The reason is the missing HAVE_OPENSSL define for mariabackup.

The following variables are used in this project, but they are set to NOTFOUND.
LZ4_LIBS

The reason for the failure is that pkg_check_modules will not guarantee
<prefix>_LIBRARY_DIRS variable to be set, according to documentation.
When it's not set, we would force find_library to look in an empty path
and thus fail to correctly find LZ4_LIBS, although pck_check_modules
did previously discover that the library is installed.

To fix the problem and still keep the logic of first following
LIBLZ4_LIBRARY_DIRS and *then* look at other paths, we call find_library
twice. This is the recommended approach, according to CMake 3.11
documentation.

-fno-tree-loop-vectorize is only supported by gcc versions >5.

MDEV-15216 Assertion `! is_set() || m_can_overwrite_status' failed in Diagnostics_area::set_error_status upon operation inside XA

don't implicitly commit or rollback in mysql_admin_table()
unless the statement has CF_IMPLICIT_COMMIT_END flag.

ha_innobase::commit_inplace_alter_table(): Defer the freeing of ctx->trx
until after the operation has been successfully committed. In this way,
rollback on a partitioned table will be possible.

rollback_inplace_alter_table(): Handle ctx->new_table == NULL when
ctx->trx != NULL.

don't memcmp beyond the first argument's end

Also:
  use my_strcasecmp(table_alias_charset), like elsewhere, not memcmp

If the tablespace is dropped or truncated after the
space->is_stopping() check in fil_crypt_get_page_throttle_func(),
we would proceed to request the page, and eventually report a fatal
error.

buf_page_get_gen(): Do not retry reading if mode==BUF_GET_POSSIBLY_FREED.

lock_rec_block_validate(): Be prepared for a NULL return value when
invoking buf_page_get_gen() with mode=BUF_GET_POSSIBLY_FREED.

storage/connect/tabjson.cpp:198:10: warning: converting to non-pointer type ‘int’ from NULL [-Wconversion-null]
   return NULL;

Call _exit() from signal handler. main() can just do return.

Merge a fix from MySQL 8.0.11.

row_log_table_apply_delete(): Remove the unused parameter thr.
(This removal was not part of the Oracle fix.)

Issue:
------
Prefix for externally stored columns were being stored in online_log when a
table is altered and alter causes table to be rebuilt. Space in online_log is
limited and if length of prefix of externally stored columns is very big, then
it is being written to online log without making sure if it fits. This leads to
memory corruption.

Fix:
----
After fix for Bug#16544143, there is no need to store prefixes of externally
stored columnd in online_log. Thus remove the code which stores column prefixes
for externally stored columns. Also, before writing anything on online_log,
make sure it fits to available memory to avoid memory corruption.

Read RB page for more details.
Reviewed-by: Annamalai Gurusami <annamalai.gurusami@oracle.com>
RB: 18239

a better fix

MDEV-15803 Fix and re-enable test galera_var_auto_inc_control_on

Save / restore auto_increment_offset in test galera_gcs_fragment

MDEV-15794 Fix and re-enable test galera_var_retry_autocommit

MDEV-13549 Record and re-enable galera_ist_mysqldump

Test galera_gcs_fragment performs cluster reconfiguration, so
`auto_increment_offset` may change, and check test case at the
end of test fails.

fix another similar line

followup for 7828ba0d

The test assumes that `@@global.auto_increment_offset` is equal to
`wsrep_local_index + 1`. Which is normally the case if galera runs
with option `wsrep_auto_increment_control` enabled.
However, if some prior test performs a restart of a server, then
`wsrep_local_index` may change, and galera will set the value of
`auto_increment_offset` accordingly.
However, if `auto_increment_offset` changes during a test run, then
mtr will complain. To avoid that, tests that perform restarts include
`auto_increment_offset_save.inc` and `auto_increment_offset_restore.inc`.
Which reset the value of `auto_increment_offset`. And when that
happens, `auto_increment_offset` will no longer be equal to
`wsrep_local_index + 1`, and the test fails.
To avoid this problem, simply check that the offsets are different
on the nodes that compose the cluster.

MDEV-16005 sporadic failures with galera tests MW-328B and MW-328C

In commit e7f4e61f
the call fil_flush_file_spaces(FIL_LOG) is necessary.
Tablespaces will be flushed as part of the redo log
checkpoint, but the redo log will not necessarily
be flushed, depending on innodb_flush_method.

commit c545d544378483bf68c4fb713cd4ec872d0df2c4
Author: Olivier Bertrand <bertrandop@gmail.com>
Date:   Tue Mar 27 23:13:14 2018 +0200

    - Fix MDEV-15577 CONNECT engine JDBC remote index prevents UPDATE
      Fixed in TDBJDBC::OpenDB because query can be null for updates
      modified:   storage/connect/tabjdbc.cpp

commit c4f1fe2e8e74566e9c3296f435448d9f5c718b23
Author: Olivier Bertrand <bertrandop@gmail.com>
Date:   Wed Mar 14 12:21:17 2018 +0100

