No variables seen in the debugging window in Vimspector while debugging a c++ program in Neovim. Breakpoints set are not seen too

Question

I am new to this Neovim debugging using Vimspector. When i set breakpoints and open debugger i am unable to see any variables or see breakpoints itself. What might be wrong here? Vimspector Debugger when opened,showing no variables or break points.

Code with breakpoint set.

Below is my .vimspector.json

{
"configurations": {
  "C - Launch": {
    "adapter": "vscode-cpptools",
    "configuration": {
      "request": "launch",
      "externalConsole": true,
      "stopOnEntry": true,
      "stopAtEntry": true,
      "MIMode": "gdb",
      "cwd": "${workspaceRoot}",
      "program": "${workspaceRoot}/test"
    }
  }
  }
} 

---

Below is my innit.vim code if needed:

:set number
:set relativenumber
:set autoindent
:set tabstop=4
:set shiftwidth=4
:set smarttab
:set softtabstop=4
:set mouse=a

call plug#begin()
Plug 'voldikss/vim-browser-search'
   Plug 'preservim/nerdtree'
    Plug 'pineapplegiant/spaceduck', { 'branch': 'main' }
Plug 'https://github.com/tc50cal/vim-terminal'
Plug 'http://github.com/tpope/vim-surround' " Surrounding ysw)
Plug 'https://github.com/tpope/vim-commentary' " For Commenting gcc & gc
Plug 'https://github.com/vim-airline/vim-airline' " Status bar
Plug 'https://github.com/lifepillar/pgsql.vim' 
Plug 'https://github.com/ap/vim-css-color' " CSS Color Preview
Plug 'https://github.com/rafi/awesome-vim-colorschemes' " Retro Scheme
Plug 'https://github.com/neoclide/coc.nvim'  " Auto Completion
Plug 'https://github.com/ryanoasis/vim-devicons' " Developer Icons
Plug 'https://github.com/preservim/tagbar' " Tagbar for code navigation
Plug 'https://github.com/terryma/vim-multiple-cursors' " CTRL + N for multiple cursors
Plug 'https://github.com/puremourning/vimspector'
set encoding=UTF-8
call plug#end()

let g:vimspector_enable_mappings = 'HUMAN'



nmap <silent> <Leader>s <Plug>SearchNormal
vmap <silent> <Leader>s <Plug>SearchVisual
nnoremap <C-f> :NERDTreeFocus<CR>
nnoremap <C-n> :NERDTree<CR>
nnoremap <C-t> :NERDTreeToggle<CR>
nnoremap <C-l> :call CocActionAsync('jumpDefinition')<CR>

nmap <F8> :TagbarToggle<CR>

:set completeopt-=preview " For No Previews

let g:NERDTreeDirArrowExpandable="+"
let g:NERDTreeDirArrowCollapsible="~"

" --- Just Some Notes ---
" :PlugClean :PlugInstall :UpdateRemotePlugins
"
" :CocInstall coc-python
" :CocInstall coc-clangd
" :CocInstall coc-snippets
" :CocCommand snippets.edit... FOR EACH FILE TYPE

" air-line
let g:airline_powerline_fonts = 1

if !exists('g:airline_symbols')
    let g:airline_symbols = {}
endif

" airline symbols
let g:airline_left_sep = ''
let g:airline_left_alt_sep = ''
let g:airline_right_sep = ''
let g:airline_right_alt_sep = ''
let g:airline_symbols.branch = ''
let g:airline_symbols.readonly = ''
let g:airline_symbols.linenr = ''

inoremap <expr> <Tab> pumvisible() ? coc#_select_confirm() : "<Tab>"


  if exists('+termguicolors')
      let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
      let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
      set termguicolors
    endif

   colorscheme spaceduck

let g:vimspector_enable_mappings = 'HUMAN'
nnoremap <Leader>dd :call vimspector#Launch()<CR>
nnoremap <Leader>dx :call vimspector#Reset()<CR>
nnoremap <Leader>de :call vimspectorEval
nnoremap <Leader>dw :call vimspectorWatch
nnoremap <Leader>do :call vimspectorShowOutput

Answer 1

This issue is same with me, solution is: Compile source code with option -g to generate debug info, eg. gcc -g -o test test.c .

after that Vimspector vairable diplay correctly.

You should try gdb first, eg. gdb test, gcc without option -g, output:

Reading symbols from test... (No debugging symbols found in test)