diff --git a/v2/tools/clang-darwin.jam b/v2/tools/clang-darwin.jam
new file mode 100644
index 000000000..8548718e4
--- /dev/null
+++ b/v2/tools/clang-darwin.jam
@@ -0,0 +1,536 @@
+# Copyright 2003 Christopher Currie
+# Copyright 2006 Dave Abrahams 
+# Copyright 2003, 2004, 2005, 2006 Vladimir Prus 
+# Copyright 2005-2007 Mat Marcus
+# Copyright 2005-2007 Adobe Systems Incorporated
+# Copyright 2007-2009 Rene Rivera
+# Distributed under the Boost Software License, Version 1.0. 
+# (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) 
+
+import feature : feature ;
+import toolset : flags ;
+import type ;
+import common ;
+import generators ;
+import path : basename ;
+import version ;
+import property-set ;
+import regex ;
+import errors ;
+
+## Use a framework.
+feature framework : : free ;
+
+## The MacOSX version to compile for, which maps to the SDK to use (sysroot).
+feature macosx-version : : propagated link-incompatible symmetric optional ;
+
+## The minimal MacOSX version to target.
+feature macosx-version-min : : propagated optional ;
+
+#############################################################################
+
+if [ MATCH (--debug-configuration) : [ modules.peek : ARGV ] ]
+{
+    .debug-configuration = true ;
+}
+
+feature.extend toolset : clang-darwin ;
+import clang-unix ;
+feature.extend-subfeature toolset clang : platform : darwin ;
+
+toolset.inherit-generators clang-darwin
+  <toolset>clang <toolset-clang:platform>darwin
+  : clang-unix 
+  : clang-unix.mingw.link clang-unix.mingw.link.dll 
+  ;
+
+generators.override clang-darwin.prebuilt : builtin.prebuilt ;
+generators.override clang-darwin.searched-lib-generator : searched-lib-generator ;
+
+# Override default do-nothing generators.
+generators.override clang-darwin.compile.c.pch   : pch.default-c-pch-generator   ;
+generators.override clang-darwin.compile.c++.pch : pch.default-cpp-pch-generator ;
+
+type.set-generated-target-suffix PCH : <toolset>clang-darwin : gch ;
+
+toolset.inherit-rules clang-darwin : clang-unix : localize ;
+toolset.inherit-flags clang-darwin : clang-unix     
+  :  <runtime-link>static
+     <architecture>arm/<address-model>32
+     <architecture>arm/<address-model>64
+     <architecture>arm/<instruction-set>
+     <architecture>x86/<address-model>32
+     <architecture>x86/<address-model>64
+     <architecture>x86/<instruction-set>
+     <architecture>power/<address-model>32
+     <architecture>power/<address-model>64
+     <architecture>power/<instruction-set>  ;
+
+# Options:
+#
+#   <root>PATH
+#       Platform root path. The common autodetection will set this to
+#       "/Developer". And when a command is given it will be set to
+#       the corresponding "*.platform/Developer" directory.
+#
+rule init ( version ? : command * : options * : requirement * )
+{
+    # First time around, figure what is host OSX version
+    if ! $(.host-osx-version)  
+    {
+        .host-osx-version = [ MATCH "^([0-9.]+)"
+          : [ SHELL "/usr/bin/sw_vers -productVersion" ] ] ;
+        if $(.debug-configuration)
+        {
+            ECHO notice: OSX version on this machine is $(.host-osx-version) ;
+        }
+    }
+                      
+    # - The root directory of the tool install.
+    local root = [ feature.get-values <root> : $(options) ] ;
+    
+    # - The bin directory where to find the commands to execute.
+    local bin ;
+    
+    # - The configured compile driver command.
+    local command = [ common.get-invocation-command clang-darwin : clang++ : $(command) ] ;
+    
+    # The version as reported by the compiler
+    local real-version ;
+    
+    # - Autodetect the root and bin dir if not given.
+    if $(command)
+    {
+        bin ?= [ common.get-absolute-tool-path $(command[1]) ] ;
+        if $(bin) = "/usr/bin"
+        {
+            root ?= /Developer ;
+        }
+        else
+        {
+            local r = $(bin:D) ;
+            r = $(r:D) ;
+            root ?= $(r) ;
+        }
+    }
+    
+    # - Autodetect the version if not given.
+    if $(command)
+    {
+        # - The 'command' variable can have multiple elements. When calling
+        #   the SHELL builtin we need a single string.
+        local command-string = $(command:J=" ") ;
+        real-version = [ MATCH "^([0-9.]+)"
+            : [ SHELL "$(command-string) -dumpversion" ] ] ;
+        version ?= $(real-version) ;
+    }
+    
+    .real-version.$(version) = $(real-version) ;
+    
+    # - Define the condition for this toolset instance.
+    local condition =
+        [ common.check-init-parameters clang-darwin $(requirement) : version $(version) ] ;
+    
+    # - Set the toolset generic common options.
+    common.handle-options clang-darwin : $(condition) : $(command) : $(options) ;
+    
+    # - Set the link flags common with the clang-unix toolset.
+    clang-unix.init-link-flags clang-darwin darwin $(condition) ;
+
+    # - The symbol strip program.
+    local strip ;
+    if <striper> in $(options)
+    {
+        # We can turn off strip by specifying it as empty. In which
+        # case we switch to using the linker to do the strip.
+        flags clang-darwin.link.dll OPTIONS
+            $(condition)/<main-target-type>LIB/<link>shared/<address-model>32/<strip>on : -Wl,-x ;
+        flags clang-darwin.link.dll OPTIONS
+            $(condition)/<main-target-type>LIB/<link>shared/<address-model>/<strip>on : -Wl,-x ;
+        flags clang-darwin.link OPTIONS
+            $(condition)/<main-target-type>EXE/<address-model>32/<strip>on : -s ;
+        flags clang-darwin.link OPTIONS
+            $(condition)/<main-target-type>EXE/<address-model>/<strip>on : -s ;
+    }
+    else
+    {
+        # Otherwise we need to find a strip program to use. And hence
+        # also tell the link action that we need to use a strip
+        # post-process.
