Bug #2792: String#to_f on Ruby-1.8.6-p399

• Status: Third Party's Issue
• Assignee: -
• ruby -v: ruby 1.8.6 (2010-02-05 patchlevel 399) [x86_64-linux]

[mutomasa (Masao Mutoh)]

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Ruby-1.8.6のString#to_fで、小数点の扱いがおかしいようです。

% ruby -v -e 'p "0.7".to_f'
ruby 1.8.6 (2010-02-05 patchlevel 399) [x86_64-linux]
7.0

% ruby -v -e 'p "0.7".to_f'
ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]
0.7
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[runpaint (Run Paint Run Run)]

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I suspect I'm seeing a symptom of the same problem. Just installed "ruby 1.8.6 (2010-03-05 patchlevel 400) [i686-linux]" from source, and found floats to be horribly broken.

1.3.to_int
=> 13
irb(main):002:0> 1.3.ceil
=> 13
irb(main):003:0> 2 + 0.5
=> 7.0

Am I missing a dependency or is this a regression?
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[mame (Yusuke Endoh)]

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遠藤です。

Ruby-1.8.6のString#to_fで、小数点の扱いがおかしいようです。

% ruby -v -e 'p "0.7".to_f'
ruby 1.8.6 (2010-02-05 patchlevel 399) [x86_64-linux]
7.0

gcc 4.4.1 を使っていませんか？
[ruby-core:26937] [ruby-core:28037] で同様の報告があり、
gcc 4.4.1 のバグのせいではないかということです。

gcc 4.3 か gcc 4.4.2 なら大丈夫だそうです。

--
Yusuke ENDOH [e-mail]

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[runpaint (Run Paint Run Run)]

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Bah. I'd missed that thread. Thanks, Yusuke.
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[marcandre (Marc-Andre Lafortune)]

• Status changed from Open to Third Party's Issue

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