[ruby-core:105683] [Ruby master Feature#17468] Deprecate RUBY_DEVEL

["jeremyevans0 (Jeremy Evans)" <noreply@ruby-lang.org>]

Issue #17468 has been updated by jeremyevans0 (Jeremy Evans).


I looked into this.  If we removed `RUBY_DEVEL`, we would make it so `ruby_debug_log` was never defined, since it is only defined if `RUBY_DEVEL` is defined.  Basically, removing `RUBY_DEVEL` is equivalent to removing the removing the entire debug logging feature.

I think a safer and less invasive change is to make `RUBY_DEVEL` not depend on `PATCH_LEVEL`.  By doing so, Ruby developers that want to use debug logging can still manually use `RUBY_DEVEL=yes` when configuring, but it will never be enabled automatically. I submitted a pull request for this: https://github.com/ruby/ruby/pull/4993.  One change it makes is to set `USE_RUBY_DEBUG_LOG` to 1 instead of 0 if `RUBY_DEVEL` is defined and `USE_RUBY_DEBUG_LOG` isn't.  Since `RUBY_DEVEL` is no longer enabled automatically, the main reason to enable it would be to support debug logging, in which case I think `1` is a better default.

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Feature #17468: Deprecate RUBY_DEVEL
https://bugs.ruby-lang.org/issues/17468#change-94183

* Author: naruse (Yui NARUSE)
* Status: Open
* Priority: Normal
* Target version: 3.1
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Some configuration of Ruby use RUBY_DEVEL, which depends PATCH_LEVEL.
But depending PATCH_LEVEL causes issues which will become revealed on the final release.
Though we release some previews and RCs, they don't contributes the quality around RUBY_DEVEL.

Therefore to ensure CI tests the quality of the final release, we need to deprecate RUBY_DEVEL.



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