From: Aydın Mercan <aydin@isc.org>
Date: Tue, 19 Aug 2025 11:03:12 +0000 (+0300)
Subject: new: dev: add <isc/bit.h>
X-Git-Tag: v9.21.12~36
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=87dfd96743c85ded2533b2306dbf48740f19785e;p=thirdparty%2Fbind9.git

new: dev: add <isc/bit.h>

The `<isc/bit.h>` header is a GNU C11 compatible version of C23's
`<stdbit.h>`.

It currently uses either `<stdbit.h>` or the equivilent compiler
builtins. However, the generic `__builtin_ctzg` and `__builtin_ctlz`
builtins are not available in every compiler version and thus falls
back to manually selecting from type.

Furthermore, the ctz fallback has been removed since `__builtin_ctzll`
has been used for a while directly without any compilation issues from
users. Thus, we can also require `__builtin_ctz`.

Merge branch 'aydin/isc_bit' into 'main'

See merge request isc-projects/bind9!10282
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87dfd96743c85ded2533b2306dbf48740f19785e