errors in debug builds when maintainer mode is on

After 5.6.22 and 5.5.41 merges mysql maintainer mode is turned on by default for debug builds on linux which currently reports some warnings as errors.
Those errors need to be resolved but as current workaround we will disable mysql maintainer mode in debug builds for releases.

Some of the errors seen:
PS 5.5 on ubuntu lucid:
13:34:33 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-lucid-64bit/percona-server-5.5-5.5.41-rel37.0/plugin/semisync/semisync_master.cc: In member function 'int ReplSemiSyncMaster::readSlaveReply(NET*, uint32, const char*)':
13:34:33 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-lucid-64bit/percona-server-5.5-5.5.41-rel37.0/plugin/semisync/semisync_master.cc:1058: error: 'start_ts.timespec::tv_nsec' may be used uninitialized in this function
13:34:33 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-lucid-64bit/percona-server-5.5-5.5.41-rel37.0/plugin/semisync/semisync_master.cc:1058: error: 'start_ts.timespec::tv_sec' may be used uninitialized in this function

PS 5.5 on ubuntu trusty:
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c: In function 'int do_div_mod(const decimal_t*, const decimal_t*, decimal_t*, decimal_t*, int)':
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:2137:59: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (i= (prec2 - 1) % DIG_PER_DEC1; *buf2 < powers10[i--]; prec2--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:2152:56: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (i=(prec1-1) % DIG_PER_DEC1; *buf1 < powers10[i--]; prec1--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:2137:59: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (i= (prec2 - 1) % DIG_PER_DEC1; *buf2 < powers10[i--]; prec2--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:2152:56: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (i=(prec1-1) % DIG_PER_DEC1; *buf1 < powers10[i--]; prec1--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c: In function 'int decimal_actual_fraction(decimal_t*)':
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:300:30: error: array subscript is above array bounds [-Werror=array-bounds]
13:39:24 *buf0 % powers10[i++] == 0;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:300:30: error: array subscript is above array bounds [-Werror=array-bounds]
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c: In function 'int decimal2string(const decimal_t*, char*, int*, int, int, char)':
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:264:60: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (i= (intg - 1) % DIG_PER_DEC1; *buf0 < powers10[i--]; intg--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:264:60: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c: In function 'int decimal2bin(decimal_t*, uchar*, int, int)':
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:264:60: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (i= (intg - 1) % DIG_PER_DEC1; *buf0 < powers10[i--]; intg--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:264:60: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c: In function 'int decimal_shift(decimal_t*, int)':
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:478:35: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (; *buf_beg < powers10[i--]; start++) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:478:35: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:496:33: error: array subscript is above array bounds [-Werror=array-bounds]
13:39:24 for (; *buf_end % powers10[i++] == 0; stop--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:496:33: error: array subscript is above array bounds [-Werror=array-bounds]
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c: In function 'int decimal_intg(const decimal_t*)':
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:264:60: error: array subscript is below array bounds [-Werror=array-bounds]
13:39:24 for (i= (intg - 1) % DIG_PER_DEC1; *buf0 < powers10[i--]; intg--) ;
13:39:24 ^
13:39:24 /mnt/workspace/percona-server-5.5-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.5-5.5.41-rel37.0/strings/decimal.c:264:60: error: array subscript is below array bounds [-Werror=array-bounds]

PS 5.6 on ubuntu trusty:
07:35:59 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.6-5.6.22-71.0/storage/perfschema/pfs_digest.cc: In function 'PSI_digest_locker* pfs_digest_add_token_v1(PSI_digest_locker*, uint, OPAQUE_LEX_YYSTYPE*)':
07:35:59 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.6-5.6.22-71.0/storage/perfschema/pfs_digest.cc:518:67: error: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Werror=strict-overflow]
07:35:59 DBUG_ASSERT(index + PFS_SIZE_OF_A_TOKEN <= digest->m_byte_count);
07:35:59 ^
07:35:59 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.6-5.6.22-71.0/storage/perfschema/pfs_digest.cc:518:67: error: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Werror=strict-overflow]
07:35:59 DBUG_ASSERT(index + PFS_SIZE_OF_A_TOKEN <= digest->m_byte_count);
07:35:59 ^
07:35:59 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.6-5.6.22-71.0/storage/perfschema/pfs_digest.cc:518:67: error: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Werror=strict-overflow]
07:35:59 DBUG_ASSERT(index + PFS_SIZE_OF_A_TOKEN <= digest->m_byte_count);
07:35:59 ^
07:35:59 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.6-5.6.22-71.0/storage/perfschema/pfs_digest.cc:518:67: error: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Werror=strict-overflow]
07:35:59 DBUG_ASSERT(index + PFS_SIZE_OF_A_TOKEN <= digest->m_byte_count);
07:35:59 ^
07:35:59 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-trusty-64bit/percona-server-5.6-5.6.22-71.0/storage/perfschema/pfs_digest.cc:518:67: error: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Werror=strict-overflow]
07:35:59 DBUG_ASSERT(index + PFS_SIZE_OF_A_TOKEN <= digest->m_byte_count);

PS 5.6 on ubuntu precise:
07:36:28 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-precise-64bit/percona-server-5.6-5.6.22-71.0/sql/ha_partition.cc: In member function ‘virtual enum_alter_inplace_result ha_partition::check_if_supported_inplace_alter(TABLE*, Alter_inplace_info*)’:
07:36:28 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-precise-64bit/percona-server-5.6-5.6.22-71.0/sql/ha_partition.cc:251:3: error: ‘new_field’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
07:36:28 if (!new_field)
07:36:28 ^
07:36:28 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-precise-64bit/percona-server-5.6-5.6.22-71.0/sql/ha_partition.cc:237:17: note: ‘new_field’ was declared here
07:36:28 Create_field *new_field;
07:36:28 ^
07:36:28 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-precise-64bit/percona-server-5.6-5.6.22-71.0/sql/ha_partition.cc:251:3: error: ‘new_field’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
07:36:28 if (!new_field)
07:36:28 ^
07:36:28 /mnt/workspace/percona-server-5.6-debian-binary/label_exp/ubuntu-precise-64bit/percona-server-5.6-5.6.22-71.0/sql/ha_partition.cc:237:17: note: ‘new_field’ was declared here
07:36:28 Create_field *new_field;

PS 5.6 on debian6-32:
07:37:58 /home/jenkins/workspace/percona-server-5.6-debian-binary-32/label_exp/debian6-32/percona-server-5.6-5.6.22-71.0/sql/sql_parse.cc: In function 'int mysql_execute_command(THD*)':
07:37:58 /home/jenkins/workspace/percona-server-5.6-debian-binary-32/label_exp/debian6-32/percona-server-5.6-5.6.22-71.0/sql/sql_parse.cc:2609: error: 'per_query_variables_backup' may be used uninitialized in this function

PS 5.6 on ubuntu lucid:
07:36:41 /mnt/workspace/percona-server-5.6-debian-binary-32/label_exp/ubuntu-lucid-64bit/percona-server-5.6-5.6.22-71.0/sql/sql_acl.cc: In member function 'bool Rsa_authentication_keys::read_key_file(RSA**, bool, char**)':
07:36:41 /mnt/workspace/percona-server-5.6-debian-binary-32/label_exp/ubuntu-lucid-64bit/percona-server-5.6-5.6.22-71.0/sql/sql_acl.cc:12122: error: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result