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comp.lang.ruby

Warning when running sqlite3 with Ruby on Windows

Eli Bendersky

1/30/2008 7:59:00 PM

Hello,

I installed ruby-sqlite3 as a gem from Rubyforge to my Windows PC.
I've also downloaded the sqlite3 DLL and placed it in the same
directory with my script, for testing. This simple code:

require 'sqlite3'

db = SQLite3::Database.new( "test.db" )

Creates the following warning:
c:/ruby/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.1-mswin32/lib/
sqlite3_api.so: warning: global variable `
$swig_runtime_data_type_pointer2' not initialized


However, SQLite3 seems to be working correctly. The DB file is
created, queries work, etc.

Any ideas on how to get rid of that pesky warning ?

Thanks in advance,
Eli

P.S. Ruby 1.8.6 from the one click installer for Windows
3 Answers

Luis Lavena

1/30/2008 11:22:00 PM

0

On Jan 30, 5:59 pm, Eli Bendersky <eli...@gmail.com> wrote:
> Hello,
>
> I installed ruby-sqlite3 as a gem from Rubyforge to my Windows PC.
> I've also downloaded the sqlite3 DLL and placed it in the same
> directory with my script, for testing. This simple code:
>
> require 'sqlite3'
>
> db = SQLite3::Database.new( "test.db" )
>
> Creates the following warning:
> c:/ruby/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.1-mswin32/lib/
> sqlite3_api.so: warning: global variable `
> $swig_runtime_data_type_pointer2' not initialized
>
> However, SQLite3 seems to be working correctly. The DB file is
> created, queries work, etc.
>
> Any ideas on how to get rid of that pesky warning ?
>
> Thanks in advance,
> Eli
>
> P.S. Ruby 1.8.6 from the one click installer for Windows

Can you be more specific?

the gem is sqlite3-ruby:
sqlite3-ruby (1.2.1)

The latest One-Click Installer version:
ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]

RubyGems version installed:
0.9.4

(Also tested on 1.0.1)

Output from IRB:

irb(main):001:0> require 'rubygems'
=> true
irb(main):002:0> require 'sqlite3'
=> true
irb(main):003:0> db = SQLite3::Database.new("test.db3")
=> #<SQLite3::Database:0x516f198 ...>

Now, using ruby command line:

D:\Users\Luis\Desktop>ruby test-sqlite3.rb

No output for your script

and with -v (Verbose mode):
D:\Users\Luis\Desktop>ruby -v test-sqlite3.rb
ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
C:/Ruby/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.1-x86-mswin32/lib/
sqlite3_api.so: warning: global variable `
$swig_runtime_data_type_pointer2' not initialized

Conclusion:
The warning you're getting is because:
You used -v command line option to run your script or
You tweaked $VERBOSE and set it to true

HTH,
--
Luis Lavena

Eli Bendersky

1/31/2008 1:56:00 PM

0

> and with -v (Verbose mode):
> D:\Users\Luis\Desktop>ruby -v test-sqlite3.rb
> ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
> C:/Ruby/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.1-x86-mswin32/lib/
> sqlite3_api.so: warning: global variable `
> $swig_runtime_data_type_pointer2' not initialized
>
> Conclusion:
> The warning you're getting is because:
> You used -v command line option to run your script or
> You tweaked $VERBOSE and set it to true
>

Luis,

Thank you - this actually explains the problem. However, I am not
running with -v, but rather with -w.

This script:

require 'sqlite3'
puts $VERBOSE
db = SQLite3::Database.new( "test.db" )

When run simply as "ruby test.rb" prints "false". When run as "ruby -w
test.rb" prints "true" and the aforementioned warning.

So, the next question is - doesn't everyone run ruby with -w ? If the
answer is positive, can I get rid of that warning anyway?

Thanks in advance,
Eli

Luis Lavena

1/31/2008 10:31:00 PM

0

On Jan 31, 11:56 am, Eli Bendersky <eli...@gmail.com> wrote:
> > and with -v (Verbose mode):
> > D:\Users\Luis\Desktop>ruby -v test-sqlite3.rb
> > ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
> > C:/Ruby/lib/ruby/gems/1.8/gems/sqlite3-ruby-1.2.1-x86-mswin32/lib/
> > sqlite3_api.so: warning: global variable `
> > $swig_runtime_data_type_pointer2' not initialized
>
> > Conclusion:
> > The warning you're getting is because:
> > You used -v command line option to run your script or
> > You tweaked $VERBOSE and set it to true
>
> Luis,
>
> Thank you - this actually explains the problem. However, I am not
> running with -v, but rather with -w.
>
> This script:
>
> require 'sqlite3'
> puts $VERBOSE
> db = SQLite3::Database.new( "test.db" )
>
> When run simply as "ruby test.rb" prints "false". When run as "ruby -w
> test.rb" prints "true" and the aforementioned warning.
>
> So, the next question is - doesn't everyone run ruby with -w ? If the
> answer is positive, can I get rid of that warning anyway?

Enabling warnings is a good practice doing testing. In that way you
avoid introduce code that could break (due deprecations between
versions of the language) or because changes introduced can lead to
bugs hard to track.

In this case it seems the SWIG'ed SQLite3 code check or try to access
a undefined global variable.

You can google about that variable name and also dig into the sqlite3-
ruby C extension code to find the root of the problem and provide a
patch.

I haven't seen a good use of -w or -v outside the context I described.

Hope this shed some light :-)

Regards,
--
Luis Lavena