+        flags clang-darwin.link NEED_STRIP $(condition)/<strip>on : "" ;
+        strip =
+            [ common.get-invocation-command clang-darwin
+                : strip : [ feature.get-values <striper> : $(options) ] : $(bin) : search-path ] ;
+        flags clang-darwin.link .STRIP $(condition) : $(strip[1]) ;
+        if $(.debug-configuration)
+        {
+            ECHO notice: using strip for $(condition) at $(strip[1]) ;
+        }
+    }
+
+    # - The archive builder (libtool is the default as creating
+    #   archives in darwin is complicated.
+    local archiver =
+        [ common.get-invocation-command clang-darwin
+            : libtool : [ feature.get-values <archiver> : $(options) ] : $(bin) : search-path ] ;
+    flags clang-darwin.archive .LIBTOOL $(condition) : $(archiver[1]) ;
+    if $(.debug-configuration)
+    {
+        ECHO notice: using archiver for $(condition) at $(archiver[1]) ;
+    }
+    
+    # - Initialize the SDKs available in the root for this tool.
+    local sdks = [ init-available-sdk-versions $(condition) : $(root) ] ;
+    
+    #~ ECHO --- ;
+    #~ ECHO --- bin :: $(bin) ;
+    #~ ECHO --- root :: $(root) ;
+    #~ ECHO --- version :: $(version) ;
+    #~ ECHO --- condition :: $(condition) ;
+    #~ ECHO --- strip :: $(strip) ;
+    #~ ECHO --- archiver :: $(archiver) ;
+    #~ ECHO --- sdks :: $(sdks) ;
+    #~ ECHO --- ;
+    #~ EXIT ;
+}
+
+# Add and set options for a discovered SDK version.
+local rule init-sdk ( condition * : root ? : version + : version-feature ? )
+{
+    local rule version-to-feature ( version + )
+    {
+        switch $(version[1])
+        {
+            case iphone* :
+            {
+                return $(version[1])-$(version[2-]:J=.) ;
+            }
+            case mac* :
+            {
+                return $(version[2-]:J=.) ;
+            }
+            case * :
+            {
+                return $(version:J=.) ;
+            }
+        }
+    }
+    
+    if $(version-feature)
+    {
+        if $(.debug-configuration)
+        {
+            ECHO notice: available sdk for $(condition)/<macosx-version>$(version-feature) at $(sdk) ;
+        }
+        
+        # Add the version to the features for specifying them.
+        if ! $(version-feature) in [ feature.values macosx-version ]
+        {
+            feature.extend macosx-version : $(version-feature) ;
+        }
+        if ! $(version-feature) in [ feature.values macosx-version-min ]
+        {
+            feature.extend macosx-version-min : $(version-feature) ;
+        }
+        
+        # Set the flags the version needs to compile with, first
+        # generic options.
+        flags clang-darwin.compile OPTIONS $(condition)/<macosx-version>$(version-feature)
+            : -isysroot $(sdk) ;
+        flags clang-darwin.link OPTIONS $(condition)/<macosx-version>$(version-feature)
+            : -isysroot $(sdk) ;
+        
+        # Then device variation options.
+        switch $(version[1])
+        {
+            case iphone* :
+            {
+                flags clang-darwin.compile OPTIONS <macosx-version-min>$(version-feature)
+                    : -miphoneos-version-min=$(version[2-]:J=.) ;
+                flags clang-darwin.link OPTIONS <macosx-version-min>$(version-feature)
+                    : -miphoneos-version-min=$(version[2-]:J=.) ;
+            }
+            
+            case mac* :
+            {
+                flags clang-darwin.compile OPTIONS <macosx-version-min>$(version-feature)
+                    : -miphoneos-version-min=$(version[2-]:J=.) ;
+                flags clang-darwin.link OPTIONS <macosx-version-min>$(version-feature)
+                    : -miphoneos-version-min=$(version[2-]:J=.) ;
+            }
+        }
+        
+        return $(version-feature) ;
+    }
+    else if $(version[4])
+    {
+        # We have a patch version of an SDK. We want to set up
+        # both the specific patch version, and the minor version.
+        # So we recurse to set up the minor version. Plus the minor version.
+        return
+            [ init-sdk $(condition) : $(root)
+                : $(version[1-3]) : [ version-to-feature $(version[1-3]) ] ]
+            [ init-sdk $(condition) : $(root)
+                : $(version) : [ version-to-feature $(version) ] ] ;
+    }
+    else
+    {
+        # Yes, this is intentionally recursive.
+        return
+            [ init-sdk $(condition) : $(root)
+                : $(version) : [ version-to-feature $(version) ] ] ;
+    }
+}
+
+# Determine the MacOSX SDK versions installed and their locations.
+local rule init-available-sdk-versions ( condition * : root ? )
+{
+    root ?= /Developer ;
+    local sdks-root = $(root)/SDKs ;
+    local sdks = [ GLOB $(sdks-root) : MacOSX*.sdk iPhoneOS*.sdk iPhoneSimulator*.sdk ] ;
+    local result ;
+    for local sdk in $(sdks)
+    {
+        local sdk-match = [ MATCH ([^0-9]+)([0-9]+)[.]([0-9x]+)[.]?([0-9x]+)? : $(sdk:D=) ] ;
+        local sdk-platform = $(sdk-match[1]:L) ;
+        local sdk-version = $(sdk-match[2-]) ;
+        if $(sdk-version)
+        {
+            switch $(sdk-platform)
+            {
+                case macosx :
+                {
+                    sdk-version = mac $(sdk-version) ;
+                }
+                case iphoneos :
+                {
+                    sdk-version = iphone $(sdk-version) ;
+                }
+                case iphonesimulator :
+                {
+                    sdk-version = iphonesim $(sdk-version) ;
+                }
+                case * :
+                {
+                    sdk-version = $(sdk-version:J=-) ;
+                }
+            }
+            result += [ init-sdk $(condition) : $(sdk) : $(sdk-version) ] ;
+        }
+    }
+    return $(result) ;
+}
+
+# Generic options.
