dylan-lang · housel · Jun 27, 2026 · Jun 26, 2026 · Jun 26, 2026 · Jun 26, 2026
diff --git a/documentation/source/getting-started-ide/projects.rst b/documentation/source/getting-started-ide/projects.rst
@@ -685,10 +685,10 @@ of two modes: Interactive Development mode, and Production mode. See
 Link page
 ---------
 
-The **Project > Settings...** dialog's Link page controls whether a project
+The :menuselection:`Project --> Settings...` dialog's Link page controls whether a project
 is linked as an executable or as a DLL, and what its name will be. It
-also allows you to specify version information for the target, a base
-address for it, and the Windows subsystem it runs in.
+also allows you to specify version information for the target
+and the Windows subsystem it runs in.
 
 .. note:: The default linker used in Open Dylan is a GNU linker. If
    you own Microsoft Developer Studio, you can use the Microsoft linker
@@ -699,30 +699,16 @@ address for it, and the Windows subsystem it runs in.
 Target File section of the Link page
 ------------------------------------
 
-The **Project > Settings...** dialog's Link page has a Target File section
+The :menuselection:`Project --> Settings...` dialog's Link page has a Target File section
 that contains the name of the project target and the type of the target.
 The default target name is derived from the name of the project. Note
 that the name will always end in .EXE or .DLL according to the target
 type, regardless of any extension you give to the target's name.
 
-Base Address section of the Link page
--------------------------------------
-
-The **Project > Settings...** dialog's Link page has a Base Address section
-that allows you to specify a base address for your target file. This is
-the address at which the target will be loaded into memory.
-
-Windows 95, Windows 98, and Windows NT all provide a default base
-address, one for EXEs and one for DLLs, and will also relocate the
-target automatically if there is no room for it at that address. You can
-provide a value in the Base Address if you would like the target to be
-loaded at a particular location. The value should be specified in
-hexadecimal, using Dylan's *#x* prefix: for example, *#x1000000*.
-
 Version Information section of the Link page
 --------------------------------------------
 
-The **Project > Settings...** dialog's Link page has a Version Information
+The :menuselection:`Project --> Settings...` dialog's Link page has a Version Information
 section that allows you to add major and minor version numbers to a DLL
 or EXE. The values in this section are recorded in the DLL or EXE that
 the project builds. Open Dylan uses them at compile time and run

diff --git a/documentation/source/library-reference/lid.rst b/documentation/source/library-reference/lid.rst
@@ -415,26 +415,22 @@ LID keyword
 
     Base-Address: *address*
 
+.. deprecated:: 2026.2
+   Because Windows versions starting with Windows Vista and
+   Windows Server 2008 implement Address Space Layout Randomization for
+   improved security, providing an initial base address is no longer
+   useful.
+
 .. note:: This keyword is only used on Windows and is ignored on other
    platforms.
 
-Specifies the base address of the DLL built from this Dylan library. The
-*address* must be a hexadecimal value. For convenience, you can use
-either Dylan (``#xNNNNNNNN``) or C (``0xNNNNNNNN``) notations when
-specifying the address.
+This keyword specifies the base address of the Windows DLL built from
+this Dylan library. If provided, *address* must be a hexadecimal value. For
+convenience, you can use either Dylan (``#xNNNNNNNN``) or C
+(``0xNNNNNNNN``) notations when specifying the address.
 
 This base address is ignored when building a ``.EXE`` file.
 
-If this keyword is not specified, the compiler will compute a default
-base address for the library. However, it is possible for more than one
-library to end up with the same default base address. If an application
-uses any of these libraries, all but one of them will have to be
-relocated when the application starts. This process is automatic, but
-cuts down on the amount of sharing, increases your application's memory
-footprint, and slows down load time. In such circumstances, you may want
-to give one or more libraries an explicit base address using this
-keyword.
-
 Linker-Options:
 ^^^^^^^^^^^^^^^
 

diff --git a/documentation/source/release-notes/2026.2.rst b/documentation/source/release-notes/2026.2.rst
@@ -30,6 +30,12 @@ Compiler
   ABIs, and which improves performance in certain situations (such as
   dispatching methods with keyword arguments).
 
