Fix bug#46980

    Option "--without-server" still not working in 5.1

The general approach is to make sure that source files
which require thread support are only compiled if the build
really needs thread support,
which means when the server is built or a thread-safe client
library.

This required several changes:
- Make sure the subdirectories "storage/" and "plugin/" are
  only processed if the server is built, not ifclient-only.
- Make the compilation of some modules which inherently
  require threading depend on thread supportin the build.
- Separate the handling of threading in "configure.in" from
  that of server issues, threading is also needed in a
  non-server build of a thread-safe client library.

Also, "libdbug" must get built even in a client-only build,
so "dbug/" must be in the list of client directories.

In addition, calls to thread functions in source files which
can be built without thread support must use the wrapper
functions which handle the non-threaded build.
So the modules "client/mysqlimport.c" and "client/mysqlslap.c"
must call "my_thread_end()" only via "mysql_thread_end()".


Makefile.am:
  The directories "storage/" and "plugin/" contain files
  which are needed for the server only, so their contents
  is to be built only if a server is built.
  
  They must not be named unconditionally, because building
  their contents will fail unless threads are enabled.
  
  These directories are now listed in the "configure"
  variable "sql_server_dirs" which becomes part of
  "sql_union_dirs" if the server is to be built.
client/mysqlimport.c:
  Use the wrapper function "mysql_thread_end()" which
  correctly handles the case of a non-threaded build.
client/mysqlslap.c:
  Use the wrapper function "mysql_thread_end()" which
  correctly handles the case of a non-threaded build.
configure.in:
  Various changes to support builds "--without-server":
  
  1) For the unit tests, we need "libdbug".
  
  2) Separate the treatment of the server from that of the
     thread-safe client library.
  
  3) Introduce an "automake conditional" "NEED_THREAD"
     which can be checked in some "Makefile.am".
  
  4) Include "storage/" and "plugin/" in the list of
     "sql_server_dirs" so that they are handled in the
     top "Makefile.am" only if the server is to be built
     (see the change in that file).
mysys/Makefile.am:
  The code of "mf_keycache.c" in 5.1 is no longer safe
  to be built without thread support.
  (In 5.0, this was possible.)
  
  Rather than fix these issues, which is tedious and risky,
  avoid the need to ever build it without thread support:
  It is needed in the server only, which needs thread support.
  
  The only case where we build a "libmysys" without thread
  support is for a non-threaded client, where "mf_keycache"
  is not neded.
  So its inclusion in the list of source files can depend
  on the new conditional "NEED_THREAD".
unittest/mysys/Makefile.am:
  Test program "my_atomic-t" is to verify the correct handling
  of threads only, it cannot be built without thread support
  and is not needed in such cases either.
  
  Let its build depend on the new conditional "NEED_THREAD".

Makefile.am

-# Copyright 2000-2008 MySQL AB, 2008 Sun Microsystems, Inc.
+# Copyright 2000-2008 MySQL AB, 2009 Sun Microsystems, Inc.
 # 
 # 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
@@ -24,7 +24,7 @@ EXTRA_DIST =		INSTALL-SOURCE INSTALL-WIN-SOURCE \
 SUBDIRS =		. include @docs_dirs@ @zlib_dir@ \
 			@readline_topdir@ sql-common scripts \
 			@pstack_dir@ \
-			@sql_union_dirs@ unittest storage plugin \
+			@sql_union_dirs@ unittest \
 			@sql_server@ @man_dirs@ tests \
 			netware @libmysqld_dirs@ \
 			mysql-test support-files sql-bench @tools_dirs@ \

client/mysqlimport.c

-/* Copyright (C) 2000-2006 MySQL AB
+/* Copyright (C) 2000-2006 MySQL AB, 2009 Sun Microsystems, Inc.
 
    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
@@ -583,7 +583,7 @@ pthread_handler_t worker_thread(void *arg)
   counter--;
   pthread_cond_signal(&count_threshhold);
   pthread_mutex_unlock(&counter_mutex);
-  my_thread_end();
+  mysql_thread_end();
 
   return 0;
 }

client/mysqlslap.c

-/* Copyright (C) 2005 MySQL AB
+/* Copyright (C) 2005 MySQL AB, 2009 Sun Microsystems, Inc.
 
