"undefined reference" after copy code

[Fipschen]

Hello together,

two years ago I writed a code for my led matrix in Python. Now, because of performence I'd like zu write it in C++. I'm new and a noob in C++. I'd try to take existing code and change on after another little thinks until I'm at my project. But I'm failing at the beginning: I'd copy the code of /utils/text-scroller.cc and when I'll compile it, I get only "unfefined reference to[...]" errors:

/usr/bin/ld: /tmp/ccxV8ntJ.o: in function usage(char const*)': main.cpp:(.text+0xb0): undefined reference torgb_matrix::RGBMatrix::Options::Options()' /usr/bin/ld: main.cpp:(.text+0xbc): undefined reference to rgb_matrix::RuntimeOptions::RuntimeOptions()' /usr/bin/ld: main.cpp:(.text+0xd0): undefined reference torgb_matrix::PrintMatrixFlags(_IO_FILE, rgb_matrix::RGBMatrix::Options const&, rgb_matrix::RuntimeOptions const&)' /usr/bin/ld: /tmp/ccxV8ntJ.o: in function main': main.cpp:(.text+0x208): undefined reference torgb_matrix::RGBMatrix::Options::Options()' /usr/bin/ld: main.cpp:(.text+0x214): undefined reference to rgb_matrix::RuntimeOptions::RuntimeOptions()' /usr/bin/ld: main.cpp:(.text+0x230): undefined reference torgb_matrix::ParseOptionsFromFlags(int, char**, rgb_matrix::RGBMatrix::Options, rgb_matrix::RuntimeOptions, bool)' /usr/bin/ld: main.cpp:(.text+0x670): undefined reference to rgb_matrix::Font::Font()' /usr/bin/ld: main.cpp:(.text+0x680): undefined reference torgb_matrix::Font::LoadFont(char const)' /usr/bin/ld: main.cpp:(.text+0x6c8): undefined reference to rgb_matrix::RGBMatrix::CreateFromOptions(rgb_matrix::RGBMatrix::Options const&, rgb_matrix::RuntimeOptions const&)' /usr/bin/ld: main.cpp:(.text+0x748): undefined reference torgb_matrix::RGBMatrix::SetPWMBits(unsigned char)' /usr/bin/ld: main.cpp:(.text+0x770): undefined reference to rgb_matrix::RGBMatrix::CreateFrameCanvas()' /usr/bin/ld: main.cpp:(.text+0x7ac): undefined reference torgb_matrix::Font::CharacterWidth(unsigned int) const' /usr/bin/ld: main.cpp:(.text+0x8b0): undefined reference to rgb_matrix::DrawText(rgb_matrix::Canvas*, rgb_matrix::Font const&, int, int, rgb_matrix::Color const&, rgb_matrix::Color const*, char const*, int)' /usr/bin/ld: main.cpp:(.text+0x92c): undefined reference torgb_matrix::RGBMatrix::SwapOnVSync(rgb_matrix::FrameCanvas*, unsigned int)' /usr/bin/ld: main.cpp:(.text+0x974): undefined reference to rgb_matrix::Font::~Font()' /usr/bin/ld: main.cpp:(.text+0x994): undefined reference torgb_matrix::Font::~Font()' collect2: error: ld returned 1 exit status`

It's to 100 % the code from utils/text-scroller.cc. The only diferent is the path to file: /directory/main.cpp /rpi-rgb-led-matrix/[...] But the include must be right, I'll don't get a include-error.

Can someone help me..?

Thanks

Fipschen

[hzeller]

Looks like your code does not link the library.

[Fipschen]

Thank you facepalm I tought to set the include is enough. Now it works.

Thank you also for the library :)