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// foo.h

struct foo {
  float f;
  union { int x; };
};

int foo(struct foo);

// foo.c

#include "foo.h"

int foo(struct foo in) {
  return in.x;
}

// test.c

#include "foo.h"

int printf(const char *, ... );

int main() {
  printf("%d\n", foo((struct foo){1, 2}));
  return 0;
}

./rvcc foo.c -S -o foo.s
riscv64-unknown-linux-gnu-gcc foo.s test.c
qemu-riscv64 a.out # print 0

riscv64-unknown-linux-gnu-gcc foo.c test.c
qemu-riscv64 a.out # print 2