Bug#37003 Tests sporadically crashes with embedded server

The problem was that when a embedded linked version of mysqltest
crashed there was no way to obtain a stack trace if no core file
is available. Another problem is that the embedded version of
libmysql was not behaving (crash) the same as the non-embedded with
respect to sending commands to a explicitly closed connection.

The solution is to generate a mysqltest's stack trace on crash
and to enable "reconnect" if the connection handle was explicitly
closed so the behavior matches the non-embedded one.

client/CMakeLists.txt:
  Link mysys to mysqltest.
client/Makefile.am:
  Link mysys to mysqltest.
client/mysqltest.c:
  Add fatal signal handling with backtracing for Unix and Windows.
configure.in:
  Add check for weak symbols support and remove a spurious word.
include/Makefile.am:
  Add new header with prototype for stack tracing functions.
include/my_stacktrace.h:
  Add new header with prototype for stack tracing functions.
libmysqld/CMakeLists.txt:
  stack tracing is now part of mysys.
libmysqld/Makefile.am:
  stack tracing is now part of mysys.
libmysqld/lib_sql.cc:
  Re-connect if connection was explicitly closed. This is
  done to match the behavior of the non-embeded libmysql.
mysql-test/t/sql_low_priority_updates_func.test:
  Test expects parallelism between queries that cannot be
  guaranteed under embedded.
mysys/CMakeLists.txt:
  Add stacktrace to mysys.
mysys/Makefile.am:
  Add stacktrace to mysys.
mysys/stacktrace.c:
  Move stacktrace to mysys and add weak symbol for the
  C++ name de-mangling function so that it can later be
  overridden in C++ code. Also add my_ prefix to exported
  functions.
sql/CMakeLists.txt:
  stacktrace was moved to mysys.
sql/Makefile.am:
  stacktrace was moved to mysys.
sql/mysqld.cc:
  Add my_ prefix to mysys functions.

1 files changed, 0 insertions, 69 deletions

diff --git a/sql/stacktrace.h b/sql/stacktrace.h
deleted file mode 100644
index 498f4f197fc..00000000000
--- a/sql/stacktrace.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/* Copyright (C) 2000 MySQL AB
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
-
-#ifdef	__cplusplus
-extern "C" {
-#endif
-
-#if HAVE_BACKTRACE && HAVE_BACKTRACE_SYMBOLS && HAVE_CXXABI_H && HAVE_ABI_CXA_DEMANGLE
-#define BACKTRACE_DEMANGLE 1
-#endif
-
-#if BACKTRACE_DEMANGLE
-char *my_demangle(const char *mangled_name, int *status);
-#endif
-
-#ifdef TARGET_OS_LINUX
-#if defined(HAVE_STACKTRACE) || (defined (__x86_64__) || defined (__i386__) || (defined(__alpha__) && defined(__GNUC__)))
-#undef HAVE_STACKTRACE
-#define HAVE_STACKTRACE
-
-extern char* __bss_start;
-extern char* heap_start;
-
-#define init_stacktrace() do {                                 \
-                            heap_start = (char*) &__bss_start; \
-                          } while(0);
-void check_thread_lib(void);
-#endif /* defined (__i386__) || (defined(__alpha__) && defined(__GNUC__))) */
-#elif defined (__WIN__)
-#define HAVE_STACKTRACE
-extern void set_exception_pointers(EXCEPTION_POINTERS *ep);
-#define init_stacktrace() {}
-#endif
-
-#ifdef HAVE_STACKTRACE
-void print_stacktrace(uchar* stack_bottom, ulong thread_stack);
-void safe_print_str(const char* name, const char* val, int max_len);
-#else
-/* Define empty prototypes for functions that are not implemented */
-#define init_stacktrace() {}
-#define print_stacktrace(A,B) {}
-#define safe_print_str(A,B,C) {}
-#endif /* HAVE_STACKTRACE */
-
-
-#if !defined(__NETWARE__)
-#define HAVE_WRITE_CORE
-#endif
-
-#ifdef HAVE_WRITE_CORE
-void write_core(int sig);
-#endif
-
-
-#ifdef	__cplusplus
-}
-#endif