    - Fix MDEV-15429 CONNECT engine JDBC handling Postgresql UUID type
      Also handle Postgresql sending type VARCHAR for TEXT column and
      setting length to b x7FFFFFF when the length is unknown.
      modified:   storage/connect/Client.java
      modified:   storage/connect/JavaWrappers.jar
      modified:   storage/connect/JdbcInterface.java
      modified:   storage/connect/PostgresqlInterface.java
      modified:   storage/connect/global.h
      modified:   storage/connect/ha_connect.cc
      modified:   storage/connect/jdbconn.cpp
      modified:   storage/connect/jdbconn.h
      modified:   storage/connect/mysql-test/connect/r/jdbc_postgresql.result
      modified:   storage/connect/mysql-test/connect/t/jdbc_postgresql.test
      modified:   storage/connect/mysql-test/connect/t/jdbconn.inc
      modified:   storage/connect/plgdbsem.h
      modified:   storage/connect/tabjdbc.cpp
      modified:   storage/connect/tabjdbc.h
      added:      storage/connect/mysql-test/connect/std_data/JavaWrappers.jar

commit 3068bb4882a316c6c32c624609db2bf24ae3ad40
Author: Olivier Bertrand <bertrandop@gmail.com>
Date:   Mon Feb 26 19:40:27 2018 +0100

    Revert to old cmake file to avoid compile error

commit da8c1c0bd6a327fd03bd321be3170f468122ef67
Author: Olivier Bertrand <bertrandop@gmail.com>
Date:   Mon Feb 26 16:13:39 2018 +0100

    - Remove warning on not used tabtyp variable in connect_assisted_discovery
      modified:   storage/connect/ha_connect.cc

    - Fix a bug causing CONNECT to loop when expanding a JSON column
      when the expanded column value is null or void array.
    - Adding the FullArray option to JSON tables.
    - Skipping expanded JSON lines when the expanded column value is null.
      modified:   storage/connect/connect.cc
      modified:   storage/connect/tabdos.h
      modified:   storage/connect/tabjson.cpp
      modified:   storage/connect/tabjson.h

    - Fix MDEV-13353 No file privilege for ODBC, JDBC, MONGO, MAC, WMI file types.
      modified:   storage/connect/ha_connect.cc

    - Make some Json UDFs  to accept a non JSON item as 1st parameter.
      modified:   storage/connect/json.cpp
      modified:   storage/connect/json.h
      modified:   storage/connect/jsonudf.cpp
      modified:   storage/connect/jsonudf.h

    - Update Json UDF tests to cope with above changes.
      modified:   storage/connect/mysql-test/connect/r/json_udf.result
      modified:   storage/connect/mysql-test/connect/r/json_udf_bin.result
      modified:   storage/connect/mysql-test/connect/r/vcol.result
      modified:   storage/connect/mysql-test/connect/t/json_udf.test
      modified:   storage/connect/mysql-test/connect/t/vcol.test

    - Fix some compiler warning treated as error
      PlugSubAlloc no more exported because it does throw.
      modified:   storage/connect/global.h
      modified:   storage/connect/ha_connect.cc
      modified:   storage/connect/jsonudf.cpp
      modified:   storage/connect/tabjson.cpp
      modified:   storage/connect/tabjson.h

    - Other files modified (?) when going back to wrong merge
      modified:   storage/connect/CMakeLists.txt
      modified:   storage/connect/array.cpp
      modified:   storage/connect/colblk.cpp
      modified:   storage/connect/connect.cc
      modified:   storage/connect/csort.cpp
      modified:   storage/connect/domdoc.cpp
      modified:   storage/connect/filamap.cpp
      modified:   storage/connect/filamgz.cpp
      modified:   storage/connect/filamtxt.cpp
      modified:   storage/connect/filamzip.cpp
      modified:   storage/connect/filter.cpp
      modified:   storage/connect/fmdlex.c
      modified:   storage/connect/jdbconn.cpp
      modified:   storage/connect/macutil.cpp
      modified:   storage/connect/myconn.cpp
      modified:   storage/connect/odbconn.cpp
      modified:   storage/connect/plgdbutl.cpp
      modified:   storage/connect/plugutil.cpp
      modified:   storage/connect/preparse.h
      modified:   storage/connect/rcmsg.c
      modified:   storage/connect/rcmsg.h
      modified:   storage/connect/reldef.cpp
      modified:   storage/connect/tabdos.cpp
      modified:   storage/connect/tabfmt.cpp
      modified:   storage/connect/tabmac.cpp
      modified:   storage/connect/tabmul.cpp
      modified:   storage/connect/tabmysql.cpp
      modified:   storage/connect/tabmysql.h
      modified:   storage/connect/tabodbc.cpp
      modified:   storage/connect/tabtbl.cpp
      modified:   storage/connect/tabxml.cpp
      modified:   storage/connect/value.cpp
      modified:   storage/connect/xobject.cpp

commit 5095628b31ed8c94bd7c794c6b0162894a9040b1
Author: Olivier Bertrand <bertrandop@gmail.com>
Date:   Tue Feb 13 14:29:00 2018 +0100

