thread_local!s with destructors segfault in non-PIE executables

[huonw]

void foo();
int main()
{
    foo();
    return 0;
}

#![crate_type = "staticlib"]

struct Destroy;
impl Drop for Destroy { fn drop(&mut self) {} }

thread_local! {
    static X: Destroy = Destroy
}

#[no_mangle]
pub extern "C" fn foo() {
    X.with(|_| ());
}

rustc staticlib2.rs
gcc staticlib2.c libstaticlib2.a -ldl -lpthread -lrt -lgcc_s -lpthread -lc -lm -o staticlib2
gcc staticlib2.c -pie libstaticlib2.a -ldl -lpthread -lrt -lgcc_s -lpthread -lc -lm -o staticlib2-pie

staticlib2 segfaults, staticlib2-pie doesn't.

This is possibly/probably the expected behaviour, but it would be quite nice to not cause a segfault or at least find some way to help the user get it right. (cc http://stackoverflow.com/q/29632715/1256624)