C++ 无法使用 g++-mp-4.4 捕获从 Mac OS 中的 curlpp 抛出的异常

Question

我有以下代码(现在可以编译，感谢@LokiAstari):

要编译下面这段代码，最简单的方法是下载curlpp ，编译它。然后用g++-mp-4.4(由macport安装)编译以下代码，链接到curl和curlpp。

如果 localhost:8080 不存在，它将崩溃(输出:abort trap)。将 g++-mp-4.4 更改为 Xcode 4 默认的 g++，它工作正常。

#include <string>
#include <sstream>
#include <iostream>

#include <curlpp/cURLpp.hpp>
#include <curlpp/Easy.hpp>
#include <curlpp/Options.hpp>

int main(int, char **)
{
    try
    {
        curlpp::Cleanup myCleanup;

        {
          std::ostringstream os;
          os << curlpp::options::Url("http://localhost:8080/");
        }

    }
    catch( curlpp::RuntimeError &e )
    {
        std::cout << e.what() << std::endl;
    }

    catch( curlpp::LogicError &e )
    {
        std::cout << e.what() << std::endl;
    }

  return 0;
}

更新:

在 Easy.cpp 中:

void 
curlpp::Easy::perform()
{
    mCurl->perform(); // The exception come from here. mCurl is a std::auto_ptr<internal::CurlHandle> mCurl;
}

......

std::ostream & operator<<(std::ostream & stream, const curlpp::Easy & request)
{
  // Quick clone that doesn't copy options, only the curl handle.
  curlpp::Easy r(request.getCurlHandle().clone());
  r.setOpt(new curlpp::options::WriteStream(& stream));
  r.perform(); // The exception come from here.

  return stream;
}

在 CurlHandle.cpp 中:

void CurlHandle::perform()
{
    CURLcode code;

    code = curl_easy_perform(mCurl);
    throwException();
    libcurlRuntimeAssert(mErrorBuffer, code); //if we got an error
}

在 Exception.cpp 中:

void curlpp::libcurlRuntimeAssert(const std::string & reason, CURLcode code)
{
  curlpp::libcurlRuntimeAssert(reason.c_str(), code);
}

void curlpp::libcurlRuntimeAssert(const char * reason, CURLcode code)
{
  if (code != CURLE_OK)
    throw curlpp::LibcurlRuntimeError(reason, code);
}

我追到了代码，throw curlpp::LibcurlRuntimeError(reason, code);，LibcurlRuntimeError的构造函数没问题，然后throw，然后SIGABRT。

堆栈跟踪:

0   __kill      0   0x7fff8213d0b6  
1   abort       0   0x7fff821dd9f6  
2   uw_init_context_1       0   0x101663af2 
3   _Unwind_Resume      0   0x101663f38 
4   operator<<  Easy.cpp    118 0x10009b699 
5   operator<<  Options.cpp 34  0x1000948d8 
6   RoleCreationTest::loadPlayerAsyncTestCase   rolecreationtest.cpp    147 0x10008c714 
7   RoleCreationTest::qt_metacall   moc_rolecreationtest.cpp    87  0x1000acab2 
8   QMetaMethod::invoke     0   0x1012e6667 

Answer 1

各种 MacPorts GCC 4.x 编译器和异常捕获都存在问题，参见示例 GCC bug 42159和 MacPorts bug 25042 .