Rows_log_event::change_to_flashback_event(): Reduce the scope
of the variable swap_buff2, and do not duplicate conditions.

GCC 9.3.0 flagged the -Wmaybe-uninitialized when compiling the
10.5 branch using cmake -DWITH_ASAN=ON -DCMAKE_CXX_FLAGS=-O2

Function os_file_get_last_error_low returns error number +
OS_FILE_ERROR_MAX (which is currently set to 200) for unknown numbers to
this program.

myrg_open(): Reduce the scope of the variable 'end' and
simplify the code.

For some reason, I got no warning for this code in the 10.2
branch, only 10.3 or later.

The ENGINE=MERGE is covered by the tests main.merge, main.merge_debug,
and main.merge-big.

Problem:
=======
When we upgrade from "mysql" to "mariadb" if slave is using repositories as
tables their data is completely ignored and no warning is issued in error log.

Fix:
===
"mysql_upgrade" test should check for the presence of data in
"mysql.slave_master_info" and "mysql.slave_relay_log_info" tables. When tables
have some data the upgrade script should report a warning which hints users
that the data in repository tables will be ignored.

_ma_fetch_keypage(): Correct an assertion that used to always hold.
Thanks to clang -Wint-in-bool-context for flagging this.

double_to_datetime_with_warn(): Suppress -Wimplicit-int-float-conversion
by adding a cast. LONGLONG_MAX converted to double will actually be
LONGLONG_MAX+1.

All tablespace metadata is buffered in fil_system. There is a LRU
mechanism, but that only controls the opening and closing of
fil_node_t::handle.

It is much more efficient and less error-prone to access data file names
by looking up the fil_space_t object rather than by essentially joining
each row with an access to SYS_DATAFILES via the InnoDB internal SQL parser.

dict_get_first_path(): Declare static. The function may only be needed
when loading or updating the data dictionary. Also, change a condition
in order to avoid a bogus GCC 10 -Wstringop-overflow warning for
mem_strdupl() about len==ULINT_UNDEFINED.

i_s_sys_tablespaces_fill_table(): Do not access other InnoDB internal
dictionary tables than SYS_TABLESPACES.

This fixes GCC 10.0.1 -Wstringop-truncation and some typos.

actually, page_zip_verify_checksum() generally allows all-zeroes
checksums because our CRC32 checksum is something like
crc_1 ^ crc_2 ^ crc_3

Also, all zeroes page is considered correct.

As a side effect fix nasty reinterpret_cast<> UB

Also, since c0f47a4a innodb_checksum_algorithm=full_crc32
exists which computes CRC32 in one go (without bitwise arithmetic)

Also, remove some trailing white space and add missing static
qualifier to free_annotate_event().

It was:
implicit conversion from 'ha_rows' (aka 'unsigned long long') to 'double'
changes value from 18446744073709551615 to 18446744073709551616

Follow what JOIN::get_examined_rows() does for similar code.

Re-enable main.mysql_client_test on all builders, because
at the moment we do not run any --big-test on buildbot
due to resource constraints.

A number of tests were declared big in
commit eeee1832
in an attempt to save resources on buildbot.

Stop masking the Data_free values, because innodb_file_per_table=1
is the default.

Also, do mask Update_time after updating tables, even though for
some reason it does appear to matter.

Change events only on Galera environment where idea is that
event is enabled only on one node of the cluster and nodes
are identified by server_id.

* Small refactor of my_getncpus function to compile for very old glibc < 2.6.
* Cleanup code to eliminate duplication.

Cleanup install_layout to account for multi-arch setup and remove
redundant defines in debian rules.
Signed-off-by: Vicențiu Ciorbaru <vicentiu@mariadb.org>

The .pc file installed by mariadb mentions archful directories and
therefore must be archful itself.

This fixes MDEV-14340.

status threads_connected can temporarily be bigger than max_connections+1

If SHOW STATUS LIKE "Threads_connected" comes after
ER_CON_COUNT_ERROR is sent to the client, but before the counter is
decremented, Threads_connected can differ from the expected value.

When installing, no headers are installed into the parent directory of
`${includedir}`.

cmake cannot detect openssl headers on Mac during checks.
the solution is to add path to openssl includes to
CMAKE_REQUIRED_INCLUDES before checks.

added cmake checks for pam_ext.h and pam_appl.h headers
added check for pam_syslog()
added pam_syslog() if doesn't exist
all cmake checks performed from inside the plugin

If async replication slave thread conflicts with cluster replication,
then the async slave transaction should be BF aborted, and depending on the
state of async slave transaction execution, potentially also replayed.
There were problems in such BF abort implementation and the replaying was not
started.
This pull request contains fixes which make sure that if async slave thread is
marked to abort and replay, it will complete carry out the rollback and
release all locks and resources before starting the replaying. After replaying,
async slave transactions is treated as successful, so the slave thread will
continue as usual, handling next replication event.

There is also new mtr test: galera.galera_slave_replay, which stresses both a
certification failure for async slave thread and a successful BF abort
followed by replaying.

MDEV-21374: When "--help --verbose" prints out configuration file paths, the --defaults-file option is not considered

* `--defaults-file` option is showed only in `--help --verbose` if
applied
* `--default-extra-file` is showing correctly now in `--help --verbose`,
previously it was treated as a directory with appended `my.cnf`

- Add warning suppression in misc_debug2 test.