Use $stdout instead of STDOUT [Bug #17600]

Author: marcandre

lib/benchmark.rb

@@ -163,8 +163,8 @@ module Benchmark
  #
 
  def benchmark(caption = "", label_width = nil, format = nil, *labels) # :yield: report
- sync = STDOUT.sync
- STDOUT.sync = true
+ sync = $stdout.sync
+ $stdout.sync = true
  label_width ||= 0
  label_width += 1
  format ||= FORMAT
@@ -176,7 +176,7 @@ def benchmark(caption = "", label_width = nil, format = nil, *labels) # :yield:
  }
  report.list
  ensure
- STDOUT.sync = sync unless sync.nil?
+ $stdout.sync = sync unless sync.nil?
  end
 
 
@@ -247,8 +247,8 @@ def bmbm(width = 0) # :yield: job
  job = Job.new(width)
  yield(job)
  width = job.width + 1
- sync = STDOUT.sync
- STDOUT.sync = true
+ sync = $stdout.sync
+ $stdout.sync = true
 
  # rehearsal
  puts 'Rehearsal '.ljust(width+CAPTION.length,'-')
@@ -268,7 +268,7 @@ def bmbm(width = 0) # :yield: job
  Benchmark.measure(label, &item).tap { |res| print res }
  }
  ensure
- STDOUT.sync = sync unless sync.nil?
+ $stdout.sync = sync unless sync.nil?
  end
 
  #