Warning detected as error when compiling unused variables in function templates

Although the build is successful, when compiling the following code with MinGW I get the Build Issues listing a red mark for the unused variable i inside the function template (please see attachment). With a non-template function the behavior is as expected. Note: The problem doesn't happen with the MSVC toolchain.

template <class T>
inline void g()

inline void f()

int main(int argc, char *argv[])
{
f();
g<int>();

return 0;
}