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XC++STL C++调试错误编译错误

runtime-error macos xcode c++

Brock Woolf · 技术社区 · 16 年前

代码:

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

using namespace std;

int main (int argc, char * const argv[]) {
    string cppfilename; 
    std::cout << "Please enter the filename to create: ";

    while ( cppfilename == "" ) {
        getline(cin, cppfilename);    // error occurs here
    }

    cppfilename += ".txt";
    ofstream fileout;
    fileout.open( cppfilename.c_str() );
    fileout << "Writing this to a file.\n"; 
    fileout.close();

    return 0;
}

Please enter the filename to create: Runningâ¦
myfile
FileIO(5403) malloc: *** error for object 0xb3e8: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Created: myfile.txt

发布输出:

FileIO implementation C++
Please enter the filename to create: Runningâ¦
myfile
Created: myfile.txt

我将代码分解为以下内容,但仍然存在错误:

 string cppfilename; 
 getline(cin, cppfilename);    // error here

2 回复 | 直到 16 年前

Community Mohan Dere 9 年前

_GLIBCXX_DEBUG being broken with gcc 4.2 on Mac OS X .

Brian Campbell Dennis Williamson 16 年前

libstdc++ ,至少在调试模式下编译时。如果我编译您上面给出的两行缩减:

#include <iostream>
#include <string>

using namespace std;

int main() {
  string cppfilename; 
  getline(cin, cppfilename);    // error here

  return 0;
}

使用以下命令行(在C++项目中,使用XCODE对调试生成的默认设置进行定义):

g++ -D_GLIBCXX_DEBUG=1 -D_GLIBCXX_DEBUG_PEDANTIC=1 -g -o getline getline.cpp

然后我得到了与您看到的相同的错误:

$ ./getline foo
getline(74318) malloc: *** error for object 0x1000021e0: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap

这会弹出一个崩溃报告,它会给我们一个堆栈跟踪(您也可以通过在Xcode下运行它从调试器获得堆栈跟踪;我只是想在尽可能干净的环境中复制它,尝试隔离原因,而不需要任何其他奇怪的Xcode操作):

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   libSystem.B.dylib               0x00007fff83c37fe6 __kill + 10
1   libSystem.B.dylib               0x00007fff83cd8e32 abort + 83
2   libSystem.B.dylib               0x00007fff83bf0155 free + 128
3   libstdc++.6.dylib               0x00007fff813e01e8 std::string::reserve(unsigned long) + 90
4   libstdc++.6.dylib               0x00007fff813e0243 std::string::push_back(char) + 63
5   libstdc++.6.dylib               0x00007fff813c92b5 std::basic_istream<char, std::char_traits<char> >& std::getline<char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, char) + 277
6   getline                         0x00000001000011f5 std::basic_istream<char, std::char_traits<char> >& std::getline<char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&) + 64 (basic_string.h:2451)
7   getline                         0x0000000100000cbf main + 34 (getline.cpp:10)
8   getline                         0x0000000100000c04 start + 52

在这一点上,如果我们使用的是专利软件(苹果的大部分软件都是专利软件,但幸运的是 file a bug report with our vendor ,并尝试找到解决方法。幸运的是,这是免费软件,所以我们可以调查根本原因。不幸的是,我现在没有时间追根究底,但是 source is available 供阅读。

file a bug about this . 这种情况下的一个解决方法是删除_GLIBCXX_DEBUG=1定义(可能还有_GLIBCXX_DEBUG_PEDANTIC=1)。您可以在Xcode中找到您的目标,双击它构建的可执行文件,转到build选项卡,确保配置设置为Debug,向下滚动到 GCC 4.2-预处理 节,并从 预处理宏