I get this error mental error about olcpixelgameengine

[SharkMachine]

There is an example command in olcPixelGameEngine source

Please note that you need to install the development packages for

• libpng, package probably named libpng-dev like in Ubuntu
• OpenGL, package probably named libglu1-mesa-dev like in Ubuntu
• X11, package probably named libx11-dev like in Ubuntu
• pthread, package probably named libpthread-stubs0-dev like in Ubuntu. This will probably be installed when you install X11 development packages.

I tried with the following command myself and it compiled without any problems.

g++ -o olcExampleProgram olcExampleProgram.cpp -lX11 -lGL -lpthread -lpng -lstdc++fs

EDIT: Tested this on my Ubuntu 18.04 desktop

[Moros1138]

You are getting undefined reference errors for PGE functions because you are failing to include the implementation.

before your #include directive for the PGE header you need to #define OLC_PGE_APPLICATION like so.

#define OLC_PGE_APPLICATION
#include "olcPixelGameEngine.h"

[jamieduk]

For more info i used linux mint 64 bit with g++ installed and them dev tools!

[jamieduk]

Full list of errors!

g++ olcExampleProgram.cpp

/tmp/ccKGgmLV.o: In function `olc::pngReadStream(png_struct_def*, unsigned char*, unsigned long)':

olcExampleProgram.cpp:(.text+0x7fa): undefined reference to `png_get_io_ptr'

/tmp/ccKGgmLV.o: In function `olc::Sprite::LoadFromFile(std::__cxx11::basic_string<char, std::char_traits, std::allocator >, olc::ResourcePack*)::{lambda()#1}::operator()() const':

olcExampleProgram.cpp:(.text+0x858): undefined reference to `png_read_info'

olcExampleProgram.cpp:(.text+0x878): undefined reference to `png_get_image_width'

olcExampleProgram.cpp:(.text+0x8a4): undefined reference to `png_get_image_height'

olcExampleProgram.cpp:(.text+0x8d1): undefined reference to `png_get_color_type'

olcExampleProgram.cpp:(.text+0x8f4): undefined reference to `png_get_bit_depth'

olcExampleProgram.cpp:(.text+0x90f): undefined reference to `png_set_strip_16'

olcExampleProgram.cpp:(.text+0x927): undefined reference to `png_set_palette_to_rgb'

olcExampleProgram.cpp:(.text+0x945): undefined reference to `png_set_expand_gray_1_2_4_to_8'

olcExampleProgram.cpp:(.text+0x96a): undefined reference to `png_get_valid'

olcExampleProgram.cpp:(.text+0x985): undefined reference to `png_set_tRNS_to_alpha'

olcExampleProgram.cpp:(.text+0x9b3): undefined reference to `png_set_filler'

olcExampleProgram.cpp:(.text+0x9d1): undefined reference to `png_set_gray_to_rgb'

olcExampleProgram.cpp:(.text+0x9f1): undefined reference to `png_read_update_info'

olcExampleProgram.cpp:(.text+0xa45): undefined reference to `png_get_rowbytes'

olcExampleProgram.cpp:(.text+0xa87): undefined reference to `png_read_image'

/tmp/ccKGgmLV.o: In function `olc::Sprite::LoadFromFile(std::__cxx11::basic_string<char, std::char_traits, std::allocator >, olc::ResourcePack*)':

olcExampleProgram.cpp:(.text+0xc61): undefined reference to `png_create_read_struct'

olcExampleProgram.cpp:(.text+0xc87): undefined reference to `png_create_info_struct'

olcExampleProgram.cpp:(.text+0xcbc): undefined reference to `png_set_longjmp_fn'

olcExampleProgram.cpp:(.text+0xd2f): undefined reference to `png_init_io'

olcExampleProgram.cpp:(.text+0xdab): undefined reference to `png_set_read_fn'

/tmp/ccKGgmLV.o: In function `olc::ResourcePack::AddFile(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&)':

olcExampleProgram.cpp:(.text+0x175c): undefined reference to `std::experimental::filesystem::v1::file_size(std::experimental::filesystem::v1::__cxx11::path const&)'

/tmp/ccKGgmLV.o: In function `olc::PixelGameEngine::SetScreenSize(int, int)':

olcExampleProgram.cpp:(.text+0x2bdd): undefined reference to `glClear'

olcExampleProgram.cpp:(.text+0x2bfe): undefined reference to `glXSwapBuffers'

olcExampleProgram.cpp:(.text+0x2c08): undefined reference to `glClear'

