[ruby-core:108143] [Ruby master Feature#16978] Ruby should not use realpath for __FILE__

Issue #16978 has been updated by retro (Josef Šimánek).


We have hit this problem as well in rubygems and it is really unexpected and confusing.

https://github.com/rubygems/rubygems/pull/5437

TL;DR; test passes calling `rake test`, but not using `ruby -I... test/file.rb`

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Feature #16978: Ruby should not use realpath for __FILE__
https://bugs.ruby-lang.org/issues/16978#change-97119

* Author: vo.x (Vit Ondruch)
* Status: Open
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
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This is the simplest test case:

~~~
$ mkdir a

$ echo "puts __FILE__" > a/test.rb

$ ln -s a b

$ ruby -Ib -e "require 'test'"
/builddir/a/test.rb
~~~

This behavior is problematic, because Ruby should not know nothing about the `a` directory. It was not instructed to use it. I should always refer to the file using the original path and do not dig into the underlying details, otherwise depending on file system setup, one might be forced to used `File.realpath` everywhere trying to use `__FILE__`.



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