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  <head>
    <title>ACE+TAO Subsetting</title>
    <link rev=made href="mailto:ace-users@cs.wustl.edu">
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<hr><p>
<H3>ACE+TAO Subsetting</H3>

We are involved in ongoing activities to subset ACE+TAO to make them
more flexible and to reduce their memory footprint for embedded
systems.  This document describes what we've done thus far, what we're
planning to do next, and how to leverage our efforts to minimize the
size of your ACE+TAO applications. <P>

<HR><P>
<font size=+2><strong>Contents</strong></font>
<ol>
  <li><a href="#Motivation">Motivation for Splitting ACE into Multiple
    Libraries</a>
  <li><a href="#Configuration Management">Configuration Management</a>
  <li><a href="#Classes">Classes in Each ACE Library Subset</a>
  <li><a href="#ACE Library Size Breakdown">ACE Library Size Breakdown</a>
  <li><a href="#Building ACE Subsets">Building ACE Subsets</a>
  <li><a href="#ACE_OS Adaptation Layer">ACE_OS Adaptation Layer</a>
  <li><a href="#minimumTAO">Minimum TAO</a>
  <li><a href="../apps/soreduce/README">The Shared Library Reduction (<CODE>soreduce</CODE>) tool</a>
  <li><a href="#Status">ACE+TAO Subsetting Work in Progress</a>
</ol><p>


<hr><p>
<h3><a name="Motivation">Motivation for Splitting ACE into Multiple
  Libraries</a></h3>

This document describes how we are splitting ACE into multiple
libraries, each of which will contain a smaller subset of the overall
ACE functionality.  The primary motivations for subsetting ACE are:

<UL>
<LI><EM>Principle of parsimony</EM> -- <EM>i.e.</EM>, developers
  should incur time/space overhead for components they use, rather
  than for all the components in the ACE framework. <P>

<LI><EM>Simplify the learning curve</EM> -- <EM>i.e.</EM>, developers
  only need to learn how to program components that they actually
  use. <P>
</UL>

The main design goals of our approach are as follows: <P>

<OL>
<LI>Support the original libACE as before.  Thus, for users who
want to use the existing ACE library as is, there will be
no changes, i.e., just link with <CODE>libACE</CODE> as usual. <P>

<LI>Allow ACE (and TAO) programmers to use smaller subsets of the
entire <CODE>libACE</CODE> library.  These subsets will include the
following libraries: <P>

<DL>
<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_OS</CODE> -- This library contains the OS adaptation
layer and its supporting classes.  All other ACE libraries will depend
on <CODE>libACE_OS</CODE> and it will depend on <EM>no</EM> other ACE
libraries. <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Utils</CODE> -- This library contains the various ACE
container classes and other miscellaneous classes, such as Singleton,
auto_ptr, timers, etc.  This library will depend only on
<CODE>libACE_OS</CODE>.<P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Logging</CODE> -- This library contains the various ACE
logging and tracing classes.  This library will depend only on
<CODE>libACE_OS</CODE>. <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Threads</CODE> -- This library contains the ACE
thread/process management and synchronization classes.  This library
will depend only on <CODE>libACE_OS</CODE>. <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Demux</CODE> -- This library contains the ACE Reactor and
Proactor classes.  This library will depend on <CODE>libACE_OS</CODE>
and <CODE>libACE_Thread</CODE>. <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Connection</CODE> -- This library contains the ACE
Connection components, i.e., Acceptor, Connector, and Svc_Handler.
This library will depend on <CODE>libACE_OS</CODE>,
<CODE>libACE_Thread</CODE>, and <CODE>libACE_Demux</CODE>.  <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Sockets</CODE> -- This library contains the ACE C++
wrappers for sockets.  This library will depend on
<CODE>libACE_OS</CODE>. <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_IPC</CODE> -- This library contains all the ACE C++
wrappers for the other types of IPC and FILE I/O other than sockets.
This library will depend on <CODE>libACE_OS</CODE> and
<CODE>libACE_Sockets</CODE>.  <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Timer</CODE> -- This library contains the ACE C++
wrappers for timer support.  This library will depend on
<CODE>libACE_OS</CODE>. <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Svcconf</CODE> -- This library contains the ACE C++
wrappers for the Service Configurator.  This library will depend on
<CODE>libACE_OS</CODE>, <CODE>libACE_Demux</CODE>,
<CODE>libACE_Thread</CODE>, and <CODE>libACE_Sockets</CODE>.  <P>