/tmp/ccKGgmLV.o: In function `olc::PixelGameEngine::EngineThread()':

olcExampleProgram.cpp:(.text+0x4f51): undefined reference to `glEnable'

olcExampleProgram.cpp:(.text+0x4f6b): undefined reference to `glGenTextures'

olcExampleProgram.cpp:(.text+0x4f84): undefined reference to `glBindTexture'

olcExampleProgram.cpp:(.text+0x4f98): undefined reference to `glTexParameteri'

olcExampleProgram.cpp:(.text+0x4fac): undefined reference to `glTexParameteri'

olcExampleProgram.cpp:(.text+0x4fc3): undefined reference to `glTexEnvf'

olcExampleProgram.cpp:(.text+0x501d): undefined reference to `glTexImage2D'

olcExampleProgram.cpp:(.text+0x5114): undefined reference to `XPending'

olcExampleProgram.cpp:(.text+0x5141): undefined reference to `XNextEvent'

olcExampleProgram.cpp:(.text+0x517a): undefined reference to `XGetWindowAttributes'

olcExampleProgram.cpp:(.text+0x51b3): undefined reference to `glClear'

olcExampleProgram.cpp:(.text+0x52a9): undefined reference to `XLookupKeysym'

olcExampleProgram.cpp:(.text+0x5314): undefined reference to `XLookupString'

olcExampleProgram.cpp:(.text+0x5369): undefined reference to `XLookupKeysym'

olcExampleProgram.cpp:(.text+0x53d4): undefined reference to `XLookupString'

olcExampleProgram.cpp:(.text+0x59bf): undefined reference to `glViewport'

olcExampleProgram.cpp:(.text+0x5a19): undefined reference to `glTexSubImage2D'

olcExampleProgram.cpp:(.text+0x5a27): undefined reference to `glBegin'

olcExampleProgram.cpp:(.text+0x5a38): undefined reference to `glTexCoord2f'

olcExampleProgram.cpp:(.text+0x5a7d): undefined reference to `glVertex3f'

olcExampleProgram.cpp:(.text+0x5a8a): undefined reference to `glTexCoord2f'

olcExampleProgram.cpp:(.text+0x5acf): undefined reference to `glVertex3f'

olcExampleProgram.cpp:(.text+0x5ae0): undefined reference to `glTexCoord2f'

olcExampleProgram.cpp:(.text+0x5b25): undefined reference to `glVertex3f'

olcExampleProgram.cpp:(.text+0x5b3a): undefined reference to `glTexCoord2f'

olcExampleProgram.cpp:(.text+0x5b7f): undefined reference to `glVertex3f'

olcExampleProgram.cpp:(.text+0x5b84): undefined reference to `glEnd'

olcExampleProgram.cpp:(.text+0x5bab): undefined reference to `glXSwapBuffers'

olcExampleProgram.cpp:(.text+0x5d1d): undefined reference to `XStoreName'

olcExampleProgram.cpp:(.text+0x5d9d): undefined reference to `glXMakeCurrent'

olcExampleProgram.cpp:(.text+0x5dc4): undefined reference to `glXDestroyContext'

olcExampleProgram.cpp:(.text+0x5deb): undefined reference to `XDestroyWindow'

olcExampleProgram.cpp:(.text+0x5e01): undefined reference to `XCloseDisplay'

/tmp/ccKGgmLV.o: In function `olc::PixelGameEngine::olc_WindowCreate()':

olcExampleProgram.cpp:(.text+0x61f8): undefined reference to `XInitThreads'

olcExampleProgram.cpp:(.text+0x6202): undefined reference to `XOpenDisplay'

olcExampleProgram.cpp:(.text+0x62ab): undefined reference to `glXChooseVisual'

olcExampleProgram.cpp:(.text+0x62f6): undefined reference to `XCreateColormap'

olcExampleProgram.cpp:(.text+0x63d9): undefined reference to `XCreateWindow'

olcExampleProgram.cpp:(.text+0x6410): undefined reference to `XInternAtom'

olcExampleProgram.cpp:(.text+0x6447): undefined reference to `XSetWMProtocols'

olcExampleProgram.cpp:(.text+0x646e): undefined reference to `XMapWindow'

olcExampleProgram.cpp:(.text+0x649c): undefined reference to `XStoreName'

olcExampleProgram.cpp:(.text+0x64d4): undefined reference to `XInternAtom'

olcExampleProgram.cpp:(.text+0x64fd): undefined reference to `XInternAtom'

olcExampleProgram.cpp:(.text+0x65bf): undefined reference to `XMapWindow'

olcExampleProgram.cpp:(.text+0x661f): undefined reference to `XSendEvent'

olcExampleProgram.cpp:(.text+0x6635): undefined reference to `XFlush'

olcExampleProgram.cpp:(.text+0x6663): undefined reference to `XGetWindowAttributes'

/tmp/ccKGgmLV.o: In function `olc::PixelGameEngine::olc_OpenGLCreate()':

olcExampleProgram.cpp:(.text+0x7341): undefined reference to `glXCreateContext'

olcExampleProgram.cpp:(.text+0x7387): undefined reference to `glXMakeCurrent'

olcExampleProgram.cpp:(.text+0x73b5): undefined reference to `XGetWindowAttributes'

olcExampleProgram.cpp:(.text+0x73d4): undefined reference to `glViewport'

olcExampleProgram.cpp:(.text+0x73eb): undefined reference to `glXGetProcAddress'

