FYI: GDB has a big bug to support MinGW GCC (4.7.x and later)

[ollydbg]

I just noticed that GDB has this bug: (the reasons are also shown in this bug report)
Bug 15559 – Method call and calling convention

This prevent you using a "inferior call" on the GDB, such as "p v[0]" or "p v.size()".

Test sample code below:

Code Select Expand


#include <string>
#include <vector>

int fff()
{
   return 3;
}

int main()
{
   std::vector<std::string> v;
   v.push_back("a");
   v.push_back("b");
   std::string abc = v[0];
   abc.c_str();
   abc.size();
   int i = v.size();
   i++;
   i = fff();
   return 0;      
}


If you set a breakpoint in the "return 0" line, then you try to see watch some values like "v[0]" or "v[1]", also you can enter "p abc.size()", "p abc.c_str()", "p v[0]", you will get wrong result or error in GDB.

GCC 4.6.x and earlier version don't cause such issue.

[ollydbg]

I have post a new release for MinGW GDB to fix this issue, see: [OT] unofficial MinGW GDB gdb with python released.