+flags clang-darwin.compile OPTIONS <flags> ;
+
+# The following adds objective-c support to clang-darwin.
+# Thanks to http://thread.gmane.org/gmane.comp.lib.boost.build/13759
+
+generators.register-c-compiler clang-darwin.compile.m : OBJECTIVE_C : OBJ : <toolset>clang-darwin ;
+generators.register-c-compiler clang-darwin.compile.mm : OBJECTIVE_CPP : OBJ : <toolset>clang-darwin ;
+
+rule setup-address-model ( targets * : sources * : properties * )
+{
+    local ps = [ property-set.create $(properties) ] ;
+    local arch = [ $(ps).get <architecture> ] ;
+    local address-model = [ $(ps).get <address-model> ] ;
+    local osx-version = [ $(ps).get <macosx-version> ] ;
+    local clang-unix-version = [ $(ps).get <toolset-clang-darwin:version> ] ;
+    clang-unix-version = $(.real-version.$(clang-unix-version)) ;
+    local options ;
+    
+    local support-ppc64 = 1 ;
+    
+    osx-version ?= $(.host-osx-version) ;
+
+    switch $(osx-version)
+    {
+        case iphone* :
+        {
+            support-ppc64 = ;
+        }
+        
+        case * :
+        if $(osx-version) && ! [ version.version-less [ regex.split $(osx-version) \\. ] : 10 6 ]
+        {
+            # When targeting 10.6:
+            # - clang-unix 4.2 will give a compiler errir if ppc64 compilation is requested
+            # - clang-unix 4.0 will compile fine, somehow, but then fail at link time
+            support-ppc64 = ;
+        }
+    }
+    switch $(arch)
+    {
+        case combined : 
+        {
+            if $(address-model) = 32_64 {
+                if $(support-ppc64) {
+                    options = -arch i386 -arch ppc -arch x86_64 -arch ppc64 ;                    
+                } else {
+                    # Build 3-way binary
+                    options = -arch i386 -arch ppc -arch x86_64 ;
+                }                                
+            } else if $(address-model) = 64 {
+                if $(support-ppc64) {
+                    options = -arch x86_64 -arch ppc64 ;
+                } else {
+                    errors.user-error "64-bit PPC compilation is not supported when targeting OSX 10.6 or later" ;
+                }                
+            } else {
+                options = -arch i386 -arch ppc ;
+            }
+        }
+        
+        case x86 : 
+        {
+            if $(address-model) = 32_64 {
+                options = -arch i386 -arch x86_64 ;
+            } else if $(address-model) = 64 {
+                options = -arch x86_64 ;
+            } else {
+                options = -arch i386 ;
+            }
+        }        
+        
+        case power :
+        {
+            if ! $(support-ppc64) 
+              && (  $(address-model) = 32_64 || $(address-model) = 64 )
+            {
+                errors.user-error "64-bit PPC compilation is not supported when targeting OSX 10.6 or later" ;
+            }
+            
+            if $(address-model) = 32_64 {
+                options = -arch ppc -arch ppc64 ;
+            } else if $(address-model) = 64 {
+                options = -arch ppc64 ;
+            } else {
+                options = -arch ppc ;
+            }
+        }
+        
+        case arm :
+        {
+            options = -arch armv6 ;
+        }        
+    }
+    
+    if $(options)
+    {
+        OPTIONS on $(targets) += $(options) ;
+    }            
+}
+
+rule setup-threading ( targets * : sources * : properties * )
+{
+    clang-unix.setup-threading $(targets) : $(sources) : $(properties) ;
+}
+
+rule setup-fpic ( targets * : sources * : properties * )
+{
+    clang-unix.setup-fpic $(targets) : $(sources) : $(properties) ;
+}
+
+rule compile.m ( targets * : sources * : properties * )
+{
+    LANG on $(<) = "-x objective-c" ;
+    clang-unix.setup-fpic $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+}
+
+actions compile.m
+{
+    "$(CONFIG_COMMAND)" $(LANG) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
+}
+
+rule compile.mm  ( targets * : sources * : properties * )
+{
+    LANG on $(<) = "-x objective-c++" ;
+    clang-unix.setup-fpic $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+}
+
+actions compile.mm
+{
+    "$(CONFIG_COMMAND)" $(LANG) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
+}
+
+# Set the max header padding to allow renaming of libs for installation.
+flags clang-darwin.link.dll OPTIONS : -headerpad_max_install_names ;
+
+# To link the static runtime we need to link to all the core runtime libraries.
+flags clang-darwin.link OPTIONS <runtime-link>static
+    : -nodefaultlibs -shared-libgcc -lstdc++-static -lgcc_eh -lgcc -lSystem ;
+
+# Strip as much as possible when optimizing.
+flags clang-darwin.link OPTIONS <optimization>speed : -Wl,-dead_strip -no_dead_strip_inits_and_terms ;
+flags clang-darwin.link OPTIONS <optimization>space : -Wl,-dead_strip -no_dead_strip_inits_and_terms ;
+
+# Dynamic/shared linking.
+flags clang-darwin.compile OPTIONS <link>shared : -dynamic ;
+
+# Misc options.
+flags clang-darwin.compile OPTIONS : -gdwarf-2 ;
+
+# Add the framework names to use.
+flags clang-darwin.link FRAMEWORK <framework> ;
+
+# This is flag is useful for debugging the link step
+# uncomment to see what libtool is doing under the hood
+#~ flags clang-darwin.link.dll OPTIONS : -Wl,-v ;
+
+_ = " " ;
+
+# set up the -F option to include the paths to any frameworks used.
+local rule prepare-framework-path ( target + )
+{
+    # The -framework option only takes basename of the framework.
+    # The -F option specifies the directories where a framework
+    # is searched for.  So, if we find <framework> feature
+    # with some path, we need to generate property -F option.
+    local framework-paths = [ on $(target) return $(FRAMEWORK:D) ] ;
+
+    # Be sure to generate no -F if there's no path.
