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Re:The AWS SDK for Go is now 1.0 by rifung on Thursday November 19, 2015 @09:34PM (#10599244)
Unless things have changed drastically, they use internal tools to generate the code. I used to work on one of the SDK teams.
Re:The AWS SDK for Go is now 1.0 by TheDong on Friday November 20, 2015 @03:23AM (#10600240)
They have a makefile target called generate

https://github.com/aws/aws-sdk-go/blob/v1.0.0/Makefile#L31

Reading the code, it looks like the most important lines are around here: https://github.com/aws/aws-sdk-go/blob/v1.0.0/private/model/...