Question

我使用mongodb网站的示例代码来显示问题。 OS：ArchLiux，c ++是g ++的链接

[dean @ dell_xps_13~] $ c ++ --version c ++（GCC）6.2.1 20160830版权所有（C）2016 Free Software Foundation，Inc。这是免费软件;看到了复制条件的来源。没有保修;甚至没有适销性或适用于特定目的。

代码在test.cc文件中

#include <iostream>

#include <bsoncxx/builder/stream/document.hpp>
#include <bsoncxx/json.hpp>

#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>

int main(int, char**) {
  mongocxx::instance inst{};
  mongocxx::client conn{mongocxx::uri{}};

  bsoncxx::builder::stream::document document{};

  auto collection = conn["testdb"]["testcollection"];
  document << "hello" << "world";

  collection.insert_one(document.view());
  auto cursor = collection.find({});

  for (auto&& doc : cursor) {
    std::cout << bsoncxx::to_json(doc) << std::endl;
  }
}

首先将其编译为目标文件：

c ++ -g -std = c ++ 11 -I ../ include -I / usr / include / bsoncxx / v_noabi -I / usr / include / mongocxx / v_noabi -Wall -o test.o -c ./test.cc

链接它没有-static作品：

c ++ test.o -o test -static-libgcc -static-libstdc ++ -L / usr / lib -lpthread -lmongocxx -lbsoncxx -lboost_log -lboost_log_setup -lboost_system -lboost_thread -lboost_filesystem

这可以运行并打印出一些消息：

[dean@dell_xps_13 mongo-cxx-driver-r3.0.2]$ ./test
{
    "_id" : {
        "$oid" : "58218e821b489308ae4411d1"
    }, 
    "hello" : "world"
}

现在使用-static选项

获得错误

c ++ test.o -o test -static-libgcc -static-libstdc ++ -static -L / usr / lib -lpthread -lmongocxx -lbsoncxx -lboost_log -lboost_log_setup -lboost_system -lboost_thread -lboost_filesystem

下面显示了许多错误消息：

/usr/lib/libmongocxx.a(client.cpp.o）：在函数中 mongocxx::v_noabi::client::client(mongocxx::v_noabi::uri const&, mongocxx::v_noabi::options::client const&)': /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x28): undefined reference to mongoc_client_new_from_uri＆＃39; /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x10c）：未定义引用mongoc_client_destroy' /usr/lib/libmongocxx.a(client.cpp.o): In function mongocxx :: v_noabi :: client :: operator =（mongocxx :: v_noabi :: client＆amp;＆amp;）＆＃39;： /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x190）：未定义引用mongoc_client_destroy' /usr/lib/libmongocxx.a(client.cpp.o): In function mongocxx :: v_noabi :: client :: ~client（）＆＃39;： /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x1c3）：未定义引用mongoc_client_destroy' /usr/lib/libmongocxx.a(client.cpp.o): In function mongocxx :: v_noabi :: client :: read_concern（mongocxx :: v_noabi :: read_concern）＆＃39;： /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x214）：未定义引用mongoc_client_set_read_concern' /usr/lib/libmongocxx.a(client.cpp.o): In function mongocxx :: v_noabi :: client :: read_concern（）const＆＃39;： /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x243）：未明确引用mongoc_client_get_read_concern' /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x24b): undefined reference to mongoc_read_concern_copy＆＃39; /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x27c）：未明确引用mongoc_read_concern_destroy' /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x2a3): undefined reference to mongoc_read_concern_destroy＆＃39; /usr/lib/libmongocxx.a(client.cpp.o）：在功能上 mongocxx::v_noabi::client::read_preference(mongocxx::v_noabi::read_preference)': /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x3a4): undefined reference to mongoc_client_set_read_prefs＆＃39; /usr/lib/libmongocxx.a(client.cpp.o）：在功能上 mongocxx::v_noabi::client::read_preference() const': /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x3c3): undefined reference to mongoc_client_get_read_prefs＆＃39; /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x3cb）：未明确引用mongoc_read_prefs_copy' /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x3fc): undefined reference to mongoc_read_prefs_destroy＆＃39; /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x423）：未定义引用mongoc_read_prefs_destroy' /usr/lib/libmongocxx.a(client.cpp.o): In function mongocxx :: v_noabi :: client :: uri（）const＆＃39;： /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x463）：未明确引用mongoc_client_get_uri' /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x46b): undefined reference to mongoc_uri_copy＆＃39; /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x49c）：未明确引用mongoc_uri_destroy' /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x4c3): undefined reference to mongoc_uri_destroy＆＃39; /usr/lib/libmongocxx.a(client.cpp.o）：在功能上 mongocxx::v_noabi::client::write_concern(mongocxx::v_noabi::write_concern)': /home/dean/work/github/mongo-cxx-driver/src/mongocxx/client.cpp:(.text+0x504): undefined reference to mongoc_client_set_write_concern＆＃39; /usr/lib/libmongocxx.a(client.cpp.o）：在功能上 `mongocxx :: v_noabi :: client :: write_concern（）const＆＃39;：