+    for local framework-path in $(framework-paths)
+    {
+        if $(framework-path) != ""
+        {
+            FRAMEWORK_PATH on $(target) += -F$(framework-path) ;
+        }
+    }
+}
+
+rule link ( targets * : sources * : properties * )
+{
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+    prepare-framework-path $(<) ;
+}
+
+# Note that using strip without any options was reported to result in broken
+# binaries, at least on OS X 10.5.5, see:
+#    http://svn.boost.org/trac/boost/ticket/2347
+# So we pass -S -x.
+actions link bind LIBRARIES
+{
+    "$(CONFIG_COMMAND)" -L"$(LINKPATH)" -o "$(<)" "$(>)" "$(LIBRARIES)" -l$(FINDLIBS-SA) -l$(FINDLIBS-ST) $(FRAMEWORK_PATH) -framework$(_)$(FRAMEWORK:D=:S=) $(OPTIONS) $(USER_OPTIONS)
+    $(NEED_STRIP)"$(.STRIP)" $(NEED_STRIP)-S $(NEED_STRIP)-x $(NEED_STRIP)"$(<)"
+}
+
+rule link.dll ( targets * : sources * : properties * )
+{
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+    prepare-framework-path $(<) ;
+}
+
+actions link.dll bind LIBRARIES
+{
+    "$(CONFIG_COMMAND)" -dynamiclib -Wl,-single_module -install_name "$(<:B)$(<:S)" -L"$(LINKPATH)" -o "$(<)" "$(>)" "$(LIBRARIES)" -l$(FINDLIBS-SA) -l$(FINDLIBS-ST) $(FRAMEWORK_PATH) -framework$(_)$(FRAMEWORK:D=:S=) $(OPTIONS) $(USER_OPTIONS)
+}
+
+# We use libtool instead of ar to support universal binary linking
+# TODO: Find a way to use the underlying tools, i.e. lipo, to do this.
+actions piecemeal archive
+{
+    "$(.LIBTOOL)" -static -o "$(<:T)"  $(ARFLAGS)  "$(>:T)"
+}
diff --git a/v2/tools/clang-unix.jam b/v2/tools/clang-unix.jam
new file mode 100644
index 000000000..5c55faf84
--- /dev/null
+++ b/v2/tools/clang-unix.jam
@@ -0,0 +1,990 @@
+# Copyright 2001 David Abrahams.
+# Copyright 2002-2006 Rene Rivera.
+# Copyright 2002-2003 Vladimir Prus.
+#  Copyright (c) 2005 Reece H. Dunn.
+# Copyright 2006 Ilya Sokolov.
+# Copyright 2007 Roland Schwarz
+# Copyright 2007 Boris Gubenko.
+#
+# Distributed under the Boost Software License, Version 1.0.
+#    (See accompanying file LICENSE_1_0.txt or copy at
+#          http://www.boost.org/LICENSE_1_0.txt)
+
+import "class" : new ;
+import common ;
+import errors ;
+import feature ;
+import generators ;
+import os ;
+import pch ;
+import property ;
+import property-set ;
+import toolset ;
+import type ;
+import rc ;
+import regex ;
+import set ;
+import unix ;
+
+
+if [ MATCH (--debug-configuration) : [ modules.peek : ARGV ] ]
+{
+    .debug-configuration = true ;
+}
+
+
+feature.extend toolset : clang-unix ;
+# feature.subfeature toolset clang : flavor : : optional ;
+
+toolset.inherit-generators clang-unix : unix : unix.link unix.link.dll ;
+toolset.inherit-flags clang-unix : unix ;
+toolset.inherit-rules clang-unix : unix ;
+
+generators.override clang-unix.prebuilt : builtin.prebuilt ;
+generators.override clang-unix.searched-lib-generator : searched-lib-generator ;
+
+# Make clang-unix toolset object files use the "o" suffix on all platforms.
+type.set-generated-target-suffix OBJ : <toolset>clang-unix : o ;
+type.set-generated-target-suffix OBJ : <toolset>clang-unix <target-os>windows : o ;
+type.set-generated-target-suffix OBJ : <toolset>clang-unix <target-os>cygwin : o ;
+
+# Initializes the clang-unix toolset for the given version. If necessary, command may
+# be used to specify where the compiler is located. The parameter 'options' is a
+# space-delimited list of options, each one specified as
+# <option-name>option-value. Valid option names are: cxxflags, linkflags and
+# linker-type. Accepted linker-type values are aix, darwin, gnu, hpux, osf or
+# sun and the default value will be selected based on the current OS.
+# Example:
+#   using clang-unix : 1.5 : : <cxxflags>foo <linkflags>bar <linker-type>sun ;
+#
+rule init ( version ? : command * : options * )
+{
+    # Information about the clang command...
+    #   The command.
+    local command = [ common.get-invocation-command clang-unix : clang++ : $(command) ] ;
+    #   The root directory of the tool install.
+    local root = [ feature.get-values <root> : $(options) ] ;
+    #   The bin directory where to find the command to execute.
+    local bin ;
+    #   The flavor of compiler.
+    local flavor = [ feature.get-values <flavor> : $(options) ] ;
+    #   Autodetect the root and bin dir if not given.
+    if $(command)
+    {
+        bin ?= [ common.get-absolute-tool-path $(command[-1]) ] ;
+        root ?= $(bin:D) ;
+    }
+    # The 'command' variable can have multiple elements. When calling
+    # the SHELL builtin we need a single string.
+    local command-string = $(command:J=" ") ;
+    #   Autodetect the version and flavor if not given.