    - Fix a bug causing CONNECT to loop when expanding a JSON column
      when the expanded column value is null or void array.
    - Adding the FullArray option to JSON tables.
    - Skipping expanded JSON lines when the expanded column value is null.
      modified:   storage/connect/connect.cc
      modified:   storage/connect/tabdos.h
      modified:   storage/connect/tabjson.cpp
      modified:   storage/connect/tabjson.h

commit 9896174328da42016735630c893fd09eb128b48e
Author: Olivier Bertrand <bertrandop@gmail.com>
Date:   Fri Feb 2 15:48:57 2018 +0100

    - Remove warning on not used tabtyp variable in connect_assisted_discovery
      modified:   storage/connect/ha_connect.cc

commit d7e254c05f88173eb04d8dafc813013eb42ccdbe
Author: Olivier Bertrand <bertrandop@gmail.com>
Date:   Wed Jan 31 14:42:45 2018 +0100

    - Use delayed load for the MongoDB C Drive on Windows
      modified:   storage/connect/CMakeLists.txt
      modified:   storage/connect/cmgoconn.cpp
      modified:   storage/connect/ha_connect.cc

    - Add FORCE to the connect_type_conv enum values
      This will translate binary values to TYPE_STRING
      modified:   storage/connect/checklvl.h
      modified:   storage/connect/ha_connect.cc
      modified:   storage/connect/odbconn.cpp

    - Change the connect_xtrace variable to from int to set
      modified:   storage/connect/array.cpp
      modified:   storage/connect/blkfil.cpp
      modified:   storage/connect/block.h
      modified:   storage/connect/cmgoconn.cpp
      modified:   storage/connect/colblk.cpp
      modified:   storage/connect/connect.cc
      modified:   storage/connect/filamap.cpp
      modified:   storage/connect/filamdbf.cpp
      modified:   storage/connect/filamfix.cpp
      modified:   storage/connect/filamgz.cpp
      modified:   storage/connect/filamtxt.cpp
      modified:   storage/connect/filamvct.cpp
      modified:   storage/connect/filamzip.cpp
      modified:   storage/connect/filter.cpp
      modified:   storage/connect/global.h
      modified:   storage/connect/ha_connect.cc
      modified:   storage/connect/inihandl.cpp
      modified:   storage/connect/javaconn.cpp
      modified:   storage/connect/jdbconn.cpp
      modified:   storage/connect/jmgfam.cpp
      modified:   storage/connect/jmgoconn.cpp
      modified:   storage/connect/json.cpp
      modified:   storage/connect/jsonudf.cpp
      modified:   storage/connect/libdoc.cpp
      modified:   storage/connect/mongo.cpp
      modified:   storage/connect/mycat.cc
      modified:   storage/connect/myconn.cpp
      modified:   storage/connect/odbconn.cpp
      modified:   storage/connect/plgdbutl.cpp
      modified:   storage/connect/plugutil.cpp
      modified:   storage/connect/reldef.cpp
      modified:   storage/connect/tabcol.cpp
      modified:   storage/connect/tabdos.cpp
      modified:   storage/connect/tabext.cpp
      modified:   storage/connect/tabfix.cpp
      modified:   storage/connect/tabfmt.cpp
      modified:   storage/connect/tabjdbc.cpp
      modified:   storage/connect/tabjson.cpp
      modified:   storage/connect/table.cpp
      modified:   storage/connect/tabmul.cpp
      modified:   storage/connect/tabmysql.cpp
      modified:   storage/connect/tabodbc.cpp
      modified:   storage/connect/tabpivot.cpp
      modified:   storage/connect/tabsys.cpp
      modified:   storage/connect/tabtbl.cpp
      modified:   storage/connect/tabutil.cpp
      modified:   storage/connect/tabvct.cpp
      modified:   storage/connect/tabwmi.cpp
      modified:   storage/connect/tabxml.cpp
      modified:   storage/connect/user_connect.cc
      modified:   storage/connect/valblk.cpp
      modified:   storage/connect/value.cpp
      modified:   storage/connect/xindex.cpp

    - Restore connect_enable_mongo variable (but undocumented)
      modified:   storage/connect/ha_connect.cc
      modified:   storage/connect/mycat.cc
      modified:   storage/connect/mysql-test/connect/r/json_java_2.result
      modified:   storage/connect/mysql-test/connect/r/json_java_3.result
      modified:   storage/connect/mysql-test/connect/r/json_mongo_c.result
      modified:   storage/connect/mysql-test/connect/r/mongo_c.result
      modified:   storage/connect/mysql-test/connect/r/mongo_java_2.result
      modified:   storage/connect/mysql-test/connect/r/mongo_java_3.result
      modified:   storage/connect/mysql-test/connect/r/tbl_thread.result
      modified:   storage/connect/mysql-test/connect/t/mongo.inc
      modified:   storage/connect/mysql-test/connect/t/mongo_test.inc
      modified:   storage/connect/mysql-test/connect/t/tbl_thread.test