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Gem::Specification#initialize skips the local platform when it takes the platform from Gem.platforms, so the option produced a ruby platform gem. A platform set in the gemspec still wins. #9344 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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gem build --platform aarch64-linuxon aarch64 Linux buildsfoo-1.0.geminstead offoo-1.0-aarch64-linux.gem. Passing any other platform works.Gem::Specification#initializenever infers the local platform fromGem.platforms, so the option has no effect when it names the local platform.With this change
gem buildapplies the local platform when--platformnames it and the gemspec leaves the platform unset. A platform set in the gemspec still wins, sos.platform = "java"builds a java gem whatever--platformsays. Behavior for non-local platforms is unchanged.Fixes #9344
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