are in libraries that you have to give to the linker with the “-l” option.
So you are playing around with raspberry pi and the GPIO functions and you want to use the wiringPi library to help you accomplish this. You’ve been using geany as your IDE and you keep getting the: geany undefined reference to ‘WiringPiSetup’ error message.
Find it here in this youtue video.
[embedyt] https://www.youtube.com/watch?v=rv1f1W-LfqM[/embedyt]
First make sure you have installed wiringPi correctly. If installed correctly the key to making this work is to go into the Build -> Set Build Commands Menu and then add:
-lwiringPi to the Build box under commands.
You may also need to add “sudo” in front of the execute commands or you will get a “wiringPiSetup: Must be root. (Did you forget sudo?)” error. Then go Compile, Build, and Execute your file or in geany F8, F9, F5.