/tmp/ccKGgmLV.o: In function `std::experimental::filesystem::v1::exists(std::experimental::filesystem::v1::__cxx11::path const&)':

olcExampleProgram.cpp:(.text._ZNSt12experimental10filesystem2v16existsERKNS1_7__cxx114pathE[_ZNSt12experimental10filesystem2v16existsERKNS1_7__cxx114pathE]+0x14): undefined reference to `std::experimental::filesystem::v1::status(std::experimental::filesystem::v1::__cxx11::path const&)'

/tmp/ccKGgmLV.o: In function `std::experimental::filesystem::v1::__cxx11::path::path<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::experimental::filesystem::v1::__cxx11::path>(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&)':

olcExampleProgram.cpp:(.text.ZNSt12experimental10filesystem2v17__cxx114pathC2INSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES3_EERKT[ZNSt12experimental10filesystem2v17__cxx114pathC5INSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEES3_EERKT]+0x70): undefined reference to `std::experimental::filesystem::v1::__cxx11::path::_M_split_cmpts()'

/tmp/ccKGgmLV.o: In function `std::thread::thread<void (olc::PixelGameEngine::)(), olc::PixelGameEngine>(void (olc::PixelGameEngine::&&)(), olc::PixelGameEngine&&)':

olcExampleProgram.cpp:(.text.ZNSt6threadC2IMN3olc15PixelGameEngineEFvvEJPS2_EEEOT_DpOT0[ZNSt6threadC5IMN3olc15PixelGameEngineEFvvEJPS2_EEEOT_DpOT0]+0x33): undefined reference to `pthread_create'

collect2: error: ld returned 1 exit status

[OneLoneCoder]

I try to ensure that all the packages you need are covered by build-essentials

[SharkMachine]

I try to ensure that all the packages you need are covered by build-essentials

I completely forgot about build essentials, which is definitely something you should install if you want to compile C or C++ code. Sadly, installing build-essential package in Ubuntu (and most likely in its derivatives) will not install the 4 development packages I mentioned in my previous comment.

I already had build essentials installed and had to install libpng-dev, libglu1-mesa-dev and libx11-dev to get olcPixelGameEngine to build.

[tiagopn]

Hi... I tried to run the example code (changing just the name of the cop and code). I run on a Ubuntu 18 with g++-9 with the following command:

g++-9 main.cpp -o path -lX11 -lGL -lpthread -lpng -lstdc++fs -std=c++17

And got the following error:

/tmp/cchWv4Kp.o: In function main': main.cpp:(.text+0x56): undefined reference to olc::PixelGameEngine::Construct(int, int, int, int, bool, bool)'
main.cpp:(.text+0x72): undefined reference to olc::PixelGameEngine::Start()' /tmp/cchWv4Kp.o: In function __static_initialization_and_destruction_0(int, int)':
main.cpp:(.text+0x130): undefined reference to olc::Pixel::Pixel(unsigned char, unsigned char, unsigned char, unsigned char)' main.cpp:(.text+0x151): undefined reference to olc::Pixel::Pixel(unsigned char, unsigned char, unsigned char, unsigned char)'
main.cpp:(.text+0x172): undefined reference to olc::Pixel::Pixel(unsigned char, unsigned char, unsigned char, unsigned char)' main.cpp:(.text+0x193): undefined reference to olc::Pixel::Pixel(unsigned char, unsigned char, unsigned char, unsigned char)'
main.cpp:(.text+0x1b4): undefined reference to olc::Pixel::Pixel(unsigned char, unsigned char, unsigned char, unsigned char)' /tmp/cchWv4Kp.o:main.cpp:(.text+0x1d5): more undefined references to olc::Pixel::Pixel(unsigned char, unsigned char, unsigned char, unsigned char)' follow
/tmp/cchWv4Kp.o: In function Path::Path()': main.cpp:(.text._ZN4PathC2Ev[_ZN4PathC5Ev]+0x15): undefined reference to olc::PixelGameEngine::PixelGameEngine()'
main.cpp:(.text._ZN4PathC2Ev[_ZN4PathC5Ev]+0x4b): undefined reference to olc::PixelGameEngine::~PixelGameEngine()' /tmp/cchWv4Kp.o:(.data.rel.ro._ZTV4Path[_ZTV4Path]+0x30): undefined reference to olc::PixelGameEngine::OnUserDestroy()'
/tmp/cchWv4Kp.o:(.data.rel.ro._ZTV4Path[_ZTV4Path]+0x38): undefined reference to olc::PixelGameEngine::Draw(int, int, olc::Pixel)' /tmp/cchWv4Kp.o: In function Path::~Path()':
main.cpp:(.text._ZN4PathD2Ev[_ZN4PathD5Ev]+0x22): undefined reference to olc::PixelGameEngine::~PixelGameEngine()' /tmp/cchWv4Kp.o:(.data.rel.ro._ZTI4Path[_ZTI4Path]+0x10): undefined reference to typeinfo for olc::PixelGameEngine'
collect2: error: ld returned 1 exit status

Do you know what is going on?

[realszopen]

I'm getting same errors as above on OpenSuse Tumbleweed, all required packages (I think) I have installed just fine.