How does Android build system know what HIDL version to use with a vendor blob?

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nexuspb

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Jul 9, 2014
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Let's say I'm building a custom ROM and I exact all the vendor blobs. From my understanding, these vendor blobs consist of the HAL system which will interact with the kernel device driver. From just the blob placed in the vendor folder, how does Android build system know which HIDL version this relates to?