C compilation issues

[slavaGanzin]

Hello, Georgi.

Awesome idea, awesome execution.
Really impressed with the speed of transmission in your demo.

# git clone "https://github.com/ggerganov/wave-share"; cd wave-share && mkdir build && cd build; cmake ..; make

Cloning into 'wave-share'...
remote: Enumerating objects: 122, done.
remote: Total 122 (delta 0), reused 0 (delta 0), pack-reused 122
Receiving objects: 100% (122/122), 107.20 KiB | 560.00 KiB/s, done.
Resolving deltas: 100% (62/62), done.
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Found FFTW: /usr/lib/libfftw3.so;/usr/lib/libfftw3f.so  
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vganzin/work/whatnot/wave-share/build
Scanning dependencies of target wave-share
[ 50%] Building CXX object CMakeFiles/wave-share.dir/main.cpp.o
In file included from /home/vganzin/work/whatnot/wave-share/main.cpp:7:
/home/vganzin/work/whatnot/wave-share/reed-solomon/rs.hpp: In member function ‘void RS::ReedSolomon::EncodeBlock(const void*, void*)’:
/home/vganzin/work/whatnot/wave-share/reed-solomon/rs.hpp:76:17: warning: ISO C++ forbids variable length array ‘stack_memory’ [-Wvla]
   76 |         uint8_t stack_memory[MSG_CNT * msg_length + POLY_CNT * ecc_length * 2];
      |                 ^~~~~~~~~~~~
/home/vganzin/work/whatnot/wave-share/reed-solomon/rs.hpp: In member function ‘int RS::ReedSolomon::DecodeBlock(const void*, const void*, void*, uint8_t*, size_t)’:
/home/vganzin/work/whatnot/wave-share/reed-solomon/rs.hpp:152:17: warning: ISO C++ forbids variable length array ‘stack_memory’ [-Wvla]
  152 |         uint8_t stack_memory[MSG_CNT * msg_length + POLY_CNT * ecc_length * 2];
      |                 ^~~~~~~~~~~~
[100%] Linking CXX executable wave-share
/usr/bin/ld: CMakeFiles/wave-share.dir/main.cpp.o: in function `update() [clone .part.0]':
main.cpp:(.text+0x747): undefined reference to `SDL_PollEvent'
/usr/bin/ld: main.cpp:(.text+0x76c): undefined reference to `SDL_PauseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x78e): undefined reference to `SDL_GetQueuedAudioSize'
/usr/bin/ld: main.cpp:(.text+0x7c9): undefined reference to `SDL_PauseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x7d4): undefined reference to `SDL_CloseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x7e4): undefined reference to `SDL_PauseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x7ef): undefined reference to `SDL_CloseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x7f4): undefined reference to `SDL_CloseAudio'
/usr/bin/ld: main.cpp:(.text+0x7f9): undefined reference to `SDL_Quit'
/usr/bin/ld: main.cpp:(.text+0x806): undefined reference to `SDL_PauseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x816): undefined reference to `SDL_PauseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x859): undefined reference to `SDL_PauseAudioDevice'
/usr/bin/ld: main.cpp:(.text+0x8e8): undefined reference to `SDL_ClearQueuedAudio'
/usr/bin/ld: CMakeFiles/wave-share.dir/main.cpp.o: in function `init()':
main.cpp:(.text+0x95c): undefined reference to `SDL_LogSetPriority'
/usr/bin/ld: main.cpp:(.text+0x966): undefined reference to `SDL_Init'
/usr/bin/ld: main.cpp:(.text+0x988): undefined reference to `SDL_SetHintWithPriority'
