无法编译mongo-c-driver示例

Question

我尝试编写简单的mongo c客户端.源文件(ac):

#include <stdio.h>
#define MONGO_HAVE_STDINT
#include <mongo.h>

void mongo_init_c(mongo *con)
{
  mongo_init(con);
}

int main() {
  return 0;
}

我尝试编译它:

gcc -I/usr/local/include -L/usr/local/lib -lmongoc a.c

但得到一个错误:

a.c:(.text+0xd): undefined reference to `mongo_init'

文件/usr/local/include/mongo.h和/usr/local/lib/libmongoc.so存在

我怎样才能正确编译ac？

ps mongo-2.0.4,gcc-4.6,mongo-c-driver - 从github拉出来

更新

$ nm /usr/local/lib/libmongoc.so | grep init

000034e0 T _init
0000dd10 T bson_init
0000c740 T bson_init_data
0000c7b0 T bson_init_finished_data
0000dc10 T bson_init_size
0000d060 T bson_iterator_init
0000a5e0 T gridfile_init
00009af0 T gridfile_writer_init
000095e0 T gridfs_init
00010a18 R initialBufferSize
00005f40 T mongo_cursor_init
00008da0 T mongo_env_sock_init
00005d90 T mongo_init
000057b0 T mongo_init_sockets
00004800 T mongo_md5_init
00005e40 T mongo_replica_set_init
00005f00 T mongo_replset_init
00005b80 T mongo_write_concern_init

$ gcc -I/usr/local/include -L/usr/local/lib -Wall -Werror -lmongoc ac

/tmp/cccuNEp1.o: In function `mongo_init_c':
a.c:(.text+0xd): undefined reference to `mongo_init'

Answer 1

尝试在源文件之后链接库,比如gcc a.c -lmongoc.这是因为您使用的是传统的单通道链接器,它希望满足与命令行中指定的后续而非先前对象的依赖关系.