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当我使用 Crystax ndk 构建 Ceres-Solver 时,我更改了

APP_STL := c++_static

APP_STL := gnustl_static

因为 gnustl_static 与 android 上的 OpenCV 兼容,所以我有 libceres.a,我将它复制到项目 jni 文件夹并将以下行添加到 Applications.mk

然后我使用 Crystax ndk 运行 ndk-build(我将 Crystax 文件夹添加到系统路径)

LOCAL_LDLIBS += libceres.a
LOCAL_SRC_FILES += Test.cpp

使用 Ceres 的 test.cpp 的一部分如下:

struct CostFunctor {
   template <typename T>
   bool operator()(const T* const x, T* residual) const {
     residual[0] = T(10.0) - x[0];
     return true;
   }
};

int main(int argc, char** argv) {

  double x = 0.5;
  const double initial_x = x;

  Problem problem;

  CostFunction* cost_function =
      new AutoDiffCostFunction<CostFunctor, 1, 1>(new CostFunctor);
  problem.AddResidualBlock(cost_function, NULL, &x);

  Solver::Options options;
  options.minimizer_progress_to_stdout = true;
  Solver::Summary summary;
  Solve(options, &problem, &summary);

  return 0;
}

然后事情就出错了(发出的错误信息越多):

/home/panxiaoyu/ceres-solver/jni/../internal/ceres/miniglog/glog/logging.h:174: error: undefined reference to 'std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::basic_stringstream(std::_Ios_Openmode)'

/opt/crystax-ndk/sources/cxx-stl/gnu-libstdc++/5/include/bits/basic_string.h:544: error: undefined reference to 'std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >::~basic_stringstream()'

/opt/crystax-ndk/sources/cxx-stl/gnu-libstdc++/5/include/sstream:766: error: undefined reference to 'std::__cxx11::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::str() const'

哪里错了?

是我的 ndk 配置错误还是 Crystax 有错误?

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