Crash due to the uncertain destroying order of static variables

[zjx20]

I had encountered a reproducible crash issue.

My testing environment is mac osx 10.9.5 with xcode 6 and clang-600.0.5.
Here is the test code (copied from README):

#include "benchmark/benchmark.h"

static void BM_StringCreation(benchmark::State& state) {
  while (state.KeepRunning())
    std::string empty_string;
}

// Register the function as a benchmark
BENCHMARK(BM_StringCreation);

// Define another benchmark
static void BM_StringCopy(benchmark::State& state) {
  std::string x = "hello";
  while (state.KeepRunning())
    std::string copy(x);
}
BENCHMARK(BM_StringCopy);

int main(int argc, const char** argv) {
//  BENCHMARK(BM_StringCreation);
//  BENCHMARK(BM_StringCopy);
  benchmark::Initialize(&argc, argv);
  benchmark::RunSpecifiedBenchmarks();
  return 0;
}

At the end of the execution for everytime, a crash message shows up:

Reading /proc/self/cputime_ns failed. Using getrusage().
Benchmarking on 4 X 1000 MHz CPUs
2014/10/05-11:41:53
DEBUG: Benchmark           Time(ns)    CPU(ns) Iterations
---------------------------------------------------------
DEBUG: BM_StringCreation         14         28   18115649                                  
DEBUG: BM_StringCopy              9         23   22298993                                  
libc++abi.dylib: terminating with uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument
Abort trap: 6

When I move BENCHMARK() lines into main(), the issue disappeared.

I debugged this issue for a few hours, and then I realized that the problem is: the static std::mutex benchmark_mutex has been destroyed before static BenchmarkFamilies instance. The destructor of Benchmark calls BenchmarkFamilies::RemoveBenchmark(), but the mutex already invalid, and then it just crashes.

[zjx20]

Update: the issue is link-order related

# crash
g++ -o test_bench test_bench.cpp -Wall -Wextra --std=c++11 -lbenchmark

# ok
g++ -lbenchmark -o test_bench test_bench.cpp -Wall -Wextra --std=c++11