Xamarin.Mac和C ++

Question

Xamarin.Mac和C ++

我正在尝试在Visual Studio for Mac中使用C ++库（.a）（a.k.a. Xamarin）我在网上找到了一些关于在Xamarin（https://developer.xamarin.com/guides/ios/advanced_topics/native_interop/）中链接本地库的信息，但是因为Visual Studio for Mac已经用完了所以它已经过时了。

我将这两个项目上传到https://github.com/dawmster/XamarinAndCpp

什么是好的

MyCppLib 编译正常并生成libMyCppLib.a 我打算只导出两个C函数（my_C_Function, my_second_C_Function - MyCppLib.cpp），但我无法删除其他sybols - 这似乎是问题的根源

extern "C" {
        int my_C_Function();
        int my_second_C_Function();
}

在XamarinMacApp中引用libMyCppLib.a（添加到解决方案中）。并在AppDelegate.cs中调用my_C_Function，如下所示：

using System.Runtime.InteropServices;

namespace XamarinMacApp
{

    [Register("AppDelegate")]
    public class AppDelegate : NSApplicationDelegate {

        public AppDelegate(){}

        [DllImport("__Internal")]
        static extern int my_C_Function();
        public override void DidFinishLaunching(NSNotification notification)
        {
            int myretval = my_C_Function();
        }

        public override void WillTerminate(NSNotification notification)
        {
            // Insert code here to tear down your application
        }
    }
}

什么不行

XamarinMacApp - 无法编译并出现以下错误：

请注意，C函数（my_C_Function, my_second_C_Function未在下面的错误中列出）。似乎只有C ++标准库无法链接。

Full Visual Studio Mac compiler log.

Full Xcode compiler log

Undefined symbols for architecture x86_64:
      "std::__1::locale::use_facet(std::__1::locale::id&) const", referenced from:
          l004 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::ios_base::getloc() const", referenced from:
          l004 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__init(unsigned long, char)", referenced from:
          l007 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()", referenced from:
          l007 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::basic_ostream<char, std::__1::char_traits<char> >::put(char)", referenced from:
          l004 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::basic_ostream<char, std::__1::char_traits<char> >::flush()", referenced from:
          l004 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::sentry(std::__1::basic_ostream<char, std::__1::char_traits<char> >&)", referenced from:
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::basic_ostream<char, std::__1::char_traits<char> >::sentry::~sentry()", referenced from:
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::cout", referenced from:
          l002 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::ctype<char>::id", referenced from:
          l004 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::locale::~locale()", referenced from:
          l004 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::ios_base::__set_badbit_and_consider_rethrow()", referenced from:
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::__1::ios_base::clear(unsigned int)", referenced from:
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "std::terminate()", referenced from:
          l008 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "operator delete(void*)", referenced from:
          l001 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "operator new(unsigned long)", referenced from:
          l001 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "___cxa_begin_catch", referenced from:
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          l008 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "___cxa_end_catch", referenced from:
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
      "___gxx_personality_v0", referenced from:
          l004 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          l005 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          l007 in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
          Dwarf Exception Unwind Info (__eh_frame) in libMyCppLib.a(libMyCppLib.a-x86_64-master.o)
    ld: symbol(s) not found for architecture x86_64
    clang : error : linker command failed with exit code 1 (use -v to see invocation)

    MMP : error MM5109: Native linking failed with error code 1.  Check build log for details.
Done building target "_CompileToNative" in project "XamarinMacApp.csproj" -- FAILED.

Done building project "XamarinMacApp.csproj" -- FAILED.

任何想法如何前进？

在Visual Studio Mac解决方案（Xamarin.Mac应用程序）中使用C / C ++库？

Xamarin.Mac和C ++

目录

什么是好的

什么不行

XamarinMacApp - 无法编译并出现以下错误：

0 个答案: