Question

I’m trying to use std:getline() but getting a strange runtime error:

malloc: * error for object 0x10000a720: pointer being freed was not allocated
* set a breakpoint in malloc_error_break to debug

This is the code that produces this error:

//main.cpp
#include <iostream>
#include <sstream>

int main (int argc, char * const argv[])
{
   std::istringstream my_str("demo string with spaces");
   std::string word;

   while (std::getline(my_str, word, ' ')) {
        std::cout << word << std::endl;
   }
   return 0;
}

Before each word I get this error. From the comments it seems to be a OSX/XCode specific error. Any hints on that?

Update:
The error is only printed in Debug mode. If I build this code in Release mode everything is fine.

Update 2:
More info on that issue can be found here.

Solution:

Set

_GLIBCXX_FULLY_DYNAMIC_STRING=1

in your Preprocessor Macros in targets info build tab.

System info:

OSX 10.6.2 | XCode 3.2 | g++ 4.2 | debug config for i386

Answer 1

At least one person has reported problems with g++ 4.2.1 on Apple that seem possibly related to yours having to do with an improper configuration of the standard library with the _GLIBCXX_FULLY_DYNAMIC_STRING definition (not that I understand any of what I’m typing here).

You might get a bit of a clue from the newsgroup thread that includes this message:

• http://gcc.gnu.org/ml/gcc-bugs/2009-10/msg00807.html