+    if $(command)
+    {    
+        local machine = [ MATCH "^([^ ]+)"
+            : [ SHELL "$(command-string) -dumpmachine" ] ] ;
+        version ?= [ MATCH "^([0-9.]+)"
+            : [ SHELL "$(command-string) -dumpversion" ] ] ;
+        switch $(machine:L)
+        {
+            case *mingw* : flavor ?= mingw ;
+        }
+    }
+
+    local condition ;
+    if $(flavor)
+    {
+        condition = [ common.check-init-parameters clang-unix
+            : version $(version)
+            : flavor $(flavor)
+            ] ;
+    }
+    else
+    {
+        condition = [ common.check-init-parameters clang-unix
+            : version $(version)
+            ] ;
+        condition = $(condition) ;  #/<toolset-clang-unix:flavor> ;
+    }
+
+    common.handle-options clang-unix : $(condition) : $(command) : $(options) ;
+
+    local linker = [ feature.get-values <linker-type> : $(options) ] ;
+    # The logic below should actually be keyed on <target-os>
+    if ! $(linker)
+    {
+        if [ os.name ] = OSF
+        {
+            linker = osf ;
+        }
+        else if [ os.name ] = HPUX
+        {
+            linker = hpux ;
+        }
+        else if [ os.name ] = AIX
+        {
+            linker = aix ;
+        }
+        else if [ os.name ] = SOLARIS
+        {
+            linker = sun ;
+        }        
+        else
+        {
+            linker = gnu ;
+        }
+    }
+    init-link-flags clang-unix $(linker) $(condition) ;
+
+
+    # If clang is installed in non-standard location, we'd need to add
+    # LD_LIBRARY_PATH when running programs created with it (for unit-test/run
+    # rules).
+    if $(command)
+    {
+        # On multilib 64-bit boxes, there are both 32-bit and 64-bit libraries
+        # and all must be added to LD_LIBRARY_PATH. The linker will pick the
+        # right onces. Note that we don't provide a clean way to build 32-bit
+        # binary with 64-bit compiler, but user can always pass -m32 manually.
+        local lib_path = $(root)/bin $(root)/lib $(root)/lib32 $(root)/lib64 ;
+        if $(.debug-configuration)
+        {
+            ECHO notice: using clang libraries :: $(condition) :: $(lib_path) ;
+        }
+        toolset.flags clang-unix.link RUN_PATH $(condition) : $(lib_path) ;
+    }
+
+    # If it's not a system clang install we should adjust the various programs as
+    # needed to prefer using the install specific versions. This is essential
+    # for correct use of MinGW and for cross-compiling.
+    
+    local nl = "
+" ;
+
+    # - The archive builder.
+    local archiver = [ common.get-invocation-command clang-unix
+            : [ NORMALIZE_PATH [ MATCH "(.*)[$(nl)]+" : [ SHELL "$(command-string) -print-prog-name=ar" ] ] ]
+            : [ feature.get-values <archiver> : $(options) ] 
+            : $(bin) 
+            : search-path ] ;
+    toolset.flags clang-unix.archive .AR $(condition) : $(archiver[1]) ;
+    if $(.debug-configuration)
+    {
+        ECHO notice: using clang-unix archiver :: $(condition) :: $(archiver[1]) ;
+    }
+
+    # - Ranlib
+    local ranlib = [ common.get-invocation-command clang-unix
+            : [ NORMALIZE_PATH [ MATCH "(.*)[$(nl)]+" : [ SHELL "$(command-string) -print-prog-name=ranlib" ] ] ]
+            : [ feature.get-values <ranlib> : $(options) ] 
+            : $(bin) 
+            : search-path ] ;
+    toolset.flags clang-unix.archive .RANLIB $(condition) : $(ranlib[1]) ;
+    if $(.debug-configuration)
+    {
+        ECHO notice: using clang-unix ranlib :: $(condition) :: $(ranlib[1]) ;
+    }
+
+
+    # - The resource compiler.
+    local rc =
+        [ common.get-invocation-command-nodefault clang-unix
+            : windres : [ feature.get-values <rc> : $(options) ] : $(bin) : search-path ] ;
+    local rc-type =
+        [ feature.get-values <rc-type> : $(options) ] ;
+    rc-type ?= windres ;
+    if ! $(rc)
+    {
+        # If we can't find an RC compiler we fallback to a null RC compiler that
+        # creates empty object files. This allows the same Jamfiles to work
+        # across the board. The null RC uses the assembler to create the empty
+        # objects, so configure that.
+        rc = [ common.get-invocation-command clang-unix : as : : $(bin) : search-path ] ;
+        rc-type = null ;
+    }
+    rc.configure $(rc) : $(condition) : <rc-type>$(rc-type) ;
+}
+
+if [ os.name ] = NT
+{
+    # This causes single-line command invocation to not go through .bat files,
+    # thus avoiding command-line length limitations.
+    JAMSHELL = % ;
+}
+
+generators.register-c-compiler clang-unix.compile.c++ : CPP : OBJ : <toolset>clang-unix ;
+generators.register-c-compiler clang-unix.compile.c   : C   : OBJ : <toolset>clang-unix ;
+generators.register-c-compiler clang-unix.compile.asm : ASM : OBJ : <toolset>clang-unix ;
+
+# pch support
+
+# The compiler looks for a precompiled header in each directory just before it
+# looks for the include file in that directory. The name searched for is the
+# name specified in the #include directive with ".gch" suffix appended. The
+# logic in clang-unix-pch-generator will make sure that BASE_PCH suffix is appended to
+# full name of the header.
+
+type.set-generated-target-suffix PCH : <toolset>clang-unix : gch ;
+
+# clang-specific pch generator.
+class clang-unix-pch-generator : pch-generator
+{
+    import project ;
+    import property-set ;
+    import type ;
+
+    rule run-pch ( project name ? : property-set : sources + )
+    {
+        # Find the header in sources. Ignore any CPP sources.
+        local header ;
+        for local s in $(sources)
+        {
+            if [ type.is-derived [ $(s).type ] H ]
+            {
+                header = $(s) ;
+            }
+        }
+
+        # Error handling: Base header file name should be the same as the base
+        # precompiled header name.
+        local header-name = [ $(header).name ] ;
+        local header-basename = $(header-name:B) ;
+        if $(header-basename) != $(name)
+        {
+            local location = [ $(project).project-module ] ;
+            errors.user-error "in" $(location)": pch target name `"$(name)"' should be the same as the base name of header file `"$(header-name)"'" ;
+        }
+
+        local pch-file = [ generator.run $(project) $(name) : $(property-set)
+            : $(header) ] ;
+
+        # return result of base class and pch-file property as usage-requirements
+        return
+            [ property-set.create <pch-file>$(pch-file) <cflags>-Winvalid-pch ]
+            $(pch-file)
+          ;
+    }
+
+    # Calls the base version specifying source's name as the name of the created
+    # target. As result, the PCH will be named whatever.hpp.gch, and not
+    # whatever.gch.