    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
@@ -1918,7 +1918,7 @@ pthread_handler_t run_task(void *p)
   if (!opt_only_print) 
     mysql_close(mysql);
 
-  my_thread_end();
+  mysql_thread_end();
 
   pthread_mutex_lock(&counter_mutex);
   thread_counter--;

configure.in

@@ -2751,7 +2751,7 @@ server_scripts=
 
 dnl This probably should be cleaned up more - for now the threaded
 dnl client is just using plain-old libs.
-sql_client_dirs="strings regex mysys libmysql"
+sql_client_dirs="strings regex mysys dbug libmysql"
 
 AM_CONDITIONAL(THREAD_SAFE_CLIENT, test "$THREAD_SAFE_CLIENT" != "no")
 
@@ -2779,15 +2779,20 @@ fi
 AC_SUBST(netware_dir)
 AM_CONDITIONAL(HAVE_NETWARE, test "$netware_dir" = "netware")
 
-if test "$with_server" = "yes" -o "$THREAD_SAFE_CLIENT" != "no"
+if test "$with_server" != "no" -o "$THREAD_SAFE_CLIENT" != "no"
 then
   AC_DEFINE([THREAD], [1],
             [Define if you want to have threaded code. This may be undef on client code])
   # Avoid _PROGRAMS names
   THREAD_LOBJECTS="thr_alarm.o thr_lock.o thr_mutex.o thr_rwlock.o my_pthread.o my_thr_init.o mf_keycache.o"
   AC_SUBST(THREAD_LOBJECTS)
+fi
+AM_CONDITIONAL(NEED_THREAD, test "$with_server" != "no" -o "$THREAD_SAFE_CLIENT" != "no")
+
+if test "$with_server" != "no"
+then
   server_scripts="mysqld_safe mysql_install_db"
-  sql_server_dirs="strings mysys dbug extra regex"
+  sql_server_dirs="strings mysys dbug extra regex storage plugin"
 
   sql_server="vio sql"
 fi

mysys/Makefile.am

-# Copyright (C) 2000-2006 MySQL AB
+# Copyright (C) 2000-2006 MySQL AB, 2009 Sun Microsystems, Inc.
 # 
 # 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
@@ -25,7 +25,7 @@ libmysys_a_SOURCES =    my_init.c my_getwd.c mf_getdate.c my_mmap.c \
 			mf_path.c mf_loadpath.c my_file.c \
 			my_open.c my_create.c my_dup.c my_seek.c my_read.c \
 			my_pread.c my_write.c my_getpagesize.c \
-			mf_keycache.c mf_keycaches.c my_crc32.c \
+			mf_keycaches.c my_crc32.c \
 			mf_iocache.c mf_iocache2.c mf_cache.c mf_tempfile.c \
 			mf_tempdir.c my_lock.c mf_brkhant.c my_alarm.c \
 			my_malloc.c my_realloc.c my_once.c mulalloc.c \
@@ -53,6 +53,14 @@ libmysys_a_SOURCES =    my_init.c my_getwd.c mf_getdate.c my_mmap.c \
 			my_handler.c my_netware.c my_largepage.c \
 			my_memmem.c stacktrace.c \
 			my_windac.c my_access.c base64.c my_libwrap.c
+
+if NEED_THREAD
+# mf_keycache is used only in the server, so it is safe to leave the file
+# out of the non-threaded library.
+# In fact, it will currently not compile without thread support.
+libmysys_a_SOURCES +=   mf_keycache.c
+endif
+
 EXTRA_DIST =		thr_alarm.c thr_lock.c my_pthread.c my_thr_init.c \
 			thr_mutex.c thr_rwlock.c \
 			CMakeLists.txt mf_soundex.c \

unittest/mysys/Makefile.am

-# Copyright (C) 2006 MySQL AB
+# Copyright (C) 2009 Sun Microsystems, Inc.
 #
 # 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
@@ -21,7 +21,14 @@ LDADD 		= $(top_builddir)/unittest/mytap/libmytap.a \
 		  $(top_builddir)/dbug/libdbug.a \
 		  $(top_builddir)/strings/libmystrings.a
 
-noinst_PROGRAMS  = bitmap-t base64-t my_atomic-t
+noinst_PROGRAMS  = bitmap-t base64-t
+
+if NEED_THREAD
+# my_atomic-t is used to check thread functions, so it is safe to 
+# ignore the file in non-threaded builds.
+# In fact, it will not compile without thread support.
+noinst_PROGRAMS += my_atomic-t
+endif
 
 # Don't update the files from bitkeeper
 %::SCCS/s.%