/usr/bin/ld: main.cpp:(.text+0x996): undefined reference to `SDL_GetNumAudioDevices'
/usr/bin/ld: main.cpp:(.text+0x9b5): undefined reference to `SDL_GetAudioDeviceName'
/usr/bin/ld: main.cpp:(.text+0x9d5): undefined reference to `SDL_GetNumAudioDevices'
/usr/bin/ld: main.cpp:(.text+0xa08): undefined reference to `SDL_GetAudioDeviceName'
/usr/bin/ld: main.cpp:(.text+0xa35): undefined reference to `SDL_memset'
/usr/bin/ld: main.cpp:(.text+0xa6d): undefined reference to `SDL_memset'
/usr/bin/ld: main.cpp:(.text+0xa82): undefined reference to `SDL_GetAudioDeviceName'
/usr/bin/ld: main.cpp:(.text+0xaa6): undefined reference to `SDL_GetAudioDeviceName'
/usr/bin/ld: main.cpp:(.text+0xab9): undefined reference to `SDL_OpenAudioDevice'
/usr/bin/ld: main.cpp:(.text+0xbac): undefined reference to `SDL_GetAudioDeviceName'
/usr/bin/ld: main.cpp:(.text+0xbd3): undefined reference to `SDL_GetAudioDeviceName'
/usr/bin/ld: main.cpp:(.text+0xbeb): undefined reference to `SDL_OpenAudioDevice'
/usr/bin/ld: main.cpp:(.text+0xc00): undefined reference to `SDL_GetError'
/usr/bin/ld: main.cpp:(.text+0xd09): undefined reference to `SDL_GetError'
/usr/bin/ld: main.cpp:(.text+0xdba): undefined reference to `SDL_OpenAudioDevice'
/usr/bin/ld: main.cpp:(.text+0xdf4): undefined reference to `SDL_OpenAudioDevice'
/usr/bin/ld: main.cpp:(.text+0xe09): undefined reference to `SDL_GetError'
/usr/bin/ld: main.cpp:(.text+0xe1c): undefined reference to `SDL_LogError'
/usr/bin/ld: main.cpp:(.text+0xe30): undefined reference to `SDL_CloseAudio'
/usr/bin/ld: CMakeFiles/wave-share.dir/main.cpp.o: in function `DataRxTx::send()':
main.cpp:(.text._ZN8DataRxTx4sendEv[_ZN8DataRxTx4sendEv]+0x30d): undefined reference to `SDL_QueueAudio'
/usr/bin/ld: CMakeFiles/wave-share.dir/main.cpp.o: in function `DataRxTx::receive()':
main.cpp:(.text._ZN8DataRxTx7receiveEv[_ZN8DataRxTx7receiveEv]+0x137): undefined reference to `SDL_DequeueAudio'
/usr/bin/ld: main.cpp:(.text._ZN8DataRxTx7receiveEv[_ZN8DataRxTx7receiveEv]+0xdf6): undefined reference to `SDL_GetQueuedAudioSize'
/usr/bin/ld: main.cpp:(.text._ZN8DataRxTx7receiveEv[_ZN8DataRxTx7receiveEv]+0x1812): undefined reference to `SDL_GetQueuedAudioSize'
/usr/bin/ld: main.cpp:(.text._ZN8DataRxTx7receiveEv[_ZN8DataRxTx7receiveEv]+0x1858): undefined reference to `SDL_ClearQueuedAudio'
/usr/bin/ld: CMakeFiles/wave-share.dir/main.cpp.o: in function `main':
main.cpp:(.text.startup+0x41e): undefined reference to `SDL_Delay'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/wave-share.dir/build.make:105: wave-share] Error 1
make[1]: *** [CMakeFiles/Makefile2:95: CMakeFiles/wave-share.dir/all] Error 2
make: *** [Makefile:103: all] Error 2

p.s. I don't think you should be worried about 1mb emscripten module. Modern sites gets over 5mb easily and nobody complains.

[ggerganov]

Thanks!

Looks like it fails to link the SDL2 lib for some reason.
One option is to try to run cmake -DUSE_FINDSDL2=ON .. instead of cmake ..

If this does not help then try building without using CMake at all.
Simply go to wave-share root and run g++ -std=c++11 -O3 main.cpp -lpthread -lfftw3 -lfftw3f -lSDL2 -o wave-share. This should produce a binary called wave-share.

If it fails again then try to reinstall SDL2 on your system.