just in case old linux is used, add _GNU_SOURCE preprocessor constant to be able to see pthread_rwlock_t

-lm is sometimes not linked, which causes errors about undefined rint()
- FreeBSD embedded library does not link with the flags returned by mysql_config
 (added -lcrypt to LIBS, whereby causing overlinking in case of normal non-embedded client)

Init MY_PTHREAD_MUTEX_FAST prior to first usage to avoid crash on
FreeBSD

No commit message

honor OUTPUT_NAME in MERGE_LIBRARIES macro

DISABLE_MYSQL_THREAD_H for strings
Also, enable unittests for perfschema

add WITH_MYSQLD_LIBS for extra linker flags for mysqld

Part V: performance schema implementation

Original revision:
------------------------------------------------------------
revno: 3817
revision-id: guilhem@mysql.com-20100108092756-k0zzf4kvx9b7bh38
parent: guilhem@mysql.com-20100107101133-hrrgcdqg508runuf
committer: Guilhem Bichot <guilhem@mysql.com>
branch nick: mysql-6.0-codebase-bugfixing
timestamp: Fri 2010-01-08 10:27:56 +0100
message:
  fix for BUG#50120 "Valgrind errors in any test, inside mysqltest"
  Problem was that as v->name[v->name_len] may be uninitialized (which is ok per se),
  it shouldn't be used in an if(). We remove this zero_the_char/restore_it logic by
  rather zero-terminating the v->name string when we create it in var_init().
------------------------------------------------------------

Original revision:

------------------------------------------------------------
revno: 3789.1.9
revision-id: serg@mysql.com-20091229134448-phe834ukzmi0k2e3
parent: serg@mysql.com-20091227081418-bgfg952gzumn1k3h
committer: Sergei Golubchik <serg@mysql.com>
branch nick: 6.0-codebase
timestamp: Tue 2009-12-29 14:44:48 +0100
message:
  better fix for Bug#48758 mysqltest crashes on sys_vars.collation_server_basic in gcov builds
  
  use setenv instead of putenv
------------------------------------------------------------

Add mysql_release.cmake intended for use by the build team (
compile options, build settings to do MySQL releases)

(handle dependent options, allow user with change WITH_READLINE to
WITH_LIBEDIT and other way around after the first compile)

Part IV: sql instrumentation