[rubygems/rubygems] Warn on empty or open required_ruby_version specification attribute.

https://github.com/rubygems/rubygems/commit/e4bb33747a

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/rubygems/specification_policy.rb b/lib/rubygems/specification_policy.rb
index 27c2681533..516c26f53c 100644
--- a/lib/rubygems/specification_policy.rb
+++ b/lib/rubygems/specification_policy.rb
@@ -103,6 +103,8 @@ class Gem::SpecificationPolicy
 
     validate_dependencies
 
+    validate_required_ruby_version
+
     validate_extensions
 
     validate_removed_attributes
@@ -227,6 +229,12 @@ duplicate dependency on #{dep}, (#{prev.requirement}) use:
     end
   end
 
+  def validate_required_ruby_version
+    if @specification.required_ruby_version.requirements == [Gem::Requirement::DefaultRequirement]
+      warning "make sure you specify the oldest ruby version constraint (like \">= 3.0\") that you want your gem to support by setting the `required_ruby_version` gemspec attribute"
+    end
+  end
+
   ##
   # Issues a warning for each file to be packaged which is world-readable.
   #