+* The ``base-address`` keyword in LID and HDP project files,
+  specifying a default load address for DLLs on Windows, has been
+  obsoleted. The :guilabel:`Base address` project link option in the
+  IDE has been removed, and the compiler will no longer attempt to
+  assign a base address automatically when projects are saved.
+
 Tools
 =====
 

diff --git a/sources/app/dylan-playground/dylan-playground.lid b/sources/app/dylan-playground/dylan-playground.lid
@@ -1,7 +1,6 @@
 Library:   dylan-playground
 Author:    Andy Armstrong
 Synopsis:  A Dylan application to play around in
-Base-Address:	  0x64FE0000
 Major-Version:    2
 Minor-Version:	  1
 Compilation-Mode: loose

diff --git a/sources/app/dylan-playground/gui-dylan-playground.lid b/sources/app/dylan-playground/gui-dylan-playground.lid
@@ -1,7 +1,6 @@
 Library:   gui-dylan-playground
 Author:    Andy Armstrong
 Synopsis:  A Dylan application to play around in
-Base-Address:	  0x64FE0000
 Linker-Options:	  $(guilflags)
 Major-Version:    2
 Minor-Version:	  1

diff --git a/sources/app/plonker/plonker.lid b/sources/app/plonker/plonker.lid
@@ -6,7 +6,6 @@ files:	library
 	keyboard-pane
 	frame
 	plonker
-base-address:	0x64FA0000
 start-function:	main
 linker-options:	$(guilflags)
 major-version:	2

diff --git a/sources/collections/collections-win32.lid b/sources/collections/collections-win32.lid
@@ -2,7 +2,6 @@ Library:      collections
 Synopsis:     Collection extensions library
 Author:       Andy Armstrong
 Executable:   DxCOLLNS
-Base-Address: 0x66CA0000
 Library-Pack: Core
 RC-Files:     version.rc
 LID:          collections.lid

diff --git a/sources/common-dylan/win32-common-dylan.lid b/sources/common-dylan/win32-common-dylan.lid
@@ -3,7 +3,6 @@ Module:       dylan-user
 Synopsis:     Common Dylan library definition
 Author:       Andy Armstrong
 Executable:   DxCMNDYL
-Base-Address: 0x66DC0000
 RC-Files:     version.rc
 Target-Type:  dll
 Files: library

diff --git a/sources/corba/demos/bank/bank-client/bank-client.hdp b/sources/corba/demos/bank/bank-client/bank-client.hdp
@@ -5,7 +5,6 @@ files:	library
 	module
 	bank-client
 	init-client
-base-address:	0x64FE0000
 debug-arguments:	-ORBname-service-file c:\temp\ns.ior -location-service:shared-file
 start-function:	
 linker-options:	$(guilflags)

diff --git a/sources/corba/demos/bank/bank-server/bank-server.hdp b/sources/corba/demos/bank/bank-server/bank-server.hdp
@@ -6,7 +6,6 @@ files:	library
 	bank-server
 	server-frame
 	init-server
-base-address:	0x64DE0000
 debug-arguments:	-ORBname-service-file c:\temp\ns.ior -location-service:shared-file
 linker-options:	$(guilflags)
 major-version:	2

diff --git a/sources/corba/demos/chat/client/chat-client.hdp b/sources/corba/demos/chat/client/chat-client.hdp
@@ -1,7 +1,6 @@
 comment:	This file is generated, please don't edit
 format-version:	2
 target-type:	executable
-base-address:	0x63F80000
 linker-options:	$(guilflags)
 start-function:	main
 major-version:	2

diff --git a/sources/corba/demos/chat/server/chat-server.hdp b/sources/corba/demos/chat/server/chat-server.hdp
@@ -1,7 +1,6 @@
 comment:	This file is generated, please don't edit
 format-version:	2
 target-type:	executable
-base-address:	0x63F80000
 linker-options:	$(guilflags)
 start-function:	main
 major-version:	2

diff --git a/sources/corba/demos/corba-hello-world/client/corba-hello-world-client.hdp b/sources/corba/demos/corba-hello-world/client/corba-hello-world-client.hdp
@@ -4,7 +4,6 @@ library:	corba-hello-world-client
 files:	library
 	module
 	corba-hello-world-client
-base-address:	0x63AC0000
 start-function:	main
 major-version:	2
 minor-version:	1

diff --git a/sources/corba/demos/corba-hello-world/server/corba-hello-world-server.hdp b/sources/corba/demos/corba-hello-world/server/corba-hello-world-server.hdp
@@ -4,7 +4,6 @@ library:	corba-hello-world-server
 files:	library
 	module
 	corba-hello-world-server
-base-address:	0x63AA0000
 start-function:	main
 major-version:	2
 minor-version:	1

diff --git a/sources/corba/demos/pente/corba-pente.hdp b/sources/corba/demos/pente/corba-pente.hdp
@@ -5,7 +5,6 @@ files:	library
 	module
 	board
 	start
-base-address:	0x63FE0000
 start-function:	play-pente
 linker-options:	$(guilflags)
 major-version:	2

diff --git a/sources/corba/orb/connections/orb-connections.hdp b/sources/corba/orb/connections/orb-connections.hdp
@@ -1,7 +1,6 @@
 comment:	This file is generated, please don't edit
 format-version:	2
 Library-Pack:   CORBA
-base-address:	0x63EE0000
 minor-version:	1
 files:	orb-connections-library
 	manager

