Pin rbs to >= 4.1.0.pre.2 to fix JRuby CI#442
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rdoc 8 added a dependency on rbs, which has no java platform gem before 4.1.0.pre.2, so bundle install fails building rbs's C extension on JRuby. Pin rbs to >= 4.1.0.pre.2 on JRuby only. See ruby/rdoc#1746
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This was referenced Jul 6, 2026
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Problem
The
jrubyCI job fails atbundle install:rdoc 8added a dependency onrbs(pulled in transitively:rubygems-tasks→irb→rdoc). Before4.1.0.pre.2,rbsshipped only a C-extension gem, sobundle installtries to compile a native extension — which fails on the JRuby CI runner because it has no C compiler toolchain.Upstream: ruby/rdoc#1746
Fix
Pin
rbsto>= 4.1.0.pre.2on JRuby only — that release publishes ajavaplatform variant with no native extension to build. Other Rubies are unaffected and keep resolving whateverrdoc/rbsthey normally would.