JRuby

Define a read-only global variable $-W

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Description

$-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:

$ ruby1.9 -e 'p $-W'
1

But if you give any of -v, -w or -W (without the argument), the value is 2:

$ 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

If you pass an argument to -W, that value is respected:

$ ruby1.9 -W0 -e 'p $-W'
0
$ ruby1.9 -W1 -e 'p $-W'
1
$ ruby1.9 -W2 -e 'p $-W'
2

I am not entirely sure how this variable is supposed to influence the warning output, however.

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Hiro Asari added a comment - - edited

This is fixed in bdd8acd.

$ jruby --1.9 -e 'p $-W'
1
$ jruby --1.9 -v -e 'p $-W'
jruby 1.7.0.dev (ruby-1.9.3-p0) (2011-11-30 bdd8acd) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_29) [darwin-x86_64-java]
2
$ jruby --1.9 -w -e 'p $-W'
2
$ jruby --1.9 -W -e 'p $-W'
2
$ jruby --1.9 -W0 -e 'p $-W'
0
$ jruby --1.9 -W1 -e 'p $-W'
1
$ jruby --1.9 -W2 -e 'p $-W'
2
$ jruby --1.9 -W2 -e 'p $-W = 1'
NameError: $-W is a read-only variable
  (root) at -e:1
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Hiro Asari added a comment - - edited This is fixed in bdd8acd. $ jruby --1.9 -e 'p $-W' 1 $ jruby --1.9 -v -e 'p $-W' jruby 1.7.0.dev (ruby-1.9.3-p0) (2011-11-30 bdd8acd) (Java HotSpot(TM) 64-Bit Server VM 1.6.0_29) [darwin-x86_64-java] 2 $ jruby --1.9 -w -e 'p $-W' 2 $ jruby --1.9 -W -e 'p $-W' 2 $ jruby --1.9 -W0 -e 'p $-W' 0 $ jruby --1.9 -W1 -e 'p $-W' 1 $ jruby --1.9 -W2 -e 'p $-W' 2 $ jruby --1.9 -W2 -e 'p $-W = 1' NameError: $-W is a read-only variable (root) at -e:1

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  • Assignee:
    Hiro Asari
    Reporter:
    Hiro Asari
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