Best way to deal with a trailing comma when using X macros in C++

What's the best way to deal with extra trailing commas when working with X macros? Specifically, I have the following setup in a file test01.cpp

struct Foo {
    #define X(name,val) int name;
    #include "test01.def"
    #undef X

    Foo() :
        #define X(name,val) name(val),
        #include "test01.def"
        #undef X
    {}
};

int main(){
    Foo foo;
}

In test01.def, I have

X(foo,1)
X(bar,23)

This doesn't compile because of the error

test01.cpp: In constructor 'Foo::Foo()':
test01.cpp:10:5: error: expected identifier before '{' token
     {}

Basically, there's a trailing comma after the last element in the member initializer list. Now, we can fix this by adding a dummy variable:

struct Foo {
private:
    void * end;
public:
    #define X(name,val) int name;
    #include "test01.def"
    #undef X

    Foo() :
        #define X(name,val) name(val),
        #include "test01.def"
        #undef X
        end(nullptr)
    {}
};

int main(){
    Foo foo;
}

However, this is sort of ugly. As such, is there a better way to handle the trailing comma in the member initializer list?