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struct X { int *p; } x; struct X __attribute__((noinline)) foo(int *p) { struct X x; x.p = p; return x; } void __attribute((noinline)) bar() { *x.p = 1; } extern void abort (void); int main() { int i = 0; x = foo(&i); bar(); if (i != 1) abort (); return 0; }