xaizek / unused-funcs (License: GPLv2+) (since 2018-12-07)
Clang-based standalone tool that detects unused external functions in a set of source files.
File Mode Size
src/ 040000
tests/ 040000
CMakeLists.txt 100644 353B
LICENSE 100644 18KiB
README.md 100644 1,325B



The code was "modernized" (the term is too ambiguous and subjective to take it seriously) and thus has slightly diverged from the way it's presented in the post. Original tree that corresponds to the text can be browsed here.

Brief description

Clang-based standalone tool that diagnoses the following cases of defining functions:

  • completely unused functions declared as extern;
  • functions declared as extern which are used only locally and thus can be made static.



static void firstStatic(void);
static void secondStatic(void);

void firstExtern(void);

extern void secondExtern(void);

static void firstStatic(void)  { }
static void secondStatic(void) { }

void firstExtern(void)  { }
void secondExtern(void) { }

    return 0;

Run command:

bin/unused-funcs main.c --

Output (paths are truncated):

.../main.c:20:firstExtern:can be made static


  1. Clone the repository to llvm/tools/clang/tools/extra.
  2. Add add_subdirectory(unused-funcs) to CMakeLists.txt in the same directory.
  3. Run ninja unused-funcs inside your LLVM's build/ directory.

Before first commit, do not forget to setup your git environment:
git config --global user.name "your_name_here"
git config --global user.email "your@email_here"

Clone this repository using HTTP(S):
git clone https://code.reversed.top/user/xaizek/unused-funcs

Clone this repository using ssh (do not forget to upload a key first):
git clone ssh://rocketgit@code.reversed.top/user/xaizek/unused-funcs

You are allowed to anonymously push to this repository.
This means that your pushed commits will automatically be transformed into a pull request:
... clone the repository ...
... make some changes and some commits ...
git push origin master