+    rule generated-targets ( sources + : property-set : project name ? )
+    {
+        name = [ $(sources[1]).name ] ;
+        return [ generator.generated-targets $(sources)
+          : $(property-set) : $(project) $(name) ] ;
+    }
+}
+
+# Note: the 'H' source type will catch both '.h' header and '.hpp' header. The
+# latter have HPP type, but HPP type is derived from H. The type of compilation
+# is determined entirely by the destination type.
+generators.register [ new clang-unix-pch-generator clang-unix.compile.c.pch   : H :   C_PCH : <pch>on <toolset>clang-unix ] ;
+generators.register [ new clang-unix-pch-generator clang-unix.compile.c++.pch : H : CPP_PCH : <pch>on <toolset>clang-unix ] ;
+
+# Override default do-nothing generators.
+generators.override clang-unix.compile.c.pch   : pch.default-c-pch-generator   ;
+generators.override clang-unix.compile.c++.pch : pch.default-cpp-pch-generator ;
+
+toolset.flags clang-unix.compile PCH_FILE <pch>on : <pch-file> ;
+
+# Declare flags and action for compilation.
+toolset.flags clang-unix.compile OPTIONS <optimization>off   : -O0 ;
+toolset.flags clang-unix.compile OPTIONS <optimization>speed : -O3 ;
+toolset.flags clang-unix.compile OPTIONS <optimization>space : -Os ;
+
+toolset.flags clang-unix.compile OPTIONS <inlining>off  : -fno-inline ;
+toolset.flags clang-unix.compile OPTIONS <inlining>on   : -Wno-inline ;
+toolset.flags clang-unix.compile OPTIONS <inlining>full : -finline-functions -Wno-inline ;
+
+toolset.flags clang-unix.compile OPTIONS <warnings>off : -w ;
+toolset.flags clang-unix.compile OPTIONS <warnings>on  : -Wall ;
+toolset.flags clang-unix.compile OPTIONS <warnings>all : -Wall -pedantic ;
+toolset.flags clang-unix.compile OPTIONS <warnings-as-errors>on : -Werror ;
+
+toolset.flags clang-unix.compile OPTIONS <debug-symbols>on : -g ;
+toolset.flags clang-unix.compile OPTIONS <profiling>on : -pg ;
+toolset.flags clang-unix.compile OPTIONS <rtti>off : -fno-rtti ;
+
+rule setup-fpic ( targets * : sources * : properties * )
+{
+    local link = [ feature.get-values link : $(properties) ] ;
+    if $(link) = shared
+    {        
+        local target = [ feature.get-values target-os : $(properties) ] ;
+        
+        # This logic will add -fPIC for all compilations:
+        #
+        # lib a : a.cpp b ;
+        # obj b : b.cpp ;
+        # exe c : c.cpp a d ;
+        # obj d : d.cpp ;
+        #
+        # This all is fine, except that 'd' will be compiled with -fPIC even though
+        # it is not needed, as 'd' is used only in exe. However, it is hard to
+        # detect where a target is going to be used. Alternatively, we can set -fPIC
+        # only when main target type is LIB but than 'b' would be compiled without
+        # -fPIC which would lead to link errors on x86-64. So, compile everything
+        # with -fPIC.
+        #
+        # Yet another alternative would be to create a propagated <sharedable>
+        # feature and set it when building shared libraries, but that would be hard
+        # to implement and would increase the target path length even more.
+        
+        # On Windows, fPIC is default, specifying -fPIC explicitly leads to
+        # a warning.
+        if $(target) != cygwin && $(target) != windows
+        {
+            OPTIONS on $(targets) += -fPIC ;
+        }        
+    }
+}
+
+rule setup-address-model ( targets * : sources * : properties * )
+{
+    local model = [ feature.get-values address-model : $(properties) ] ;
+    if $(model)
+    {
+        local option ;
+        local os = [ feature.get-values target-os : $(properties) ] ;
+        if $(os) = aix
+        {
+            if $(model) = 32
+            {
+                option = -maix32 ;
+            }
+            else
+            {
+                option = -maix64 ;
+            }
+        }
+        else
+        {
+            if $(model) = 32
+            {
+                option = -m32 ;
+            }
+            else if $(model) = 64
+            {
+                option = -m64 ;
+            }
+            # For darwin, the model can be 32_64. darwin.jam will handle that
+            # on its own.
+        }
+        OPTIONS on $(targets) += $(option) ;
+    }    
+}
+
+
+# FIXME: this should not use os.name.
+if [ os.name ] != NT && [ os.name ] != OSF && [ os.name ] != HPUX && [ os.name ] != AIX
+{
+    # OSF does have an option called -soname but it does not seem to work as
+    # expected, therefore it has been disabled.
+    HAVE_SONAME   = "" ;
+    SONAME_OPTION = -h ;
+}
+
+# HPUX, for some reason, seem to use '+h', not '-h'.
+if [ os.name ] = HPUX
+{
+    HAVE_SONAME   = "" ;
+    SONAME_OPTION = +h ;
+}
+
+toolset.flags clang-unix.compile USER_OPTIONS <cflags> ;
+toolset.flags clang-unix.compile.c++ USER_OPTIONS <cxxflags> ;
+toolset.flags clang-unix.compile DEFINES <define> ;
+toolset.flags clang-unix.compile INCLUDES <include> ;
+toolset.flags clang-unix.compile.c++ TEMPLATE_DEPTH <c++-template-depth> ;
+
+rule compile.c++.pch ( targets * : sources * : properties * )
+{
+    setup-threading $(targets) : $(sources) : $(properties) ;
+    setup-fpic $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+}
+
+actions compile.c++.pch
+{
+    "$(CONFIG_COMMAND)" -x c++-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
+}
+
+rule compile.c.pch ( targets * : sources * : properties * )
+{
+    setup-threading $(targets) : $(sources) : $(properties) ;
+    setup-fpic $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;    
+}
+
+actions compile.c.pch
+{
+    "$(CONFIG_COMMAND)" -x c-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
+}
+
+rule compile.c++ ( targets * : sources * : properties * )
+{
+    setup-threading $(targets) : $(sources) : $(properties) ;
+    setup-fpic $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+    
+    # Some extensions are compiled as C++ by default. For others, we need to
+    # pass -x c++. We could always pass -x c++ but distcc does not work with it.
