Why is std::stoi not working with MinGW 4.6.1 on Windows?

Compilation Error with std::stoi in MinGW 4.6.1

When attempting to compile a program using std::stoi in MinGW 4.6.1, an error message indicating that 'stoi' is not a member of 'std' may appear. This issue stems from a non-standard declaration of vswprintf on Windows.

Cause of the Issue

The GNU Standard Library defines the macro _GLIBCXX_HAVE_BROKEN_VSWPRINTF on Windows, which disables the conversion functions, including std::stoi. This macro is enabled when using MinGW on Windows due to an issue with vswprintf on that platform.

Resolving the Issue

To resolve this issue, consider the following workaround:

1. Modify MinGW Header Files (Not Recommended):

   • Remove the !defined(_GLIBCXX_HAVE_BROKEN_VSWPRINTF) macro on line 2754 of .../lib/gcc/mingw32/4.6.1/include/c /bits/basic_string.h.
   • Add the macro back around lines 2905 to 2965, which reference std::vswprintf.

   This modification will disable the std::to_wstring functions, but other conversion functions should become available.

Additional Information

• For more details on the issue, refer to the GNU Bugzilla report: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37522.
• This workaround may not be suitable for all users and should be implemented with caution.

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