如何在Heroku上使用rdiscount？

Question

我正在尝试将一个小测试应用程序推送到Heroku.这是App和Gem文件:

应用程序:

require 'sinatra'
require 'haml'
require 'rdiscount'

set :markdown, :layout_engine => :haml, :layout => :layout


get '/' do 
  haml :index
end

get '/blog' do 
  markdown :test
end

的Gemfile:

source :rubygems
gem 'sinatra'
gem 'thin'
gem 'haml'
gem 'rdiscount'

在推进Heroku之前我跑了bundle install.但是在尝试安装rdiscount gem时,推送到Heroku会失败:

-----> Ruby/Rack app detected
-----> Installing dependencies using Bundler version 1.3.0.pre.5
   Running: bundle install --without development:test --path vendor/bundle --binstubs   vendor/bundle/bin --deployment
   Fetching gem metadata from http://rubygems.org/..........
   Fetching gem metadata from http://rubygems.org/..
   Using daemons (1.1.9)
   Using eventmachine (1.0.0)
   Using haml (3.1.7)
   Using rack (1.4.3)
   Using rack-protection (1.3.2)
   installing rdiscount (2.0.7)
   Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
   /usr/local/bin/ruby extconf.rb
   checking for random()... yes
   checking for srandom()... yes
   checking for rand()... yes
   checking for srand()... yes
   checking size of unsigned long... long
   checking size of unsigned int... int
   no int with size 4
   *** 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=/usr/local/bin/ruby
   --with-rdiscount-dir
   --without-rdiscount-dir
   --with-rdiscount-include
   --without-rdiscount-include=${rdiscount-dir}/include
   --with-rdiscount-lib
   --without-rdiscount-lib=${rdiscount-dir}/lib
   Gem files will remain installed in /tmp/build_3aijv3ga0dy1y/vendor/bundle/ruby/1.9.1/gems/rdiscount-2.0.7 for inspection.
   Results logged to /tmp/build_3aijv3ga0dy1y/vendor/bundle/ruby/1.9.1/gems/rdiscount-2.0.7/ext/gem_make.out
   An error occurred while installing rdiscount (2.0.7), and Bundler cannot continue.
   Make sure that `gem install rdiscount -v '2.0.7'` succeeds before bundling.
 !
 !     Failed to install gems via Bundler.
 !
 !     Heroku push rejected, failed to compile Ruby/rack app

我确实理解rdiscount可能依赖于其他一些Gems或库,并且这种依赖性似乎没有得到解决.但是,我不明白如何解决这个问题.你能就如何让它发挥作用给我一些建议吗？

Answer 1

在Heroku上似乎存在Ruby 1.9.2的问题以及它认为int的字节数是多少.

尝试ruby "1.9.3"像这样添加Gemfile:

source :rubygems
ruby "1.9.3"

gem 'sinatra'
gem 'thin'
gem 'haml'
gem 'rdiscount'

我自己的测试在1.9.2上重现了你的错误并在1.9.3上成功了