+    if ! $(>:S) in .cc .cp .cxx .cpp .c++ .C
+    {
+        LANG on $(<) = "-x c++" ;
+    }
+    DEPENDS $(<) : [ on $(<) return $(PCH_FILE) ] ;
+    
+    # Here we want to raise the template-depth parameter value to something
+    # higher than the default value of 17. Note that we could do this using the
+    # feature.set-default rule but we do not want to set the default value for
+    # all toolsets as well.
+    #
+    # TODO: This 'modified default' has been inherited from some 'older Boost
+    # Build implementation' and has most likely been added to make some Boost
+    # library parts compile correctly. We should see what exactly prompted this
+    # and whether we can get around the problem more locally.
+    local template-depth = [ on $(<) return $(TEMPLATE_DEPTH) ] ;
+    if ! $(template-depth)
+    {
+        TEMPLATE_DEPTH on $(<) = 128 ;
+    }
+}
+
+rule compile.c ( targets * : sources * : properties * )
+{
+    setup-threading $(targets) : $(sources) : $(properties) ;
+    setup-fpic $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+    
+    # If we use the name clang++ then default file suffix -> language mapping does
+    # not work. So have to pass -x option. Maybe, we can work around this by
+    # allowing the user to specify both C and C++ compiler names.
+    #if $(>:S) != .c
+    #{
+        LANG on $(<) = "-x c" ;
+    #}
+    DEPENDS $(<) : [ on $(<) return $(PCH_FILE) ] ;
+}
+
+actions compile.c++ bind PCH_FILE
+{
+    "$(CONFIG_COMMAND)" $(LANG) -ftemplate-depth-$(TEMPLATE_DEPTH) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(PCH_FILE:D)" -I"$(INCLUDES)" -c -o "$(<:W)" "$(>:W)"
+}
+
+actions compile.c bind PCH_FILE
+{
+    "$(CONFIG_COMMAND)" $(LANG) $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(PCH_FILE:D)" -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
+}
+
+rule compile.asm
+{
+    LANG on $(<) = "-x assembler-with-cpp" ;
+}
+
+actions compile.asm
+{
+    "$(CONFIG_COMMAND)" $(LANG) $(OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)"
+}
+
+# The class which check that we don't try to use the <runtime-link>static
+# property while creating or using shared library, since it's not supported by
+# clang/libc.
+class clang-unix-linking-generator : unix-linking-generator
+{
+    rule run ( project name ? : property-set : sources + )
+    {
+        # TODO: Replace this with the use of a target-os property.
+        local no-static-link = ;
+        if [ modules.peek : UNIX ]
+        {
+            switch [ modules.peek : JAMUNAME ]
+            {
+                case * : no-static-link = true ;
+            }
+        }
+
+        local properties = [ $(property-set).raw ] ;
+        local reason ;
+        if $(no-static-link) && <runtime-link>static in $(properties)
+        {
+            if <link>shared in $(properties)
+            {
+                reason =
+                    "On clang, DLL can't be build with '<runtime-link>static'." ;
+            }
+            else if [ type.is-derived $(self.target-types[1]) EXE ]
+            {
+                for local s in $(sources)
+                {
+                    local type = [ $(s).type ] ;
+                    if $(type) &&  [ type.is-derived $(type) SHARED_LIB ]
+                    {
+                        reason =
+                            "On clang, using DLLS together with the"
+                            "<runtime-link>static options is not possible " ;
+                    }
+                }
+            }
+        }
+        if $(reason)
+        {
+            ECHO warning:
+                $(reason) ;
+            ECHO warning:
+                "It is suggested to use '<runtime-link>static' together"
+                "with '<link>static'." ;
+            return ;
+        }
+        else
+        {
+            local generated-targets = [ unix-linking-generator.run $(project)
+                $(name) : $(property-set) : $(sources) ] ;
+            return $(generated-targets) ;
+        }
+    }
+}
+
+# The set of permissible input types is different on mingw.
+# So, define two sets of generators, with mingw generators
+# selected when target-os=windows.
+
+local g ;
+g = [ new clang-unix-linking-generator clang-unix.mingw.link
+      : OBJ SEARCHED_LIB STATIC_LIB IMPORT_LIB
+      : EXE
+      : <toolset>clang-unix <target-os>windows ] ;
+$(g).set-rule-name clang-unix.link ;
+generators.register $(g) ;
+
+g = [ new clang-unix-linking-generator clang-unix.mingw.link.dll
+      : OBJ SEARCHED_LIB STATIC_LIB IMPORT_LIB
+      : IMPORT_LIB SHARED_LIB
+      : <toolset>clang-unix <target-os>windows ] ;
+$(g).set-rule-name clang-unix.link.dll ;
+generators.register $(g) ;
+
+generators.register
+  [ new clang-unix-linking-generator clang-unix.link
+      : LIB OBJ
+      : EXE
+      : <toolset>clang-unix ] ;
+generators.register
+  [ new clang-unix-linking-generator clang-unix.link.dll
+      : LIB OBJ
+      : SHARED_LIB
+      : <toolset>clang-unix ] ;
+
+generators.override clang-unix.mingw.link : clang-unix.link ;
+generators.override clang-unix.mingw.link.dll : clang-unix.link.dll ;
+
+# Cygwin is similar to msvc and mingw in that it uses import libraries.
+# While in simple cases, it can directly link to a shared library,
+# it is believed to be slower, and not always possible. Define cygwin-specific
+# generators here.
