From: Oleg Dashevskii <redmine@...>
Date: 2009-07-06T15:36:43+09:00
Subject: [ruby-core:24161] [Bug #1735] Ruby compiled with gcc 4.4.0: problems in date.rb

Bug #1735: Ruby compiled with gcc 4.4.0: problems in date.rb
http://redmine.ruby-lang.org/issues/show/1735

Author: Oleg Dashevskii
Status: Open, Priority: Normal
ruby -v: ruby 1.8.6 (2009-06-08 patchlevel 369) [x86_64-linux] 

I have a 64-bit ArchLinux system with gcc 4.4.0 and glibc 2.10.1. The distro itself ships 1.8.7, but I use REE which is 1.8.6-based. I'll illustrate the problem with stock Ruby 1.8.6-p369.

===========================================
home:~% /opt/ruby-1.8.6-p369/bin/irb 
irb(main):001:0> t = Time.now
=> Mon Jul 06 13:21:20 +0700 2009
irb(main):002:0> [t.year, t.month, t.day] 
=> [2009, 7, 6]
irb(main):003:0> d = Date.civil_to_jd(t.year, t.month, t.day) 
=> 248077102
irb(main):004:0> Date.jd_to_civil(d) 
=> [2075, -1, 37364]
irb(main):005:0> 
===========================================

I've run into this in my Rails app, namely with activesupport: 1.day.from_now and 1.year.from_now. The former raises ArgumentError with "invalid date", the latter just hangs.

The original post is on the REE group: http://groups.google.com/group/emm-ruby/browse_thread/thread/5bdb6869ed0f9843
Other people with gcc 4.4.0 have confirmed this bug.

Here's valid behavior in 1.8.7:

===========================================
>> RUBY_VERSION
=> "1.8.7"
>> RUBY_PATCHLEVEL 
=> 173
>> t = Time.now
=> Mon Jul 06 13:34:12 0700 2009
>> [t.year, t.month, t.day] 
=> [2009, 7, 6]
>> d = Date.civil_to_jd(t.year, t.month, t.day) 
=> 2455019
>> Date.jd_to_civil(d) 
=> [2009, 7, 6]
===========================================


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