<DT> <img alt="o" src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Streams</CODE> -- This library contains the ACE Streams
classes.  This library will depend on <CODE>libACE_OS</CODE>,
<CODE>libACE_Demux</CODE>, and <CODE>libACE_Thread</CODE>.  <P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Memory</CODE> -- This library contains the ACE C++
wrappers for shared memory and memory-mapped files.  This library will
depend on <CODE>libACE_OS</CODE>.<P>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Token</CODE> -- This library contains the ACE C++
wrappers for token support.  This library is not needed by
<a href="http://www.cs.wustl.edu/~schmidt/TAO.html">TAO</a>.<p>

<DT> <img alt="o"
src="http://www.cs.wustl.edu/~schmidt/gifs/misc/redball.gif">
<CODE>libACE_Other</CODE> -- This library contains miscellaneous code,
primarily including a CORBA interface and naming support.  It is not
actively supported, and is not needed by <a
href="http://www.cs.wustl.edu/~schmidt/TAO.html">TAO</a>.  Its
functionality is included in TAO.<P>

</DL>
</OL>

We are also planning to support the OMG's <A
HREF="http://www.omg.org/cgi-bin/doc?orbos/98-08-04.pdf">Minimum
CORBA</A> specification as part of a separate effort.  Preliminary
results of prototypes for Minimum CORBA we've integrate to TAO have
been very promising, yielding a 40% reduction in ORB footprint. <P>

Note that the ACE library subsets described above are intended as a
guideline, <EM>not</EM> a complete specification.  The actual
partitioning of files in the final ACE library subsets may differ
somewhat to improve footprint and simplify common use-cases. <P>

<hr><p>
<h3><a name="Configuration Management">Configuration Management</a></h3>

Configuration management for the ACE library subsets described above
will be organized as follows:

<OL>
<LI>A single source tree with a single "version" for the source
    tree.<P>

<LI>Releases of libACE and its "subsets" will be atomic, <EM>i.e.</EM>,
    all or nothing.<P>
</OL>


<hr><p>
<h3><a name="Classes">Classes in Each ACE Library Subset</a></h3>

Below, we describe the classes in each ACE library subset.

<H4>libACE_OS</H4>

This library contains the OS adaptation layer and its supporting
classes.  The classes in this library should not depend on any other
ACE library subsets.  All of the other libraries will depend on this
library.  The following classes are included in this library.

<PRE><CODE>
  ARGV 
  Argv_Type_Converter 
  Basic_Types 
  Time_Value 
  OS 
  OS_Dirent 
  OS_Memory 
  OS_QoS 
  OS_String 
  OS_TLI 
  OS_Errno 
  Base_Thread_Adapter 
  OS_Thread_Adapter 
  OS_Log_Msg_Attributes 
  Thread_Hook 
  Sched_Params 
  Handle_Set 
  Copy_Disabled
</code></pre>

<H4>libACE_Utils</H4>

This library contains the following ACE container classes and other
miscellaneous classes.

<PRE><CODE>
  ACE 
  Active_Map_Manager 
  Arg_Shifter 
  Capabilities 
  Containers 
  Configuration 
  Configuration_Import_Export 
  Dirent 
  Dirent_Selector 
  Dynamic 
  Flag_Manip 
  Framework_Component 
  Functor 
  Get_Opt 
  Hash_Map_Manager 
  Connection_Recycling_Strategy 
  Hashable 
  Notification_Strategy 
  Recyclable 
  Refcountable 
  Handle_Ops 
  Init_ACE 
  Lib_Find 
  Message_Block 
  Method_Request 
  Object_Manager 
  Registry 
  String_Base_Const 
  SString 
  Stats 
  Sample_History
</code></pre>

<H4>libACE_Logging</H4>

This library contains the various ACE logging and tracing classes.

<PRE><CODE>
  Dump 
  Log_Msg 
  Log_Msg_Callback 
  Log_Msg_Backend 
  Log_Msg_IPC 
  Log_Msg_NT_Event_Log 
  Log_Msg_UNIX_Syslog 
  Log_Record 
  Logging_Strategy 
  Trace
</code></pre>

<H4>libACE_Threads</H4>

This library contains the ACE thread/process management and
synchronization classes.

