Basically all commonly used languages support this nowadays. Even ones you might not expect like C++ and C# have added it. The only major exceptions that come to mind are C and Java.
replyYou have been able to return a struct by value in C since at least C89:
reply typedef struct {
double d;
int err;
} Ret;
Ret foo(void) {
Ret r = { 0.0, 43};
return r;
}
int main() {
Ret r = foo();
}