061f8cb35f
We override ENV[] to always return strings under superenv, because legacy formulae assume that CFLAGS, etc. are non-nil. However, the current implementation has a bug. If I simply concatenate ENV['CFLAGS'] with another string, it mutates ENV['CFLAGS']: irb> ENV['CFLAGS'] => "" irb> ENV['CFLAGS'] + 'a' => "a" irb> ENV['CFLAGS'] => "a" Instead, let's simply return an empty string if the key doesn't exist. This is sufficient because the following are equivalent: 1. ENV['CFLAGS'] += "string" 2. ENV['CFLAGS'] = ENV['CFLAGS'] + "string"
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