VS Arduino - C++ class linking causes error

Oct 4^th, 2024 at 10:32pm (UTC)

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VS Arduino › › › C++ class linking causes error

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C++ class linking causes error (Read 1225 times)

Fabruary22 Newbies Offline Posts: 3 Joined: Mar 17^th, 2023	C++ class linking causes error Mar 17^th, 2023 at 12:22pm	Print Post
	Dear community. Pleas tell me what's wrong with my project. Code Compiling debug version of 'esp-rom' for 'Generic ESP8266 Module (esp8266_generic)' ld.exe: esp-rom.cpp.o:(.text.setup+0x44): undefined reference to _ZN10UpdaterEsp15printWiFiStatusEv ld.exe: esp-rom.cpp.o:(.text.setup+0x48): undefined reference to _ZN10UpdaterEsp7listDirEPKc ld.exe: esp-rom.cpp.o: in function setup esp-rom.ino:174: undefined reference to _ZN10UpdaterEsp15printWiFiStatusEv ld.exe: E:\IDE\ARDUINO\HTTP_stm32_uploader\esp-rom\esp-rom.ino:176: undefined reference to _ZN10UpdaterEsp7listDirEPKc collect2.exe*: error: ld returned 1 exit status Error linking for board Generic ESP8266 Module (esp8266_generic) Debug build failed for project 'esp-rom' I use Visual Studio Community 2022 and Visual Micro. There are three files, main.ino and pair of .h and .cpp with class declaration and definition. When i put class definition to main.ino all links fine but if different files error appears. I think it is so easy my mistake but i dont want to learn c++ just one program.

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Fabruary22 Newbies Offline Posts: 3 Joined: Mar 17^th, 2023	Re: C++ class linking causes error Reply #1 - Mar 17^th, 2023 at 12:23pm	Print Post
	3rd file with class declaration.

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Simon@Visual Micro Administrator Offline Posts: 2377 Joined: Feb 13^th, 2019	Re: C++ class linking causes error Reply #2 - Mar 17^th, 2023 at 1:01pm	Print Post
	We cannot assist with user specific code issues generally. I believe the issue you have is the function definitions in the UpdaterEsp.cpp, are not qualified as belonging to the declared class. i.e. instead of void listDir(const char* dirname) It should be: void UpdaterEsp::listDir(const char* dirname)


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Fabruary22 Newbies Offline Posts: 3 Joined: Mar 17^th, 2023	Re: C++ class linking causes error Reply #3 - Mar 17^th, 2023 at 1:54pm	Print Post
	Excuse me. 100% you are right! I change scope of methods in .cpp file and it now compiled. Thank YOU


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