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sys: Disable -Walloc-size-larger-than for GCC 9+
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Authored by jhb on Nov 13 2023, 10:30 PM.
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Details

Summary

By default this warns about sizes larger than PTRDIFF_MAX passed to
malloc (rather than SIZE_MAX). This doesn't trigger
deterministically, but it does trigger for kmalloc() of struct_size()
in iwlwifi's iwl_configure_rxq even when struct_size() is changed to
use PTRDIFF_MAX. NB: struct_size() in Linux caps the size at
SIZE_MAX, not PTRDIFF_MAX via size_mul().

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rG FreeBSD src repository
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Build 51301: arc lint + arc unit