<PRE><CODE>
  Activation_Queue 
  Process 
  Process_Manager 
  Synch 
  Synch_Options 
  Process_Semaphore 
  Process_Mutex 
  RW_Process_Mutex 
  File_Lock 
  Thread 
  Thread_Manager 
  Thread_Adapter 
  Thread_Exit 
  Thread_Control 
  Token
</code></pre>

<H4>libACE_Demux</H4>

This library contains the ACE Reactor and its associated classes,
including the ACE Connection components.

<PRE><CODE>
  Event_Handler 
  FlReactor 
  Msg_WFMO_Reactor 
  POSIX_Proactor 
  POSIX_CB_Proactor 
  WIN32_Proactor 
  Priority_Reactor 
  Proactor 
  Reactor 
  Select_Reactor 
  Select_Reactor_Base 
  SUN_Proactor 
  Dev_Poll_Reactor 
  TP_Reactor 
  TkReactor 
  WFMO_Reactor 
  XtReactor 
  QtReactor
</code></pre>

<H4>libACE_Connection</H4>

This library contains the ACE Connection components, i.e., Acceptor,
Connector, and Svc_Handler.

<PRE><CODE>
  Asynch_IO 
  Asynch_IO_Impl 
  Asynch_Pseudo_Task 
  POSIX_Asynch_IO 
  WIN32_Asynch_IO
</code></pre>

<H4>libACE_Sockets</H4>

This library contains the ACE C++ wrappers for sockets.

<PRE><CODE>
  Addr 
  INET_Addr 
  IPC_SAP 
  LSOCK 
  LSOCK_Acceptor 
  LSOCK_CODgram 
  LSOCK_Connector 
  LSOCK_Dgram 
  LSOCK_Stream 
  SOCK 
  SOCK_Acceptor 
  SOCK_CODgram 
  Sock_Connect 
  SOCK_Connector 
  SOCK_Dgram 
  SOCK_Dgram_Bcast 
  SOCK_Dgram_Mcast 
  SOCK_IO 
  SOCK_Stream
</code></pre>

<H4>libACE_IPC</H4>

This library contains all the ACE C++ wrappers for the other types of
IPC and FILE I/O other than sockets.  This library will depend on the
<CODE>libACE_Socket</CODE> library.

<PRE><CODE>
  ATM_Addr 
  ATM_Acceptor 
  ATM_Connector 
  ATM_Params 
  ATM_QoS 
  ATM_Stream 
  XTI_ATM_Mcast 
  DEV 
  DEV_Addr 
  DEV_Connector 
  DEV_IO 
  FIFO 
  FIFO_Recv 
  FIFO_Recv_Msg 
  FIFO_Send 
  FIFO_Send_Msg 
  FILE_Addr 
  FILE 
  FILE_Connector 
  FILE_IO 
  IO_SAP 
  IOStream 
  Pipe 
  Signal 
  SPIPE_Addr 
  SPIPE 
  SPIPE_Acceptor 
  SPIPE_Connector 
  SPIPE_Stream 
  SV_Message 
  SV_Message_Queue 
  SV_Semaphore_Complex 
  SV_Semaphore_Simple 
  SV_Shared_Memory 
  TLI 
  TLI_Acceptor 
  TLI_Connector 
  TLI_Stream 
  TTY_IO 
  UNIX_Addr 
  UPIPE_Acceptor 
  UPIPE_Connector 
  UPIPE_Stream 
  MEM_Acceptor 
  MEM_Addr 
  MEM_Connector 
  MEM_IO 
  MEM_SAP 
  MEM_Stream
</code></pre>

<H4>libACE_Svcconf</H4>

This library contains the ACE C++ wrappers for the Service
Configurator component.

<PRE><CODE>
  DLL 
  DLL_Manager 
  Dynamic_Service_Base 
  Parse_Node 
  Service_Config 
  Service_Manager 
  Service_Object 
  Service_Repository 
  Service_Types 
  Service_Templates 
  Shared_Object 
  XML_Svc_Conf 
  Svc_Conf_l 
  Svc_Conf_y 
  Svc_Conf_Lexer_Guard
</code></pre>

<H4>libACE_Streams</H4>

This library contains the ACE Streams classes.

<PRE><CODE>
  CDR_Base 
  CDR_Stream 
  Codeset_IBM1047 
  Message_Queue 
  Reactor_Notification_Strategy 
  Task
</code></pre>

<H4>libACE_Memory</H4>

This library contains the ACE C++ wrappers for shared memory and
memory-mapped files.

