The following simple code segfaults under gcc 4.4.4

#include<stdio.h>

typedef struct Foo Foo;
struct Foo {
    char f[25];
};

Foo foo(){
    Foo f = {"Hello, World!"};
    return f;
}

int main(){
    printf("%s\n", foo().f);
}

Changing the final line to

 Foo f = foo(); printf("%s\n", f.f);

Works fine. Both versions work when compiled with -std=c99. Am I simply invoking undefined behavior, or has something in the standard changed, which permits the code to work under C99? Why does is crash under C89?

c linux gcc language-lawyer
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