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				@ -469,7 +469,7 @@ module Homebrew
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        unless installed_gcc
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          run_as_not_developer { test "brew", "install", "gcc" }
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          installed_gcc = true
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          OS::Mac.clear_version_cache
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          DevelopmentTools.clear_version_cache
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          retry
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        end
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        skip formula_name
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@ -74,6 +74,21 @@ class DevelopmentTools
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          `#{path} --version`[/clang-(\d{2,})/, 1].to_i
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        end
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    end
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    def non_apple_gcc_version(cc)
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      (@non_apple_gcc_version ||= {}).fetch(cc) do
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        path = HOMEBREW_PREFIX.join("opt", "gcc", "bin", cc)
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        path = locate(cc) unless path.exist?
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        version = `#{path} --version`[/gcc(?:-\d(?:\.\d)? \(.+\))? (\d\.\d\.\d)/, 1] if path
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        @non_apple_gcc_version[cc] = version
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      end
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    end
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    def clear_version_cache
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      @gcc_40_build_version = @gcc_42_build_version = @llvm_build_version = nil
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      @clang_version = @clang_build_version = nil
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      @non_apple_gcc_version = {}
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    end
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  end
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end
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@ -109,21 +109,6 @@ module OS
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      s.path unless s.nil?
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    end
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    def non_apple_gcc_version(cc)
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      (@non_apple_gcc_version ||= {}).fetch(cc) do
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        path = HOMEBREW_PREFIX.join("opt", "gcc", "bin", cc)
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        path = DevelopmentTools.locate(cc) unless path.exist?
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        version = `#{path} --version`[/gcc(?:-\d(?:\.\d)? \(.+\))? (\d\.\d\.\d)/, 1] if path
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        @non_apple_gcc_version[cc] = version
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      end
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    end
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    def clear_version_cache
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      @gcc_40_build_version = @gcc_42_build_version = @llvm_build_version = nil
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      @clang_version = @clang_build_version = nil
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      @non_apple_gcc_version = {}
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    end
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    # See these issues for some history:
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    # https://github.com/Homebrew/legacy-homebrew/issues/13
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    # https://github.com/Homebrew/legacy-homebrew/issues/41
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