在MacOS上开始使用rocksdb

Question

我跟着guide并做了：

brew install rocksdb

我被困在这里。我该怎么做才能使用rocksdb？

我复制了this example file的内容并试图在Mac OS上使用gcc-5（brew）和gcc（clang）编译它，但它们都返回错误。我在Mac OS 10.11.5上使用Xcode 7.3.1。

错误是：

Undefined symbols for architecture x86_64:
  "_rocksdb_backup_engine_close", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_backup_engine_create_new_backup", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_backup_engine_open", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_backup_engine_restore_db_from_latest_backup", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_close", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_get", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_open", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_options_create", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_options_destroy", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_options_increase_parallelism", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_options_optimize_level_style_compaction", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_options_set_create_if_missing", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_put", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_readoptions_create", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_readoptions_destroy", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_restore_options_create", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_restore_options_destroy", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_writeoptions_create", referenced from:
      _main in ccNZ2cWh.o
  "_rocksdb_writeoptions_destroy", referenced from:
      _main in ccNZ2cWh.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

更新

将rocksdb库添加到Xcode中的Header和Library Search Path后如下：

我试过rocksdb website

rocksdb::DB* db;
rocksdb::Options options;

并遇到了另一个问题：

Answer 1

您必须告诉链接器rocksdb库的位置以及它的名称，以便它可以找到符号。

假设自制将rocksdb安装到/usr/local/Cellar/rocksdb/4.5.1，您可能需要以下内容：

gcc-5 -std=c++11 program.c -o program -L /usr/local/Cellar/rocksdb/4.5.1/lib -lrocksdb

或者，可能是版本特定的东西，因为无论如何它是符号链接的：

gcc-5 -std=c++11 program.c -o program -L /usr/local/lib -lrocksdb

如果您想使用Xcode GUI（而不是命令行），则需要跟踪this post中绿色，黄色，蓝色，红色的内容，但要填写{{{ 1}}如上所述。