how to disable __thiscall on MinGW-gcc-4.7.x ?

[niXman]

Hello list!

According to the changes in the gcc-4.7.0 [1]: Windows x86 targets are
using the __ thiscall calling convention for C++ class-member
functions.

The question is how to disable this?

Thanks.

[1] http://gcc.gnu.org/gcc-4.7/changes.html


-- 
Regards,
  niXman