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Resolve "remove dead stores"

Closes #1017

See merge request !1926

teach clang analyser that _assert_int_equal and _assert_int_not_equal don't return on failure

See merge request !1807

Make <isc/endian.h> more portable

Closes #1049, #1048, and #856

See merge request !2001

On DragonFly BSD, use the same commands for configuring network
interfaces used during system tests as on NetBSD and OpenBSD.

Add a comment and remove redundant definitions.

Move the macOS section of <isc/endian.h> to a lower spot as it is
believed not to be the most popular platform for running BIND.  Add a
comment and remove redundant definitions.

Instead of only supporting Linux, try making <isc/endian.h> support
other GNU platforms as well.  Since some compilers define __GNUC__ on
BSDs (e.g. Clang on FreeBSD), move the relevant section to the bottom of
the platform-specific part of <isc/endian.h>, so that it only gets
evaluated when more specific platform determination criteria are not
met.  Also include <byteswap.h> so that any byte-swapping macros which
may be defined in that file on older platforms are used in the fallback
definitions of the nonstandard hto[bl]e{16,32,64}() and
[bl]e{16,32,64}toh() conversion functions.

While Solaris does not support the nonstandard hto[bl]e{16,32,64}() and
[bl]e{16,32,64}toh() conversion functions, it does have some
byte-swapping macros available in <sys/byteorder.h>.  Ensure these
macros are used in the fallback definitions of the aforementioned
nonstandard functions.

Since the hto[bl]e{16,32,64}() and [bl]e{16,32,64}toh() conversion
functions are nonstandard, add fallback definitions of these functions
to <isc/endian.h>, so that their unavailability does not prevent
compilation from succeeding.

Current versions of DragonFly BSD, FreeBSD, NetBSD, and OpenBSD all
support the modern variants of functions converting values between host
and big-endian/little-endian byte order while older ones might not.
Ensure <isc/endian.h> works properly in both cases.

Merge branch 'michal/smartsign-system-test-properly-detect-presence-of-cds-cdnskey-records' into 'master'

"smartsign" system test: properly detect presence of CDS/CDNSKEY records

See merge request !1988

Replace grep calls with awk scripts to more precisely detect presence of
CDS and CDNSKEY records in a signed zone file, in order to prevent rare
false positives for the "smartsign" system test triggered by the strings
"CDS" and/or "CDNSKEY" being accidentally present in the Base64 form of
DNSSEC-related data in the zone file being checked.

Merge branch '1009-isc-support-13911-ixfr-requests-sometimes-have-ending-logged-but-not-start' into 'master'

Resolve "[ISC-support #13911] IXFR requests sometimes have ending logged but not start"

Closes #1009

See merge request !1887

placeholder

See merge request !1999

fix typo

See merge request !1997

Resolve "update supported RFC list"

Closes #1061

See merge request !1972

Fix a possible race between udp dispatch and socket code

Closes #943

See merge request !1992

There's a small possibility of race between udp dispatcher and
socket code - socket code can still hold internal reference to a
socket while dispatcher calls isc_socket_open, which can cause
an assertion failure. Fix it by relaxing the assertion test, and
instead simply locking the socket in isc_socket_open.

Don't SERVFAIL on lame delegations when doing qname minimization in relaxed mode

Closes #1055

See merge request !1962

qname minimization, even in relaxed mode, can fail on
some very broken domains. In relaxed mode, instead of
asking for "foo.bar NS" ask for "_.foo.bar A" to either
get a delegation or NXDOMAIN. It will require more queries
than regular mode for proper NXDOMAINs.

qname minimization in relaxed mode should fall back to regular
resolution in case of failure.

configure option to use pthread_rwlock instead of internal implementation

See merge request !1397

Enable nolibtool build in CI

See merge request !1953