exern (C) linkage problem

[bearophile]

> typedef char* Cstring;
> extern(C) Cstring strcmp(Cstring s1, Cstring s2);
> ...

You can use just a struct too:

import std.string: toStringz;

struct Cstring {
    const(char)* ptr;
}

extern(C) Cstring strcmp(Cstring s1, Cstring s2);

Cstring toCString(T)(T[] s) {
    return Cstring(toStringz(s));
}
void main() {
    auto s1 = "abba";
    auto s2 = "red";
    // auto r = strcmp(toCString(s1), s2); // compile error
    auto r = strcmp(toCString(s1), toCString(s2)); // OK
}

Bye,
bearophile