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----
-title: Extend Lua with custom C functions using Clang
-url: extend-lua-with-custom-c.html
-date: 2023-05-23T12:00:00+02:00
-type: note
-draft: false
-tags: [lua, c]
----
-
-Here is a boilerplate for extending Lua with custom C functions. This requires
-Clang and Lua 5.1 to be installed. GCC can be used instead of Clang, but the
-Makefile will need to be modified.
-
-- nativefunc.c
-
-  ```c
-  #include <lua.h>
-  #include <lauxlib.h>
-
-  static int l_mult50(lua_State *L) {
-    double number = luaL_checknumber(L, 1);
-    lua_pushnumber(L, number * 50);
-    return 1;
-  }
-
-  int luaopen_nativefunc(lua_State *L) {
-    static const struct luaL_Reg nativeFuncLib[] = {{"mult50", l_mult50}, {NULL, NULL}};
-
-    luaL_register(L, "nativelib", nativeFuncLib);
-    return 1;
-  }
-  ```
-
-- main.lua
-
-  ```lua
-  require "nativefunc"
-  print(nativelib.mult50(50))
-  ```
-
-- Makefile
-
-  ```Makefile
-  CC       = clang
-  CFLAGS   =
-  INCLUDES = `pkg-config lua5.1 --cflags-only-I`
-
-  all:
-    $(CC) -shared -o nativefunc.so -fPIC nativefunc.c $(CFLAGS) $(INCLUDES)
-
-  clean:
-    rm *.so
-  ```
-