diff --git a/sources/corba/orb/core/orb-core.hdp b/sources/corba/orb/core/orb-core.hdp
@@ -2,7 +2,6 @@ comment:	This file is generated, please don't edit
 format-version:	2
 target-type:	dll
 Library-Pack:   CORBA
-base-address:	0x63F40000
 files:	orb-core-library
 	args
 	orb

diff --git a/sources/corba/orb/dylan/corba-dylan.hdp b/sources/corba/orb/dylan/corba-dylan.hdp
@@ -3,7 +3,6 @@ format-version:	2
 library:	corba-dylan
 files:	corba-dylan-library
 	corba-dylan
-base-address:	0x64FE0000
 Library-Pack:   CORBA
 major-version:	2
 minor-version:	1

diff --git a/sources/corba/orb/iiop/orb-iiop.hdp b/sources/corba/orb/iiop/orb-iiop.hdp
@@ -2,7 +2,6 @@ comment:	This file is generated, please don't edit
 format-version:	2
 target-type:	dll
 Library-Pack:   CORBA
-base-address:	0x63F40000
 files:	orb-iiop-library
 	cdr-basic
 	cdr-constructed

diff --git a/sources/corba/orb/orb/win32-orb.hdp b/sources/corba/orb/orb/win32-orb.hdp
@@ -3,7 +3,6 @@ format-version:	2
 target-type:	dll
 Library-Pack:   CORBA
 RC-Files:       version.rc
-base-address:	0x64EC0000
 files:	orb-library
 major-version:	2
 minor-version:	1

diff --git a/sources/corba/orb/poa/orb-poa.hdp b/sources/corba/orb/poa/orb-poa.hdp
@@ -2,7 +2,6 @@ comment:	This file is generated, please don't edit
 format-version:	2
 target-type:	dll
 Library-Pack:   CORBA
-base-address:	0x63EC0000
 files:	orb-poa-library
 	poa
 	receiver

diff --git a/sources/corba/orb/protocols/corba/corba-protocol.hdp b/sources/corba/orb/protocols/corba/corba-protocol.hdp
@@ -13,7 +13,6 @@ files:	corba-protocol-library
 	exceptions
 	conditions
 subprojects:	../../dylan/corba-dylan.hdp
-base-address:	0x63D80000
 Library-Pack:   CORBA
 debug-arguments:	-debug
 major-version: 2

diff --git a/sources/corba/orb/protocols/portableserver/portableserver-protocol.hdp b/sources/corba/orb/protocols/portableserver/portableserver-protocol.hdp
@@ -6,7 +6,6 @@ files:	portableserver-protocol-library
 subprojects:	../../dylan/corba-dylan.hdp
 	../corba/corba-protocol.hdp
 Library-Pack:   CORBA
-base-address:	0x63FC0000
 major-version: 2
 minor-version: 1
 compilation-mode:	tight

diff --git a/sources/corba/orb/streams/orb-streams.hdp b/sources/corba/orb/streams/orb-streams.hdp
@@ -9,7 +9,6 @@ files:	orb-streams-library
 subprojects:	../utilities/orb-utilities.hdp
 	../dylan/corba-dylan.hdp
 Library-Pack:   CORBA
-base-address:	0x63FC0000
 major-version: 2
 minor-version: 1
 compilation-mode:	tight

diff --git a/sources/corba/orb/utilities/orb-utilities.hdp b/sources/corba/orb/utilities/orb-utilities.hdp
@@ -8,7 +8,6 @@ files:	orb-utilities-library
 	tickets
 subprojects:	../dylan/corba-dylan.hdp
 Library-Pack:   CORBA
-base-address:	0x63FE0000
 major-version: 2
 minor-version: 1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/abstract-syntax-tree/scepter-ast.hdp b/sources/corba/scepter/abstract-syntax-tree/scepter-ast.hdp
@@ -33,7 +33,6 @@ files:	scepter-ast-library
 	root
 	error
 subprojects:	../core/scepter-core.hdp
-base-address:	0x63F40000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/back-end/dump/scepter-dump-back-end.hdp b/sources/corba/scepter/back-end/dump/scepter-dump-back-end.hdp
@@ -6,7 +6,6 @@ files:	library
 	dump
 subprojects:	../../core/scepter-core.hdp
 	../../abstract-syntax-tree/scepter-ast.hdp
-base-address:	0x63FE0000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/back-end/dylan/scepter-dylan-back-end.hdp b/sources/corba/scepter/back-end/dylan/scepter-dylan-back-end.hdp
@@ -23,7 +23,6 @@ files:	scepter-dylan-back-end-library
 	typedef
 subprojects:	../../core/scepter-core.hdp
 	../../abstract-syntax-tree/scepter-ast.hdp
-base-address:	0x63FE0000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/back-end/ir/scepter-ir-back-end.hdp b/sources/corba/scepter/back-end/ir/scepter-ir-back-end.hdp
@@ -17,7 +17,6 @@ files:	scepter-ir-back-end-library
 	operation
 subprojects:	../../core/scepter-core.hdp
 	../../abstract-syntax-tree/scepter-ast.hdp
-base-address:	0x63FE0000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/back-end/ir/tests/scepter-ir-back-end-test-suite.hdp b/sources/corba/scepter/back-end/ir/tests/scepter-ir-back-end-test-suite.hdp
@@ -6,7 +6,6 @@ files:	library
 	scepter-ir-back-end-test-suite
 subprojects:	../scepter-ir-back-end.hdp
 	../../../core/scepter-core.hdp
-base-address:	0x63FE0000
 debug-arguments:	-debug -progress
 start-function:	
 major-version:	2

