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在 Amazon linux ami 上安装 eventmachine gem 时遇到问题，在 ruby​​-2.3.6 上工作正常，与 ruby​​-2.5.1 中断
步骤：
gem install eventmachine

注意：gcc version 7.2.1 20170915 (Red Hat 7.2.1-2) (GCC)
错误日志：

Building native extensions. This could take a while...
ERROR:  Error installing eventmachine:
ERROR: Failed to build gem native extension.
current directory: /home/ec2-user/.rvm/gems/ruby-2.5.1/gems/eventmachine-1.2.7/ext
/home/ec2-user/.rvm/rubies/ruby-2.5.1/bin/ruby -r ./siteconf20180724- 
3006-y7es83.rb extconf.rb
checking for -lcrypto... yes
checking for -lssl... yes
checking for openssl/ssl.h... yes

checking for CLOCK_MONOTONIC in time.h... yes
CXXFLAGS=$(cxxflags)

creating Makefile
current directory: /home/ec2-user/.rvm/gems/ruby 2.5.1/gems/eventmachine-1.2.7/ext
make "DESTDIR=" clean
current directory: /home/ec2-user/.rvm/gems/ruby- 
2.5.1/gems/eventmachine-1.2.7/ext
make "DESTDIR="

compiling binder.cpp
g++: error: unrecognized command line option ‘-Wmisleading-indentation’
g++: error: unrecognized command line option ‘-Wimplicit-fallthrough=0’
g++: error: unrecognized command line option ‘-Wduplicated-cond’
g++: error: unrecognized command line option ‘-Wrestrict’

make: *** [binder.o] Error 1

make failed, exit code 2

Gem files will remain installed in /home/ec2-user/.rvm/gems/ruby-2.5.1/gems/eventmachine-1.2.7 for inspection.
Results logged to /home/ec2-user/.rvm/gems/ruby-2.5.1/extensions/x86_64-linux/2.5.0/eventmachine-1.2.7/gem_make.out
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1 回答 1

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在 AWS 内核更新之后，出现这种情况的根本原因似乎是 AWS 上的 gcc 和 g++ 版本不匹配。解决方案是运行：

sudo yum remove gcc48-c++
sudo yum install gcc72-c++

见https://github.com/cowboyd/therubyracer/issues/446

于 2018-08-14T16:18:42.757 回答