c - 我在编译 c 使用 mongodb c 驱动程序时遇到错误 "undefined reference to ` mongo_client'"

Question

这是演示代码，我用它来测试一切是否正常

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

int main()
{
   mongo conn[1];
   int status = mongo_client( conn, "127.0.0.1", 27017 );

   if( status != MONGO_OK ) {
      switch ( conn->err ) {
         case MONGO_CONN_NO_SOCKET:
             printf( "no socket\n" );
             return 1;
         case MONGO_CONN_FAIL:
             printf( "connection failed\n" );
             return 1;
         case MONGO_CONN_NOT_MASTER:
             printf( "not master\n" );
             return 1;
      }
   }
   printf( "connection done\n");

   mongo_destroy( conn );

   return 0;
}

这里是编译错误信息，不知道为什么，找不到mongo驱动？

# cc --std=c99 demo.c -o demo
/tmp/ccucuugp.o: In function `main':
demo.c:(.text+0x2e): undefined reference to `mongo_client'
demo.c:(.text+0xc2): undefined reference to `mongo_destroy'
collect2: ld returned 1 exit status

有人可以帮忙吗？

Answer 1

我明白了，通过执行此程序

# echo '/usr/local/lib/' > /etc/ld.so.conf.d/mongoc.conf
# ldconfig
# gcc -lmongoc --std=c99 demo.c -o demo