Bug#21476: (Thread stack overrun not caught, causing SEGV)

The STACK_MIN_SIZE is currently set to 8192, when we actually need 
(emperically discovered) 9236 bytes to raise an fatal error, on Ubuntu 
Dapper Drake, libc6 2.3.6-0ubuntu2, Linux kernel 2.6.15-27-686, on x86.

I'm taking that as a new lower bound, plus 100B of wiggle-room for sundry
word sizes and stack behaviors.

The added test verifies in a cross-platform way that there are no gaps 
between the space that we think we need and what we actually need to report 
an error.

DOCUMENTERS:  This also adds "let" to the mysqltest commands that evaluate
an argument to expand variables therein.  (Only right of the "=", of course.)


client/mysqltest.c:
  Add "let" to the list of mysqltest commands that evaluates its arguments (only
  the right-hand-side of the equals-sign expression).
mysql-test/r/mysqltest.result:
  Added test to show that mysqltest "let" will evaluate the RHS correctly (and 
  expand the backslash test).
mysql-test/t/mysqltest.test:
  Added test to show that mysqltest "let" will evaluate the RHS correctly (and 
  expand the backslash test).
sql/mysql_priv.h:
  Increase the amount we require to be available for the stack, since 
  experience told us that the previous amount was too little by at least
  1044 bytes.
mysql-test/r/execution_constants.result:
  New BitKeeper file ``mysql-test/r/execution_constants.result''
mysql-test/t/execution_constants.test:
  New BitKeeper file ``mysql-test/t/execution_constants.test''

1 files changed, 12 insertions, 0 deletions

diff --git a/mysql-test/r/execution_constants.result b/mysql-test/r/execution_constants.result
new file mode 100644
index 00000000000..293c88dc506
--- /dev/null
+++ b/mysql-test/r/execution_constants.result
@@ -0,0 +1,12 @@
+CREATE TABLE `t_bug21476` (
+`ID_BOARD` smallint(5) unsigned NOT NULL default '0',
+`ID_MEMBER` mediumint(8) unsigned NOT NULL default '0',
+`logTime` int(10) unsigned NOT NULL default '0',
+`ID_MSG` mediumint(8) unsigned NOT NULL default '0',
+PRIMARY KEY  (`ID_MEMBER`,`ID_BOARD`),
+KEY `logTime` (`logTime`)
+) ENGINE=MyISAM DEFAULT CHARSET=cp1251 COLLATE=cp1251_bulgarian_ci;
+INSERT INTO `t_bug21476` VALUES (2,2,1154870939,0),(1,2,1154870957,0),(2,183,1154941362,0),(2,84,1154904301,0),(1,84,1154905867,0),(2,13,1154947484,10271),(3,84,1154880549,0),(1,6,1154892183,0),(2,25,1154947581,10271),(3,25,1154904760,0),(1,25,1154947373,10271),(1,179,1154899992,0),(2,179,1154899410,0),(5,25,1154901666,0),(2,329,1154902026,0),(3,329,1154902040,0),(1,329,1154902058,0),(1,13,1154930841,0),(3,85,1154904987,0),(1,183,1154929665,0),(3,13,1154931268,0),(1,85,1154936888,0),(1,169,1154937959,0),(2,169,1154941717,0),(3,183,1154939810,0),(3,169,1154941734,0);
+Assertion: mysql_errno 1436 == 1436
+DROP TABLE `t_bug21476`;
+End of 5.0 tests.