...

/usr/lib/libbsoncxx.a(oid.cpp.o）：在功能上 bsoncxx::v_noabi::oid::to_string[abi:cxx11]() const': /home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x139): undefined reference to bson_oid_to_string＆＃39; /usr/lib/libbsoncxx.a(oid.cpp.o）：在功能上 bsoncxx::v_noabi::oid::get_time_t() const': /home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x1ea): undefined reference to bson_oid_get_time_t＆＃39; /usr/lib/libbsoncxx.a(oid.cpp.o）：在功能上 bsoncxx::v_noabi::oid_compare(bsoncxx::v_noabi::oid const&, bsoncxx::v_noabi::oid const&)': /home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x24f): undefined reference to bson_oid_compare＆＃39; /usr/lib/libbsoncxx.a(oid.cpp.o）：在功能上 bsoncxx::v_noabi::operator<(bsoncxx::v_noabi::oid const&, bsoncxx::v_noabi::oid const&)': /home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x2af): undefined reference to bson_oid_compare＆＃39; /usr/lib/libbsoncxx.a(oid.cpp.o）：在功能上 bsoncxx::v_noabi::operator>(bsoncxx::v_noabi::oid const&, bsoncxx::v_noabi::oid const&)': /home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x30f): undefined reference to bson_oid_compare＆＃39; /usr/lib/libbsoncxx.a(oid.cpp.o）：在功能上 bsoncxx::v_noabi::operator<=(bsoncxx::v_noabi::oid const&, bsoncxx::v_noabi::oid const&)': /home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x36f): undefined reference to bson_oid_compare＆＃39; /usr/lib/libbsoncxx.a(oid.cpp.o）：在功能上 bsoncxx::v_noabi::operator>=(bsoncxx::v_noabi::oid const&, bsoncxx::v_noabi::oid const&)': /home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x3cf): undefined reference to bson_oid_compare＆＃39; /usr/lib/libbsoncxx.a(oid.cpp.o):/home/dean/work/github/mongo-cxx-driver/src/bsoncxx/oid.cpp:(.text+0x42f）：更多未定义的引用`bson_oid_compare＆＃39;关注collect2：错误：ld返回1退出状态

Answer 1

-static标志强制链接器只接受静态库，而不接受任何共享库。换句话说，它不需要在运行时依赖动态库来运行。最有可能mongocxx有一些依赖关系。要实现静态链接，需要在系统上存在库的存档（.a）版本。

另一个可能的问题是链接器命令行中的静态库的顺序很重要，因此如果存在对不同静态库的依赖性，这也可能是一个问题。链接器将按顺序处理库，因为它们位于命令行中，并且每个静态库只会提取所需的符号（具有链接器当时具有的信息）

使用nm。这将为您提供符号名称。

g ++不能静态链接libmongcxx（r3.0.2），但动态链接有效

1 个答案: