Bug #35999 When using the embedded server a wrong error message comes.

Description:
The following test failed running with an embedded server:

main.slave_compressed_protocol_basic [ fail ]

mysqltest: At line 45: query 'SET @@global.slave_compressed_protocol = DEFAULT' failed: 1230: Variable 'slave_compressed_protocol' doesn't have a default value

The result from queries just before the failure was:
SET @global_start_value = @@global.slave_compressed_protocol;
SELECT @global_start_value;
@global_start_value
0
'#--------------------FN_DYNVARS_147_01------------------------#'
SET @@global.slave_compressed_protocol = 1;
SET @@global.slave_compressed_protocol = DEFAULT;

More results from queries before failure can be found in /dev/shm/var-embedded-101/log/slave_compressed_protocol_basic.log

Stopping All Servers
Restoring snapshot of databases
Resuming Tests

That the variable would have no default is simply not true (see manual).

How to repeat:
execute the test mentioned above with the embedded server.

Suggested fix:
Better error message.

Thank you for the report.

Verified as described using just query:

SET @@global.slave_compressed_protocol = DEFAULT;

I don't see the slave_compressed_protocol_basic.test in the 5.1 tree - probably it's in the release tree only by now.
Still as the 'slave_compressed_protocol' only has sence with the replication (which is not available in the embedded server) i belive we have to add
--source include/have_log_bin.inc
or
--source include/not_embedded.inc

Will fix it that way when i see the code.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

http://lists.mysql.com/commits/47883

 2656 Alexey Botchkov	2008-06-16
      Bug #35999 When using the embedded server a wrong message comes.
      
      HAVE_REPLICATION was on for the embedded server as the #define was in wrong place.

Pushed into 5.1.31  (revid:holyfoot@mysql.com-20080616030445-y655mczli0fb0nf5) (version source revid:patrick.crews@sun.com-20081126180318-v685u61mpgoc176x) (pib:5)

Pushed into 6.0.9-alpha  (revid:holyfoot@mysql.com-20080616030445-y655mczli0fb0nf5) (version source revid:ingo.struewing@sun.com-20081121151447-dtf2ofz2ys0zqed1) (pib:5)

Noted in 5.1.31, 6.0.9 changelog.

Setting the slave_compressed_protocol system variable to DEFAULT
failed in the embedded server.

Pushed into 5.1.31-ndb-6.2.17 (revid:tomas.ulin@sun.com-20090119095303-uwwvxiibtr38djii) (version source revid:tomas.ulin@sun.com-20090108105244-8opp3i85jw0uj5ib) (merge vers: 5.1.31-ndb-6.2.17) (pib:6)

Pushed into 5.1.31-ndb-6.3.21 (revid:tomas.ulin@sun.com-20090119104956-guxz190n2kh31fxl) (version source revid:tomas.ulin@sun.com-20090119104956-guxz190n2kh31fxl) (merge vers: 5.1.31-ndb-6.3.21) (pib:6)

Pushed into 5.1.31-ndb-6.4.1 (revid:tomas.ulin@sun.com-20090119144033-4aylstx5czzz88i5) (version source revid:tomas.ulin@sun.com-20090119144033-4aylstx5czzz88i5) (merge vers: 5.1.31-ndb-6.4.1) (pib:6)