Question

尝试捆绑应用程序时出现此错误的任何原因：我已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。很抱歉我这个问题的措辞不好，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

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中编写的mysql2版本已过时，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，然后尝试重新安装，应该会出现问题

Answer 2

通过降级我的mysql来解决。然后使用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 3

对于ubuntu来说，这帮助了我

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

我在这里https://github.com/brianmario/mysql2/issues/445

找到了这个

Answer 4

我有同样的问题。正如您在错误中看到的那样，存在代码解释问题。这是由用gemfile编写并在代码中使用的mysql2版本之间不匹配引起的。 要解决，我运行：
-gem install mysql2（它将安装最新的msql2版本）
-在我的gemfile中，我将 gem'mysql2'，'〜> 0.3.1'更改为 gem'mysql2'

Answer 5

对我来说，解决方案是安装mysql-connector-c brew install mysql-connector-c。在我的特定情况下，它已经安装了，但是我不得不通过强制覆盖将其重新链接（控制台中的消息会告诉您确切的情况）。

安装mysql2（0.3.21）时发生错误，并且Bundler无法继续

5 个答案: