Define a read-only global variable $-W
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Key: JRUBY-6241
URL: https://jira.codehaus.org/browse/JRUBY-6241
Project: JRuby
Issue Type: Improvement
Components: Core Classes/Modules
Reporter: Hiro Asari
{{$-W}} corresponds to the warning level set forth by the {{-W}} flag.
The behavior of this variable is rather strange. If {{-W}} is not given, the
value is 1:
{noformat}
$ ruby1.9 -e 'p $-W'
1
{noformat}
But if you give any of {{-v}}, {{-w}} or {{-W}} (without the argument), the
value is 2:
{noformat}
$ ruby1.9 -v -e 'p $-W'
ruby 2.0.0dev (2011-11-21 trunk 33804) [x86_64-darwin11.2.0]
2
$ ruby1.9 -W -e 'p $-W'
2
$ ruby1.9 -w -e 'p $-W'
2
{noformat}
If you pass an argument to {{-W}}, that value is respected:
{noformat}
$ ruby1.9 -W0 -e 'p $-W'
0
$ ruby1.9 -W1 -e 'p $-W'
1
$ ruby1.9 -W2 -e 'p $-W'
2
{noformat}
I am not entirely sure how this variable is supposed to influence the warning
output, however.
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