安装mysql2（0.3.21）时发生错误，并且Bundler无法继续

Question

我尝试捆绑应用程序时出现此错误的任何原因：我尝试按照他们的建议安装gem install mysql2 -v'0.3.21'，但无法正确安装。我也在macOS High Sierra上运行它。对不起，我对此问题措辞不好，因为这是我第一次与红宝石合作。

 To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /Users/yamanshrestha/Desktop/Dorsata/vendor/bundle/ruby/2.3.0/extensions/universal-darwin-17/2.3.0/mysql2-0.3.21/mkmf.log

current directory: /Users/yamanshrestha/Desktop/Dorsata/vendor/bundle/ruby/2.3.0/gems/mysql2-0.3.21/ext/mysql2
make "DESTDIR=" clean

current directory: /Users/yamanshrestha/Desktop/Dorsata/vendor/bundle/ruby/2.3.0/gems/mysql2-0.3.21/ext/mysql2
make "DESTDIR="
compiling infile.c
compiling client.c
client.c:439:3: error: use of undeclared identifier 'my_bool'
  my_bool res = mysql_read_query_result(client);
  ^
client.c:441:19: error: use of undeclared identifier 'res'
  return (void *)(res == 0 ? Qtrue : Qfalse);
                  ^
client.c:762:3: error: use of undeclared identifier 'my_bool'
  my_bool boolval;
  ^
client.c:793:7: error: use of undeclared identifier 'boolval'
      boolval = (value == Qfalse ? 0 : 1);
      ^
client.c:794:17: error: use of undeclared identifier 'boolval'
      retval = &boolval;
                ^
client.c:797:10: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'; did you mean 'MYSQL_DEFAULT_AUTH'?
    case MYSQL_SECURE_AUTH:
         ^~~~~~~~~~~~~~~~~
         MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.11/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
  MYSQL_DEFAULT_AUTH,
  ^
client.c:798:7: error: use of undeclared identifier 'boolval'
      boolval = (value == Qfalse ? 0 : 1);
      ^
client.c:799:17: error: use of undeclared identifier 'boolval'
      retval = &boolval;
                ^
client.c:830:38: error: use of undeclared identifier 'boolval'
        wrapper->reconnect_enabled = boolval;
                                     ^
client.c:1185:38: error: use of undeclared identifier 'MYSQL_SECURE_AUTH'; did you mean 'MYSQL_DEFAULT_AUTH'?
  return _mysql_client_options(self, MYSQL_SECURE_AUTH, value);
                                     ^~~~~~~~~~~~~~~~~
                                     MYSQL_DEFAULT_AUTH
/usr/local/Cellar/mysql/8.0.11/include/mysql/mysql.h:188:3: note: 'MYSQL_DEFAULT_AUTH' declared here
  MYSQL_DEFAULT_AUTH,
  ^
10 errors generated.
make: *** [client.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/yamanshrestha/Desktop/Dorsata/vendor/bundle/ruby/2.3.0/gems/mysql2-0.3.21 for inspection.
Results logged to /Users/yamanshrestha/Desktop/Dorsata/vendor/bundle/ruby/2.3.0/extensions/universal-darwin-17/2.3.0/mysql2-0.3.21/gem_make.out

An error occurred while installing mysql2 (0.3.21), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.21' --source 'http://rubygems.org/'` succeeds before bundling.

Answer 1

通过降级我的 mysql 来修复。并使用mysql v5.7编译mysql2。

对于 Mac 用户：

brew install mysql@5.7

gem install mysql2 -v '0.3.21' -- --with-mysql-include=/usr/local/Cellar/mysql@5.7/5.7.25/include/mysql --with-mysql-lib=/usr/local/Cellar/mysql@5.7/5.7.25/lib

参考：https : //github.com/brianmario/mysql2#configuration-options

Answer 2

因此，环顾四周后，我设法自己解决了这个问题。基本上，与编写的代码相比，在gemfile中写入的mysql2版本已经过时，因此，在尝试安装mysql2时，版本之间的语法差异导致此错误。因此，要解决此问题，您必须转到您的gemfile，然后更改mysql2的版本号。我将地雷更改为以下内容：

 gem 'mysql2', '~> 0.4.10'

保存文件并尝试再次安装，它应该会工作

Answer 3

对于 ubuntu，这个帮助了我：

sudo apt-get -f install
sudo apt-get update
sudo apt-get install libmysqlclient-dev
bundle install

我在这里找到了这个https://github.com/brianmario/mysql2/issues/445