CMAKE：如何包含和链接 Lua 5.1 库？

Question

我是 CMake 的新手，现在对我来说这一切都像是黑魔法。我令牌的例子来自这里！如何正确包含 Lua(5.1) lib 并将其与 CMake 链接？

示例在手工编译时工作，如

$gcc -W -Wall -g -o main main.c -I/usr/local/include -L/usr/local/lib/lua/5.1 -llua

#include <stdio.h>
#include <string.h>

#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"

int main(void) {
    puts("lua interpretor:");
    char buff[256];
    int error;

    lua_State *L = luaL_newstate(); /* opens Lua */
    luaL_openlibs(L); /* opens the standard libraries */

    while (fgets(buff, sizeof(buff), stdin) != NULL) {
        error = luaL_loadbuffer(L, buff, strlen(buff), "line") ||
                lua_pcall(L, 0, 0, 0);
        if (error) {
            fprintf(stderr, "%s", lua_tostring(L, -1));
            lua_pop(L, 1); /* pop error message from the stack */
        }
    }
    lua_close(L);
    return 0;
}

当前 CMakeList.txt 看起来像

cmake_minimum_required(VERSION 3.8)

project(test)

set(CMAKE_C_STANDARD 11)
set(SOURCE_FILES main.c)

include_directories(/usr/local/include)

add_executable(test ${SOURCE_FILES})

和错误日志

Undefined symbols for architecture x86_64:
  "_luaL_loadbufferx", referenced from:
      _main in main.c.o
  "_luaL_newstate", referenced from:
      _main in main.c.o
  "_luaL_openlibs", referenced from:
      _main in main.c.o
  "_lua_close", referenced from:
      _main in main.c.o
  "_lua_pcallk", referenced from:
      _main in main.c.o
  "_lua_settop", referenced from:
      _main in main.c.o
  "_lua_tolstring", referenced from:
      _main in main.c.o

Answer 1

您尚未将 Lua 库链接到可执行文件。这是使用target_link_libraries(). 不过，您首先需要找到或指定库的位置。幸运的是，Lua 附带了一个用于查找 Lua的 cmake 脚本。

project(test)

find_package(Lua51 REQUIRED)

include_directories(/usr/local/include ${LUA_INCLUDE_DIR})

set(CMAKE_C_STANDARD 11)
set(SOURCE_FILES main.c)

add_executable(test ${SOURCE_FILES})
target_link_libraries(test ${LUA_LIBRARIES})