c++ - 带有 lua lib 的 xcode c++ 项目出现链接错误

Question

首先，我创建一个 C++ 控制台项目。 然后，我从lua.org下载lua5.2.0，然后使用lib[make macosx test]并得到liblua.a。 最后，我将lua src导入到项目中，并将liblua.a拖到项目中，编写一些演示代码并编译，但出现链接错误，我确认没有语法错误。

Ld /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug/LuaAdapter normal x86_64
    cd /Users/luocaixin/Desktop/xcodeWS1/LuaAdapter
    export MACOSX_DEPLOYMENT_TARGET=10.10
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++ -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -L/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug -L/Users/luocaixin/Desktop/xcodeWS1/LuaAdapter/Lua.5.2.0/src -F/Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug -filelist /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/LuaAdapter.LinkFileList -mmacosx-version-min=10.10 -stdlib=libc++ -llua -Xlinker -dependency_info -Xlinker /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/LuaAdapter_dependency_info.dat -o /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Products/Debug/LuaAdapter

duplicate symbol _main in:
    /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/lua.o
    /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/luac.o
duplicate symbol _main in:
    /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/lua.o
    /Users/luocaixin/Library/Developer/Xcode/DerivedData/LuaAdapter-dwqvzxkkhfmcsneiftgqstjfemts/Build/Intermediates/LuaAdapter.build/Debug/LuaAdapter.build/Objects-normal/x86_64/main.o
ld: 2 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我想知道是什么原因导致这个错误以及如何在xcode c++中导入lua 正确投影。

Answer 1

你读到错误了吗？它告诉您出了什么问题:您有多个 main 函数。您已经包含了两个包含 main 函数(lua、luac)的对象文件，并且您的测试应用程序中可能也有一个。您需要将这些文件保留在项目之外。它们分别是引用命令行解释器和编译器。如果您将 Lua 作为库嵌入，则不需要包含它们。