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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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Configure emacs as c/cpp ide

1. install company, lsp-mode, flycheck, lsp-ui

2. install clangd in ubuntu, then M-x customize-group RET lsp-clangd give clandg file paths, etc

2. In project folder create file .dir-locals.el (refer following link https://blog.mohitkrgupta.dev/2024/08/how-to-configure-dir-localsel-file-for.html)

((nil . ((eval . (progn

   (require 'lsp-mode)

   (lsp-deferred)

   ;;(hs-minor-mode t)

   (flycheck-mode t)

   (global-ede-mode t))))))

3. In project folder create .clangd file:

CompileFlags:

  Add: ["-I/usr/include/postgresql","-I/usr/include/postgresql/17/server","-I/usr/include/glib-2.0","-I/usr/lib/x86_64-linux-gnu/glib-2.0/include"]

---

If:

  PathMatch: .*\.hpp

CompileFlags:

  Add: ["-std=c++23"]

---

If:

  PathMatch: .*\.cpp

CompileFlags:

  Add: ["-std=c++23"]

---

If:

  PathMatch: .*\.h

CompileFlags:

  Add: [-std=gnu18, -Wall, -Wextra, -Wno-nested-functions]

---

If:

  PathMatch: .*\.c

CompileFlags:

  Add: [-std=gnu18, -Wall, -Wextra, -Wno-nested-functions]

---



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If you have any doubts, please let me know.

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