[ruby-core:105647] [Ruby master Feature#17760] Where we should install a header file when `gem install --user`?

["byroot (Jean Boussier)" <noreply@ruby-lang.org>]

Issue #17760 has been updated by byroot (Jean Boussier).


> then it should bump the major version (or some other well-documented scheme).

I can hardly see something like this working in practice. Maybe for digest it would work as realistically it won't change much in the future. But if Rubygems introduce this header file management, other gems will start using it, and I can foresee tons of problems.



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Feature #17760: Where we should install a header file when `gem install --user`?
https://bugs.ruby-lang.org/issues/17760#change-94137

* Author: mrkn (Kenta Murata)
* Status: Third Party's Issue
* Priority: Normal
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As `digest` have been made a default gem at Ruby 3.0,  it can be installed by `gem install` command.

When we install `digest`, `digest.h` is installed at the same directory as `ruby.h`.  But when we use `gem install --user` for installing it, where should `digest.h` is installed in?

Now, the location of `digest.h` is always the same directory as `ruby.h` regardless of whether we use `gem install --user`.  It occurs permission error when non-root user uses `gem install --user` for installing `digest` on the system-ruby.



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