<PRE><CODE>
  Based_Pointer_Repository 
  Malloc 
  PI_Malloc 
  Malloc_Allocator 
  Malloc_Instantiations 
  Mem_Map 
  Memory_Pool 
  Obchunk 
  Obstack 
  Read_Buffer 
  Shared_Memory 
  Shared_Memory_MM 
  Shared_Memory_SV
</code></pre>

<H4>libACE_Timer</H4>

This componenty contains the ACE C++ wrappers for the ACE timer classes.

<pre><code>
  Basic_Stats 
  High_Res_Timer 
  Profile_Timer 
  System_Time 
  Time_Request_Reply 
  Timeprobe 
  Timer_Hash 
  Timer_Heap 
  Timer_List 
  Timer_Queue 
  Timer_Wheel
</code></pre>

<H4>libACE_Token</H4>

This componenty contains the ACE C++ wrappers for Token classes.

<pre><code>
  Local_Tokens 
  Remote_Tokens 
  Token_Collection 
  Token_Invariants 
  Token_Manager 
  Token_Request_Reply
</code></pre>

<H4>libACE_Codec</H4>

This component contains the ACE codec support:

<pre><code>
  Codecs
</code></pre>

<H4>libACE_Other</H4>

This component contains miscellaneous ACE C++ wrappers:

<pre><code>
  Local_Name_Space 
  Name_Proxy 
  Name_Request_Reply 
  Name_Space 
  Naming_Context 
  Registry_Name_Space 
  Remote_Name_Space 
</code></pre>

<hr><p>
<h3><a name="ACE Library Size Breakdown">ACE Library Size Breakdown</a></h3>

Here is an example size breakdown, by ACE library component.  It is
for the ACE 5.0 libACE.a, statically built with these <a
href="../ACE-INSTALL.html#flags">make
flags</a>:
<pre><code>
    debug=0 optimize=1 static_libs_only=1 DEFFLAGS=-DACE_USE_RCSID=0
</code></pre><p>

These options translate into:<P>

(a) No debugging,<BR>
(b) Optimization is set to -O2,<BR>
(c) Static ACE and TAO libraries, and<BR>
(d) Use of RCS Ids is turned off. <P>

To build an ACE static library, if shared libraries are the default, use
<code>make static_libs_only=1</code>.  If you're using recent versions
of GNU GCC, you can use the <A
  HREF="../ACE-INSTALL.html#repo">-frepo</A>
option, which typically reduces the footprint by another 25 percent. <P>

<center><table cellpadding=4 border=4>
  <tr>
    <th>Platform
    <th>Component
    <th>Total
    <th>For TAO<br>subset
    <th>OS
    <th>Utils
    <th>Logging
    <th>Threads
    <th>Demux
    <th>Con-<br>nection
    <th>Sockets
    <th>IPC
    <th>Svcconf
    <th>Streams
    <th>Memory
    <th>Token
    <th>Other
  <tr>
    <th rowspan=2>Linux (RedHat 6.0/Intel)<br>egcs 2.91.66
    <th>Size, bytes
    <td align=center>648727
    <td align=center>515501
    <td align=center>10937
    <td align=center>118305
    <td align=center>13544
    <td align=center>59593
    <td align=center>74629
    <td align=center>49933
    <td align=center>16084
    <td align=center>34820
    <td align=center>92192
    <td align=center>18462
    <td align=center>27002
    <td align=center>71574
    <td align=center>61652
  <tr>
    <th>Percentage of<br>total size
    <td align=center>100
    <td align=center>79.46
    <td align=center>1.69
    <td align=center>18.24
    <td align=center>2.09
    <td align=center>9.19
    <td align=center>11.50
    <td align=center>7.70
    <td align=center>2.48
    <td align=center>5.37
    <td align=center>14.21
    <td align=center>2.85
    <td align=center>4.16
    <td align=center>11.03
    <td align=center>9.50

