安装mysql2 gem时出错：无法构建gem本机扩展 [英] Error installing mysql2 gem: Failed to build gem native extension

问题描述

Windows XP。 Ruby 1.9.2。安装Rails。 MySQL已安装。当我尝试运行 gem install mysql2 （或者 bundle install ）时，出现错误：

  C：\ruby\cred2> gem install mysql2 
构建原生扩展。这可能需要一段时间... 
错误：安装mysql2时出错：
错误：无法构建gem本机扩展。 
 
 C：/Ruby192/bin/ruby.exe extconf.rb 
检查rb_thread_blocking_region（）... *** extconf.rb失败*** 
无法创建Makefile由于某种原因，可能缺少
必需的库和/或头文件。查看mkmf.log文件以获取更多
的详细信息。您可能需要配置选项。 
 
提供的配置选项：
 --with-opt-dir 
 --without-opt-dir 
 --with-opt-include 
  - -without-opt-include = $ {opt-dir} / include 
 --with-opt-lib 
 --without-opt-lib = $ {opt-dir} / lib 
 --with-make-prog 
 --without-make-prog 
 --srcdir =。 
 --curdir 
 --ruby = C：/ Ruby192 / bin / ruby​​ 
 C：/Ruby192/lib/ruby/1.9.1/mkmf.rb：368：in`try_do' ：编译器未能生成可执行文件
 te。 （RuntimeError）
您必须先安装开发工具。 C：/Ruby192/lib/ruby/1.9.1/mkmf.rb中的
：435：在C：/Ruby192/lib/ruby/1.9.1/mkmf.rb的`try_link0'
中： 440：在C：/Ruby192/lib/ruby/1.9.1/mkmf.rb：552的`try_link'
中：在C：/Ruby192/lib/ruby/1.9的`try_func'
中。 1 / mkmf.rb：797：在`block in have_func'
 from C：/Ruby192/lib/ruby/1.9.1/mkmf.rb：693：在`block in checking_for'
 from C ：/Ruby192/lib/ruby/1.9.1/mkmf.rb：280：在postp 
中的块（2级）中，从C：/Ruby192/lib/ruby/1.9.1开始一个
 /mkmf.rb:254:in`open'
 from C：/Ruby192/lib/ruby/1.9.1/mkmf.rb：280：在`block in block'
 from C：/ Ruby192 /lib/ruby/1.9.1/mkmf.rb:254:in`open'
 from C：/Ruby192/lib/ruby/1.9.1/mkmf.rb：276：in`postpone'
从C：/Ruby192/lib/ruby/1.9.1/mkmf.rb：692：在'checking_for'
从C：/Ruby192/lib/ruby/1.9.1/mkmf.rb：796：in `have_func'
 from extconf.rb：9：`< main>'
 
 
 Gem文件wi将继续安装在C：/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0中。 
 2.4进行检查。 
记录到C的结果：/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.2.4/ext/mysql2/ge 
 m_make.out 
 
 C：\ruby\cred2> 
  

解决方案

只为记录：问题应该解决！

mysql2 gem v.0.2.6已发布，支持win32。

gem install mysql2 现在没有问题（已安装DevKit）。

请参阅： http://github.com/brianmario/mysql2/issues/issue/8#issue/8/comment/479748

Windows XP. Ruby 1.9.2. Rails installed. MySQL installed. When I try to run gem install mysql2 (or bundle install) I get errors:

C:\ruby\cred2>gem install mysql2
Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.

C:/Ruby192/bin/ruby.exe extconf.rb
checking for rb_thread_blocking_region()... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=C:/Ruby192/bin/ruby
C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to genera
te an executable file. (RuntimeError)
You have to install development tools first.
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:435:in `try_link0'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:440:in `try_link'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:552:in `try_func'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:797:in `block in have_func'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postp
one'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:254:in `open'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:254:in `open'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
        from C:/Ruby192/lib/ruby/1.9.1/mkmf.rb:796:in `have_func'
        from extconf.rb:9:in `<main>'


Gem files will remain installed in C:/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.
2.4 for inspection.
Results logged to C:/Ruby192/lib/ruby/gems/1.9.1/gems/mysql2-0.2.4/ext/mysql2/ge
m_make.out

C:\ruby\cred2>

解决方案

Just for the record: The problem should be solved!

The mysql2 gem v.0.2.6 is out, having win32 support.

gem install mysql2 worked without problems now (DevKit installed).

See: http://github.com/brianmario/mysql2/issues/issue/8#issue/8/comment/479748

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