我尝试绑定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。我还在macos high sierra上运行这个。很抱歉我对这个问题的措辞不好，因为这是我第一次和ruby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.
5条答案
按热度按时间hwazgwia1#
修复降级我的mysql。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参考文献：https://github.com/brianmario/mysql2#configuration-选项nom7f22z2#
我也有同样的问题。正如您在错误中看到的，存在代码解释问题。这是由在gemfile中编写的mysql2版本和在代码中使用的mysql2版本不匹配造成的。为了解决这个问题，我运行：
-gem安装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'
7rfyedvj3#
所以，我环顾了一下，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的版本已经过时，因此在尝试安装mysql2时，版本之间的语法差异导致了这个错误。因此，要解决这个问题，您必须转到您的gemfile，然后更改mysql2的版本号。我将地雷改为：
保存文件并再次尝试安装，它应该可以正常工作
wmvff8tz4#
对我来说，这本书帮助了我：
我在这里找到了这个https://github.com/brianmario/mysql2/issues/445
t3irkdon5#
对我来说，解决方案是安装mysql-connector-c，
brew install mysql-connector-c. 在我的特殊情况下，它已经安装了，但我不得不用force overwrite重新链接它（控制台中的消息将确切地告诉您在您的情况下该怎么做）。