ruby - Rails 中的事件机错误

Question

在更新我的 Rails 应用程序包时，它显示以下错误:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /home/mspd/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20150105-24447-rayukd.rb extconf.rb 
checking for rb_trap_immediate in ruby.h,rubysig.h... no
checking for rb_thread_blocking_region()... no
checking for inotify_init() in sys/inotify.h... yes
checking for writev() in sys/uio.h... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_enable_interrupt()... no
checking for rb_time_new()... yes
checking for sys/event.h... no
checking for epoll_create() in sys/epoll.h... yes
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling em.cpp
em.cpp: In member function ‘void EventMachine_t::_RunEpollOnce()’:
em.cpp:574:37: error: ‘rb_thread_select’ was not declared in this scope
   EmSelect (0, NULL, NULL, NULL, &tv);
                                     ^
em.cpp: In member function ‘int SelectData_t::_Select()’:
em.cpp:827:67: error: ‘rb_thread_select’ was not declared in this scope
  return EmSelect (maxsocket+1, &fdreads, &fdwrites, &fderrors, &tv);
                                                                   ^
em.cpp: In member function ‘void EventMachine_t::_RunSelectOnce()’:
em.cpp:946:40: error: ‘rb_thread_select’ was not declared in this scope
      EmSelect (0, NULL, NULL, NULL, &tv);
                                        ^
make: *** [em.o] Error 1

make failed, exit code 2

Gem files will remain installed in /home/mspd/.rvm/gems/ruby-2.2.0/gems/eventmachine-1.0.3 for inspection.
Results logged to /home/mspd/.rvm/gems/ruby-2.2.0/extensions/x86-linux/2.2.0/eventmachine-1.0.3/gem_make.out
An error occurred while installing eventmachine (1.0.3), and Bundler cannot continue.
Make sure that `gem install eventmachine -v '1.0.3'` succeeds before bundling.

当我尝试gem install eventmachine时，它仍然显示相同的错误。

我应该做什么？

Answer 1

我不是 EventMachine 维护者，但 EventMachine 可能永远不会支持 Ruby 2.2.0，因为他们只接受安全补丁，但不主动接受功能 PR。

他们也在公开场合提到了这一点README :

What platforms are supported by EventMachine?

EventMachine supports Ruby 1.8.7, 1.9.2, REE, JRuby and works well on Windows as well as many operating systems from the Unix family (Linux, Mac OS X, BSD flavors).

解决方案:回退到 Ruby 1.9.2 或使用 EventMachine 的替代方案.