LLVM-CXXFILT(1)

💅 LLVM-CXXFILT(1) — the LLVM manual, bestie edition ✨

okay so real talk, this page lives in the LLVM manual set, and it's about a tool that un-mangles C++ symbol names so your brain stops hurting. let's get into it 🫶

---

✨ NAME ✨

llvm-cxxfilt — the LLVM symbol name demangler 🔓 (yes, it un-scrambles those cursed C++ names, no cap)

---

🌸 SYNOPSIS 🌸

llvm-cxxfilt [options] [mangled names...]

---

🦋 DESCRIPTION 🦋

llvm-cxxfilt is a symbol demangler, and it can literally be used as a replacement for the GNU c++filt tool 💖 It takes a series of symbol names and prints their demangled form on the standard output stream. And if a name can't be demangled? no drama — it's simply printed as is. icon behavior honestly.

If no names are specified on the command-line, names are read interactively from the standard input stream 👀 When it's reading names from standard input, each input line is split on characters that are not part of valid Itanium name manglings, i.e. characters that are not alphanumeric, ., $, or _. Separators between names are copied to the output as is — so your vibe of the line stays intact, fr fr.

---

🎀 EXAMPLE 🎀

$ llvm-cxxfilt _Z3foov _Z3bari not_mangled
foo()
bar(int)
not_mangled
$ cat input.txt
| _Z3foov *** _Z3bari *** not_mangled |
$ llvm-cxxfilt < input.txt
| foo() *** bar(int) *** not_mangled |

see how not_mangled just... came back as itself? she's unbothered, she's thriving 💜

---

👑 OPTIONS 👑

• --format=<value>, -s — which mangling scheme to assume. valid values are auto (the default — it auto-detects the style, main character energy) and gnu (assume GNU/Itanium style).
• --help, -h — prints a summary of command line options 📋
• --no-params, -p — do not demangle function parameters or return types. keep it mysterious.
• --no-strip-underscore, -n — do not strip a leading underscore. this is the default for all platforms, so like... it's already the vibe.
• --quote — add " " around demangled names. and it does not quote already quoted names (no double-quoting, we're not animals 🙈).
• --strip-underscore, -_ — strip a single leading underscore, if present, from each input name before demangling ✂️
• --types, -t — attempt to demangle names as type names as well as symbol names 🔍
• --version — display the version of the llvm-cxxfilt executable ⭐
• @<FILE> — read command-line options from response file <FILE> 📁

---

💀 EXIT STATUS 💀

llvm-cxxfilt returns 0 unless it encounters a usage error, in which case a non-zero exit code is returned. so a 0 means she ate, and anything else means you fumbled the invocation 😭

---

🌈 SEE ALSO 🌈

llvm-nm(1) — go give her a read too, iykyk 🧚

---

💖 AUTHOR 💖

Maintained by the LLVM Team (https://llvm.org/). they're the ones keeping this whole thing alive, show some love 👑

---

🍓 COPYRIGHT 🍓

2003-2026, LLVM Project

---

⚠️ quick warning bestie: the hyphen options are short and sneaky — -n and -_ are literally opposites, and mixing them up is a whole personality flaw. read twice, type once 💅

---

and that's the page!! this one's from the LLVM source, version-flavored and dated 2026-10-06, page 23 in the set — mwah, stan, periodt 🎀✨🦋