  <tr>
    <th rowspan=2>LynxOS 3.0.0<br>g++ 2.7-97r1
    <th>Size, bytes
    <td align=center>582672
    <td align=center>475216
    <td align=center>25620
    <td align=center>97220
    <td align=center>11000
    <td align=center>44192
    <td align=center>71388
    <td align=center>58100
    <td align=center>13120
    <td align=center>31572
    <td align=center>77972
    <td align=center>21468
    <td align=center>23564
    <td align=center>60832
    <td align=center>46624
  <tr>
    <th>Percentage of<br>total size
    <td align=center>100
    <td align=center>81.56
    <td align=center>4.40
    <td align=center>16.69
    <td align=center>1.89
    <td align=center>7.58
    <td align=center>12.25
    <td align=center>9.97
    <td align=center>2.25
    <td align=center>5.42
    <td align=center>13.38
    <td align=center>3.68
    <td align=center>4.04
    <td align=center>10.44
    <td align=center>8.00

  <tr>
    <th rowspan=2>SunOS5.7<br>egcs 2.91.60
    <th>Size, bytes
    <td align=center>709543
    <td align=center>570693
    <td align=center>11877
    <td align=center>115306
    <td align=center>13721
    <td align=center>63027
    <td align=center>87962
    <td align=center>68551
    <td align=center>16917
    <td align=center>42954
    <td align=center>99839
    <td align=center>21357
    <td align=center>29182
    <td align=center>75970
    <td align=center>62880
  <tr>
    <th>Percentage of<br>total size
    <td align=center>100
    <td align=center>80.43
    <td align=center>1.67
    <td align=center>16.25
    <td align=center>1.93
    <td align=center>8.88
    <td align=center>12.40
    <td align=center>9.66
    <td align=center>2.38
    <td align=center>6.05
    <td align=center>14.07
    <td align=center>3.01
    <td align=center>4.11
    <td align=center>10.71
    <td align=center>8.86

  <tr>
    <th rowspan=2>SunOS 5.7<br>GreenHills 1.8.9
    <th>Size, bytes
    <td align=center>803651
    <td align=center>653787
    <td align=center>15800
    <td align=center>146633
    <td align=center>18544
    <td align=center>69172
    <td align=center>103584
    <td align=center>60580
    <td align=center>23084
    <td align=center>52986
    <td align=center>108200
    <td align=center>21528
    <td align=center>33676
    <td align=center>79324
    <td align=center>70540
  <tr>
    <th>Percentage of<br>total size
    <td align=center>100
    <td align=center>81.35
    <td align=center>1.97
    <td align=center>18.25
    <td align=center>2.31
    <td align=center>8.61
    <td align=center>12.89
    <td align=center>7.54
    <td align=center>2.87
    <td align=center>6.59
    <td align=center>13.46
    <td align=center>2.68
    <td align=center>4.19
    <td align=center>9.87
    <td align=center>8.78

  <tr>
    <th rowspan=2>SunOS 5.7<br>Sun C++ 4.2
    <th>Size, bytes
    <td align=center>626824
    <td align=center>494501
    <td align=center>15502
    <td align=center>64929
    <td align=center>15605
    <td align=center>63364
    <td align=center>106841
    <td align=center>55013
    <td align=center>19945
    <td align=center>73584
    <td align=center>46434
    <td align=center>19685
    <td align=center>25952
    <td align=center>69843
    <td align=center>62480
  <tr>
    <th>Percentage of<br>total size
    <td align=center>100
    <td align=center>78.89
    <td align=center>2.47
    <td align=center>10.36
    <td align=center>2.49
    <td align=center>10.11
    <td align=center>17.04
    <td align=center>8.78
    <td align=center>3.18
    <td align=center>11.74
    <td align=center>7.41
    <td align=center>3.14
    <td align=center>4.14
    <td align=center>11.14
    <td align=center>9.97

  <tr>
    <th rowspan=2>VxWorks 5.3.1<br>GreenHills 1.8.8
    <th>Size, bytes
    <td align=center>689564
    <td align=center>542628
    <td align=center>22252
    <td align=center>145036
    <td align=center>19664
    <td align=center>63640
    <td align=center>54296
    <td align=center>980
    <td align=center>22120
    <td align=center>47468
    <td align=center>117932
    <td align=center>23220
    <td align=center>27220
    <td align=center>78900
    <td align=center>68036
  <tr>
    <th>Percentage of<br>total size
    <td align=center>100
    <td align=center>78.69
    <td align=center>3.23
    <td align=center>21.03
    <td align=center>2.85
    <td align=center>9.23
    <td align=center>7.87
    <td align=center>0.14
    <td align=center>3.21
    <td align=center>6.88
    <td align=center>17.10
    <td align=center>3.37
    <td align=center>3.95
    <td align=center>11.44
    <td align=center>9.87

