Use OS.kernel_version

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• Have you followed the guidelines for contributing?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install <formula>)?

---

Requires next brew release after 2.4.12 (Depends on Homebrew/brew#8381)
Can be merged as of brew version 2.4.13

brew irb:

irb> "#{`uname -r`.to_i}"
=> "19"
irb> "#{OS.kernel_version.major}"
=> "19"
irb> "#{`uname -r`.chomp}"
=> "19.6.0"
irb> "#{OS.kernel_version}"
=> "19.6.0"
irb> Utils.safe_popen_read("uname", "-r").chomp
=> "19.6.0"

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irb(main):001:0> `uname -r`.split(".").first
=> "19"
irb(main):002:0> OS.kernel_version.major
=> #<Version::NumericToken 19>

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irb(main):001:0> `uname -r`.chomp
=> "19.6.0"
irb(main):002:0> OS.kernel_version
=> #<Version:0x00007fe0c0932828 @version="19.6.0">

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See gcc@4.9

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See gcc@4.9

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See gcc@4.9

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See ghc

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See ghc

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See ghc

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See ghc

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irb(main):007:0> Utils.safe_popen_read("uname", "-r").chomp
=> "19.6.0"
irb(main):008:0> OS.kernel_version
=> #<Version:0x00007fc5f5ad3488 @version="19.6.0", @tokens=[#<Version::NumericToken 19>, #<Version::NumericToken 6>, #<Version::NumericToken 0>]>

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10.15:

Error: 5 failed steps!
brew audit gcc@7 --online --git --skip-style
brew install --build-from-source bond
brew install --build-from-source bup
brew fetch --retry deno
brew test --retry --verbose agda

10.14, 10.13:

Error: 4 failed steps!
brew audit gcc@7 --online --git --skip-style
brew install --build-from-source bup
brew fetch --retry deno
brew test --retry --verbose agda

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• gcc@7 - revision bump not necessary
• bond - known failure (ghc: fix postinstall failure on linux #59336)
• bup - SHA256 mismatch unrelated to this PR
• deno - SHA256 mismatch unrelated to this PR
• agda - known failure (agda test fails #58984)