Problem with dynamic library (Linux)

bar.c

#include "foo.h"

int main(int argc, char** argv) {
  foo();
}

foo.nim

import logging

# Uncommenting this circumvents the problem
# {.emit:"""
#   int cmdCount;
#   const char* cmdLine[0];
# """.}

proc foo*() {.exportc, dynlib, cdecl.} =
  echo "in foo"

test.sh

set -e
nim c --app:lib --header --forceBuild --passC:-fPIC foo.nim
gcc -o bar -L . -I nimcache -I ~/work/nim/lib bar.c -l foo
LD_LIBRARY_PATH=. ./bar

the output

./libfoo.so: undefined reference to `cmdCount'
./libfoo.so: undefined reference to `cmdLine'
collect2: error: ld returned 1 exit status