  <tr>
    <th rowspan=2>VxWorks 5.3.1<br>g++ cygnus-<br>2.7.2-960126<br>
      (with implicit templates)
    <th>Size, bytes
    <td align=center>1051540
    <td align=center>888244
    <td align=center>36484
    <td align=center>140832
    <td align=center>14344
    <td align=center>66740
    <td align=center>266192
    <td align=center>14480
    <td align=center>15084
    <td align=center>106308
    <td align=center>142500
    <td align=center>55932
    <td align=center>29348
    <td align=center>88564
    <td align=center>74732
  <tr>
    <th>Percentage of<br>total size
    <td align=center>100
    <td align=center>84.47
    <td align=center>3.47
    <td align=center>13.39
    <td align=center>1.36
    <td align=center>6.35
    <td align=center>25.31
    <td align=center>1.38
    <td align=center>1.43
    <td align=center>10.11
    <td align=center>13.55
    <td align=center>5.32
    <td align=center>2.79
    <td align=center>8.42
    <td align=center>7.11
</table></center><p>

<blockquote>It has also been observed recently that using -xO3 
with -xspace on SUN CC 5.3 compiler gives a big footprint reduction of
the order of 40% </blockquote>

<hr><p>
<h3><a name="Building ACE Subsets">Building ACE Subsets</a></h3>

By default, the ACE library contains all of the components that ACE
currently supports.  To reduce build time and library size, you can
exclude unused components.  To do that, define an
<code>ACE_COMPONENTS</code> variable using this approach:<p>

<ol>
  <li>In your <code>$(ACE_ROOT)/include/makeinclude/platform_macros.GNU</code>
    file, <em>e.g.</em>, add:
    <pre><code>ACE_COMPONENTS = OS</code></pre>or<p>

  <li>On the make command line, <em>e.g.</em>,
    <pre><code>make ACE_COMPONENTS=OS</code></pre>or<p>

  <li>Set (and export) the <code>ACE_COMPONENTS</code> environment variable
    to contain the components that you want to build.<p>
</ol>

Please see <code><a href="../ace/Makefile">../ace/Makefile</a></code>
for the default contents of <code>ACE_COMPONENTS</code>.<p>

A special value of <code>ACE_COMPONENTS</code> can be used to
build an ACE library that supports
<a href="http://www.cs.wustl.edu/~schmidt/TAO.html">TAO</a>.  The
special value is <code>FOR_TAO</code>.  So, for example, you can
add this to your
<code>$(ACE_ROOT)/include/makeinclude/platform_macros.GNU</code>
to restrict ACE support to just that which is needed for TAO:
<pre><code>
ACE_COMPONENTS = FOR_TAO
</code></pre><p>

Please note the current limitations:<p>

<ol>
  <li>We currently don't check for interdependencies between components.
    For example, if you build any component beside <code>OS</code>, you
    must explicitly include <code>OS</code> in your
    <code>ACE_COMPONENTS</code>.<br><br></li>

  <li>We currently don't check this macro in other ACE or TAO Makefiles, or
    in their tests. We'll add those checks as time allows.<br><br></li>

  <li>This is only supported by the gmake Makefiles.  For example, the MSVC
      projects on Win32 do not support the specification of components.<br><br></li>
</ol>

<hr><p>
<h3><a name="ACE_OS Adaptation Layer">ACE_OS Adaptation Layer</a></h3>

The lowest-level component, <code>OS</code>, is also called the
<em>ACE_OS adaption layer</em>.  It provides the ACE interface to
the underlying operating system, but little else.  It can be used
standalone.<p>

To create the ACE_OS adaptation layer, build your <code>libACE</code>
with <code>ACE_COMPONENTS</code> set to <code>OS</code>.  In addition,
add <code>#include "ace/config-minimal.h"</code> to your
<code>ACE_wrappers/ace/config.h</code> file.<p>

When using the ACE_OS adaptation layer, you'll be limited to the
the <code>ACE_OS</code> member functions, ACE's
<a href="../ace/Basic_Types.h">Basic_Types</a> and
<a href="../ace/Sched_Params.h">Sched_Params</a>, and macros defined in
<a href="../ace/OS.h"><code>ace/OS.h</code></a>.  See ACE's
<a href="../tests/Basic_Types_Test.cpp">Basic_Types_Test.cpp</a>
for an example of usage.<p>

<a name="minimumTAO"><!--#include virtual="minimumTAO.html" --></a>

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