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How to use gdb in Ubuntu Terminal

Here's a practical, minimal guide for using GDB in Ubuntu terminal — from launching to setting breakpoints and navigating your code. 🧰 Step 1: Compile with Debug Symbols Use -g and disable optimizations ( -O0 preferred for debugging): bash Copy Edit g++ -g -O0 -o myprog myprog.cpp 🚀 Step 2: Launch GDB bash Copy Edit gdb ./myprog You'll see a (gdb) prompt. 🎯 Step 3: Set Breakpoints You can set breakpoints in three main ways : ✅ a. At a function gdb Copy Edit (gdb) break main ✅ b. At a specific file and line gdb Copy Edit (gdb) break myprog.cpp:42 ✅ c. At a method in a class gdb Copy Edit (gdb) break MyClass::doSomething If the symbol is mangled (C++), GDB usually demangles automatically, especially if compiled with -g . ▶️ Step 4: Run the Program gdb Copy Edit (gdb) run 🧭 Step 5: Navigate Command Meaning next or n Step over current line step or s Step into function call finish Run until current function returns continue or c Continue until...
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emacs Notes: How to configure for c/c++ ide

 (require 'package)

;;(add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/") t)

(add-to-list 'package-archives '("melpa-stable" . "https://stable.melpa.org/packages/") t)

(package-initialize)


(setq package-selected-packages '(lsp-mode yasnippet lsp-treemacs helm-lsp

    projectile hydra flycheck company avy which-key helm-xref dap-mode))


(when (cl-find-if-not #'package-installed-p package-selected-packages)

  (package-refresh-contents)

  (mapc #'package-install package-selected-packages))


;; sample `helm' configuration use https://github.com/emacs-helm/helm/ for details

(helm-mode)

(require 'helm-xref)

(define-key global-map [remap find-file] #'helm-find-files)

(define-key global-map [remap execute-extended-command] #'helm-M-x)

(define-key global-map [remap switch-to-buffer] #'helm-mini)


(which-key-mode)

(add-hook 'c-mode-hook 'lsp)

(add-hook 'c++-mode-hook 'lsp)


(setq gc-cons-threshold (* 100 1024 1024)

      read-process-output-max (* 1024 1024)

      treemacs-space-between-root-nodes nil

      company-idle-delay 0.0

      company-minimum-prefix-length 1

      lsp-idle-delay 0.1)  ;; clangd is fast


(with-eval-after-load 'lsp-mode

  (add-hook 'lsp-mode-hook #'lsp-enable-which-key-integration)

  (require 'dap-cpptools)

  (yas-global-mode))

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