Symbol collision in Julia

build.sh

gcc -Wall -fPIC -O3 -c test_move.c
gcc -shared -Wl,-soname,libtest_move.so -o libtest_move.so test_move.o
gcc -o test_move test_move.c

test_move.c

#include <stdio.h>

int foo;
int move[10000];

void test_move()
{
  printf("foo: %p\nmove: %p\n", &foo, move);
  move[9999] = 13;
}

int main(int argc, char **argv)
{
  test_move();
  return 0;
}

test_move.jl

lib_test_move = dlopen("./libtest_move.so")
test_move = dlsym(lib_test_move, :test_move)
println("foo: ", dlsym(lib_test_move, :foo))
println("move: ", dlsym(lib_test_move, :move))
ccall(test_move, Void, ())

test_move2.jl

main_program = ccall(:jl_load_dynamic_library, Ptr{Void}, (Ptr{Uint8},), 0)
lib_test_move = dlopen("./libtest_move.so")
test_move = dlsym(lib_test_move, :test_move)
println("foo: ", dlsym(lib_test_move, :foo))
println("move: ", dlsym(lib_test_move, :move))
println("main_program move: ", dlsym(main_program, :move))
ccall(test_move, Void, ())

test_move3.jl

libdl = dlopen("/usr/lib/x86_64-linux-gnu/libdl.so")

function dlopen2(lib)
  # From bits/dlfcn.h
  const RTLD_LAZY = 0x00001
  const RTLD_DEEPBIND = 0x00008
  flags = RTLD_LAZY | RTLD_DEEPBIND
  ccall(dlsym(libdl, :dlopen), Ptr{Void}, (Ptr{Uint8}, Int32), lib, flags)
end

function dlsym2(lib, sym)
  ccall(dlsym(libdl, :dlsym), Ptr{Void}, (Ptr{Void}, Ptr{Uint8}), lib, sym)
end

lib_test_move = dlopen2("./libtest_move.so")
test_move = dlsym2(lib_test_move, :test_move)
println("foo: ", dlsym2(lib_test_move, :foo))
println("move: ", dlsym2(lib_test_move, :move))
ccall(test_move, Void, ())