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POC: Retrieve the actual alignment of max_align_t #554

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POC: Retrieve the actual alignment of max_align_t #554

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Commits on Dec 4, 2022

  1. Retrieve the actual alignment of max_align_t 

    The code had a hard-coded maximum alignment of 16 (128 bits) which may
have potentially wasted memory and cause memory unsafety if it was ever
compiled with larger alignment (unlikely).

This change implements a trick to retrieve the actual alignment from C.
To achieve this a newly added C file defines a symbol initialized to
`_Alignof(max_align_t)`. It is then compiled (as a separate object), the
contents of the symbol is extracted and converted to decimal string
which is injected into the `AlignedType` definition. The definition is
generated as a separate `.rs` file in `OUT_DIR` and included into
`types.rs`.
    @Kixunil
    Kixunil committed Dec 4, 2022
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