diff --git a/sources/corba/scepter/console/console-scepter.hdp b/sources/corba/scepter/console/console-scepter.hdp
@@ -7,7 +7,6 @@ files:	console-scepter-library
 	main
 subprojects:	../scepter.hdp
 	../core/scepter-core.hdp
-base-address:	0x64F20000
 debug-arguments:	/debugger /language:dump /stdout c:/users/keithd/foo.idl
 start-function:	main
 major-version:	2

diff --git a/sources/corba/scepter/console/minimal-console-scepter.hdp b/sources/corba/scepter/console/minimal-console-scepter.hdp
@@ -7,7 +7,6 @@ files:	minimal-console-scepter-library
 	main
 subprojects:	../scepter.hdp
 	../core/scepter-core.hdp
-base-address:	0x64F20000
 start-function:	main
 major-version:	2
 minor-version:	1

diff --git a/sources/corba/scepter/core/scepter-core.hdp b/sources/corba/scepter/core/scepter-core.hdp
@@ -9,7 +9,6 @@ files:	scepter-core-library
 	back-end
 	error
 subprojects:	../utilities/scepter-utilities.hdp
-base-address:	0x63FE0000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/minimal-scepter.hdp b/sources/corba/scepter/minimal-scepter.hdp
@@ -7,7 +7,6 @@ subprojects:	front-end\file\scepter-file-front-end.hdp
 	back-end\dylan\scepter-dylan-back-end.hdp
 	back-end\dump\scepter-dump-back-end.hdp
 	core\scepter-core.hdp
-base-address:	0x63DE0000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/scepter.hdp b/sources/corba/scepter/scepter.hdp
@@ -7,7 +7,6 @@ subprojects:	front-end\file\scepter-file-front-end.hdp
 	back-end\dylan\scepter-dylan-back-end.hdp
 	back-end\dump\scepter-dump-back-end.hdp
 	core\scepter-core.hdp
-base-address:	0x63DE0000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/tests/console/console-scepter-tests.hdp b/sources/corba/scepter/tests/console/console-scepter-tests.hdp
@@ -4,7 +4,6 @@ library:	console-scepter-tests
 files:	console-scepter-tests-library
 	start
 subprojects:	../scepter-tests.hdp
-base-address:	0x64E80000
 major-version: 2
 minor-version: 1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/tests/scepter-tests.hdp b/sources/corba/scepter/tests/scepter-tests.hdp
@@ -69,7 +69,6 @@ files:	library
 	errors/damaged-suite
 	suites
 subprojects:	../scepter.hdp
-base-address:	0x64EA0000
 major-version: 2
 minor-version: 1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/tool/tool-scepter.hdp b/sources/corba/scepter/tool/tool-scepter.hdp
@@ -7,7 +7,6 @@ files:	tool-scepter-library
 subprojects:	../scepter.hdp
 	../abstract-syntax-tree/scepter-ast.hdp
 	../front-end/file/scepter-file-front-end.hdp
-base-address:	0x63CA0000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/scepter/utilities/scepter-utilities.hdp b/sources/corba/scepter/utilities/scepter-utilities.hdp
@@ -5,7 +5,6 @@ files:	scepter-utilities-library
 	scepter-utilities-module
 	indenting
 	misc
-base-address:	0x63E00000
 major-version:	2
 minor-version:	1
 compilation-mode:	tight

diff --git a/sources/corba/services/naming/client/win32-naming-client.lid b/sources/corba/services/naming/client/win32-naming-client.lid
@@ -1,7 +1,6 @@
 Library:      naming-client
 Author:       Gary Palter
 Executable:   DxCNSC
-Base-Address: 0x64E80000
 Library-Pack: CORBA
 RC-Files:     version.rc
 LID:          naming-client.lid