node.js - Undefined symbol when Calling function in C++ Random Char added -

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in nodejs i'm building interface shared object in c. have following code:

#include <node.h> #include "libcustom_encryption.h"  namespace demo {      using v8::exception;     using v8::functioncallbackinfo;     using v8::isolate;     using v8::local;     using v8::number;     using v8::object;     using v8::string;     using v8::value;      //     //  implementation of "add" method     //  input arguments passed using     //  const functioncallbackinfo<value>& args struct     //     void devicegetversion(const functioncallbackinfo<value>& args)     {         char ver[10] = {0};         unsigned int ver_size = 0;          device_get_version(ver, ver_size);          isolate* isolate = args.getisolate();          //         //  1.  save value in isolate thing         //         local<value> str = string::newfromutf8(isolate, "test");          //         //  2.  set return value (using passed in         //      functioncallbackinfo<value>&)         //         args.getreturnvalue().set(str);     }       void init(local<object> exports)     {         node_set_method(exports, "devicegetversion", devicegetversion);     }      node_module(addon, init) }
  • node-gyp configure: works
  • node-gyp build: works
  • ld_library_path=libs/ node index.js: doesn't work

i following error:

node: symbol lookup error: /long_path/build/release/app.node: undefined symbol: _z18device_get_versionpcs_phj

the when function called gets prepended , appended random characters. i'm assuming random data noise memory. seams if size brakes call function bigger should.

i'm not experienced mixing c++ , c, love explanation on happening hear.

tech specs:

  • gcc version: gcc version 4.8.5 20150623 (red hat 4.8.5-4) (gcc)
  • nodejs version: v6.2.0

the function called gets prepended , appended random characters

it called name mangling happens in c++.

the actual error here compiled module can not link function device_get_version().

your possible actions:

  • add implementation of device_get_version module
  • properly link function
  • simply remove line , error disappear

upd.
device_get_version may c function treated c++ function (you can tell mangled name has). make sure function declared 

extern "c" {     void device_get_version(...); }

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