c++ - 在macOS High Sierra上使用node-gyp在动态链接wfdb库时未加载符号

我试图创建一个依赖WFDB库(https://www.physionet.org/physiotools/wfdb.shtml)的动态库。
我的C++代码如下所示:

#include <stdio.h>
#include <iostream>
#include <vector>
#include <vector>
extern "C" {
    #include <wfdb/wfdb.h>
}

#include "./sample_wfdb.h"

int add(int a, int b){
    return a + b;
}

int read(){
    int i, nsig;
    WFDB_Siginfo* siarray;
    WFDB_Sample* v;
    nsig = isigopen("/data/100s", NULL, 0);
    if (nsig < 1)
        exit(1);
    siarray = (WFDB_Siginfo*)malloc(nsig * sizeof(WFDB_Siginfo));
    nsig = isigopen("data/100s", siarray, nsig);
    for (i = 0; i < nsig; i++)

        v = (WFDB_Sample*)malloc(nsig * sizeof(WFDB_Sample));

    if (v == NULL) {
        fprintf(stderr,"%s: insufficient memory\n");
        exit(2);
    }
    std::vector<int> signal1, signal2;
    for (int i = 0; i < siarray[0].nsamp; i++) {
        if (getvec(v) < 0)
            break;
        for (int j = 0; j < nsig; j++) {
            if (j == 0) {
                signal1.push_back(v[j]);
            }
            if (j == 1) {
                signal2.push_back(v[j]);
            }
        }
    }
    int sig_size = signal1.size();
    std::cout << sig_size << std::endl;
    return sig_size;
}

头文件如下

#ifdef __linux__
  extern "C" int read();
  extern "C" int add(int x, int y);
#elif _WIN32
  extern "C" __declspec(dllexport) extern "C" int read();
  extern "C" __declspec(dllexport) int add(int x, int y);
#elif __APPLE__
  extern "C" int read();
  extern "C" int add(int x, int y);
#endif

绑定(bind)。 gyp是

{
  "targets": [
    {
      "target_name": "wfdb-test",
      "type": "shared_library",
      "libraries": [ "/usr/local/lib/libwfdb.10.6.0.dylib"] ,
      "sources": [ "sample_wfdb.cpp -lwfdb" ],
      "cflags!": [ "-fno-exceptions" ],
      "cflags": [ "-std=c++11" ],
      "cflags_cc!": [ "-fno-exceptions" ]
    }
  ]
}

使用运行该项目时，请使用node-gyp重建。我得到以下输出。

gyp info it worked if it ends with ok
gyp info using [email protected]
gyp info using [email protected] | darwin | x64
gyp info spawn /usr/local/bin/python2
gyp info spawn args [ '/usr/local/lib/node_modules/node-gyp/gyp/gyp_main.py',
gyp info spawn args   'binding.gyp',
gyp info spawn args   '-f',
gyp info spawn args   'make',
gyp info spawn args   '-I',gyp info spawn args   '/Users/abhinashkumarjha/Desktop/cpp-codes/build/config.gypi',
gyp info spawn args   '-I',gyp info spawn args   '/usr/local/lib/node_modules/node-gyp/addon.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/Users/abhinashkumarjha/.node-gyp/8.11.3/include/node/common.gypi',
gyp info spawn args   '-Dlibrary=shared_library',
gyp info spawn args   '-Dvisibility=default',
gyp info spawn args   '-Dnode_root_dir=/Users/abhinashkumarjha/.node-gyp/8.11.3',
gyp info spawn args   '-Dnode_gyp_dir=/usr/local/lib/node_modules/node-gyp',
gyp info spawn args   '-Dnode_lib_file=/Users/abhinashkumarjha/.node-gyp/8.11.3/<(target_arch)/nod
e.lib',
gyp info spawn args   '-Dmodule_root_dir=/Users/abhinashkumarjha/Desktop/cpp-codes',
gyp info spawn args   '-Dnode_engine=v8',
gyp info spawn args   '--depth=.',
gyp info spawn args   '--no-parallel',
gyp info spawn args   '--generator-output',
gyp info spawn args   'build',
gyp info spawn args   '-Goutput_dir=.' ]
gyp info spawn make
gyp info spawn args [ 'BUILDTYPE=Release', '-C', 'build' ]
  SOLINK(target) Release/wfdb-test.dylib
gyp info ok

并在./build/Release/wfdb-test.dylib下生成一个动态库

在通过以下方式在生成的dylib文件中查找符号时:

nm -a build/Release/wfdb-test.dylib

我明白了

U dyld_stub_binder

这是默认的cpp符号(我希望在这里有更多符号。)。谁能帮我解决我的问题。

开发环境的详细信息是:

os: mac OS High Sierra ( v10.13.6 )
node: v8.11.3
node-gyp: v3.8.0

最佳答案

如果这看起来很愚蠢，请原谅我，但是main()函数在哪里？代码是否还有另一个入口点？

Is it possible to write a program without using main() function?

另外，带有标志!和cflags_cc!设置为-fno-exceptions，是否有可能整个编译过程都没有抛出适当的异常？

https://blog.mozilla.org/nnethercote/2011/01/18/the-dangers-of-fno-exceptions/

关于c++ - 在macOS High Sierra上使用node-gyp在动态链接wfdb库时未加载符号，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/51907318/