+
+g = [ new clang-unix-linking-generator clang-unix.cygwin.link
+      : OBJ SEARCHED_LIB STATIC_LIB IMPORT_LIB
+      : EXE
+      : <toolset>clang-unix <target-os>cygwin ] ;
+$(g).set-rule-name clang-unix.link ;
+generators.register $(g) ;
+
+g = [ new clang-unix-linking-generator clang-unix.cygwin.link.dll
+      : OBJ SEARCHED_LIB STATIC_LIB IMPORT_LIB
+      : IMPORT_LIB SHARED_LIB
+      : <toolset>clang-unix <target-os>cygwin ] ;
+$(g).set-rule-name clang-unix.link.dll ;
+generators.register $(g) ;
+
+generators.override clang-unix.cygwin.link : clang-unix.link ;
+generators.override clang-unix.cygwin.link.dll : clang-unix.link.dll ;
+
+# Declare flags for linking.
+# First, the common flags.
+toolset.flags clang-unix.link OPTIONS <debug-symbols>on : -g ;
+toolset.flags clang-unix.link OPTIONS <profiling>on : -pg ;
+toolset.flags clang-unix.link USER_OPTIONS <linkflags> ;
+toolset.flags clang-unix.link LINKPATH <library-path> ;
+toolset.flags clang-unix.link FINDLIBS-ST <find-static-library> ;
+toolset.flags clang-unix.link FINDLIBS-SA <find-shared-library> ;
+toolset.flags clang-unix.link LIBRARIES <library-file> ;
+
+toolset.flags clang-unix.link.dll .IMPLIB-COMMAND <target-os>windows : "-Wl,--out-implib," ;
+toolset.flags clang-unix.link.dll .IMPLIB-COMMAND <target-os>cygwin : "-Wl,--out-implib," ;
+
+# For <runtime-link>static we made sure there are no dynamic libraries in the
+# link. On HP-UX not all system libraries exist as archived libraries (for
+# example, there is no libunwind.a), so, on this platform, the -static option
+# cannot be specified.
+if [ os.name ] != HPUX
+{
+    toolset.flags clang-unix.link OPTIONS <runtime-link>static : -static ;
+}
+
+# Now, the vendor specific flags.
+# The parameter linker can be either aix, darwin, gnu, hpux, osf or sun.
+rule init-link-flags ( toolset linker condition )
+{
+    switch $(linker)
+    {
+    case aix :
+        {
+        #
+        # On AIX we *have* to use the native linker.
+        #
+        # Using -brtl, the AIX linker will look for libraries with both the .a
+        # and .so extensions, such as libfoo.a and libfoo.so. Without -brtl, the
+        # AIX linker looks only for libfoo.a. Note that libfoo.a is an archived
+        # file that may contain shared objects and is different from static libs
+        # as on Linux.
+        #
+        # The -bnoipath strips the prepending (relative) path of libraries from
+        # the loader section in the target library or executable. Hence, during
+        # load-time LIBPATH (identical to LD_LIBRARY_PATH) or a hard-coded
+        # -blibpath (*similar* to -lrpath/-lrpath-link) is searched. Without
+        # this option, the prepending (relative) path + library name is
+        # hard-coded in the loader section, causing *only* this path to be
+        # searched during load-time. Note that the AIX linker does not have an
+        # -soname equivalent, this is as close as it gets.
+        #
+        # The above options are definately for AIX 5.x, and most likely also for
+        # AIX 4.x and AIX 6.x. For details about the AIX linker see:
+        # http://download.boulder.ibm.com/ibmdl/pub/software/dw/aix/es-aix_ll.pdf
+        #
+
+        toolset.flags $(toolset).link OPTIONS : -Wl,-brtl -Wl,-bnoipath
+            : unchecked ;
+        }
+
+    case darwin :
+        {
+        # On Darwin, the -s option to ld does not work unless we pass -static,
+        # and passing -static unconditionally is a bad idea. So, don't pass -s.
+        # at all, darwin.jam will use separate 'strip' invocation.
+        toolset.flags $(toolset).link RPATH $(condition) : <dll-path> : unchecked ;
+        toolset.flags $(toolset).link RPATH_LINK $(condition) : <xdll-path> : unchecked ;
+        }
+
+    case gnu :
+        {
+        # Strip the binary when no debugging is needed. We use --strip-all flag
+        # as opposed to -s since icc (intel's compiler) is generally
+        # option-compatible with and inherits from the clang toolset, but does not
+        # support -s.
+        toolset.flags $(toolset).link OPTIONS     $(condition)/<strip>on          : -Wl,--strip-all   : unchecked ;
+        toolset.flags $(toolset).link RPATH       $(condition)                    : <dll-path>        : unchecked ;
+        toolset.flags $(toolset).link RPATH_LINK  $(condition)                    : <xdll-path>       : unchecked ;
+        toolset.flags $(toolset).link START-GROUP $(condition)                    : -Wl,--start-group : unchecked ;
+        toolset.flags $(toolset).link END-GROUP   $(condition)                    : -Wl,--end-group   : unchecked ;
+
+        # gnu ld has the ability to change the search behaviour for libraries
+        # referenced by -l switch. These modifiers are -Bstatic and -Bdynamic
+        # and change search for -l switches that follow them. The following list
+        # shows the tried variants.
+        # The search stops at the first variant that has a match.
+        # *nix: -Bstatic -lxxx
+        #    libxxx.a
+        #
+        # *nix: -Bdynamic -lxxx
+        #    libxxx.so
+        #    libxxx.a
+        #
+        # windows (mingw,cygwin) -Bstatic -lxxx
+        #    libxxx.a
+        #    xxx.lib
+        #
+        # windows (mingw,cygwin) -Bdynamic -lxxx
+        #    libxxx.dll.a
+        #    xxx.dll.a
+        #    libxxx.a
+        #    xxx.lib
+        #    cygxxx.dll (*)
+        #    libxxx.dll
+        #    xxx.dll
+        #    libxxx.a
+        #
+        # (*) This is for cygwin
+        # Please note that -Bstatic and -Bdynamic are not a guarantee that a
+        # static or dynamic lib indeed gets linked in. The switches only change
+        # search patterns!
+
+        # On *nix mixing shared libs with static runtime is not a good idea.
+        toolset.flags $(toolset).link FINDLIBS-ST-PFX $(condition)/<runtime-link>shared
+            : -Wl,-Bstatic : unchecked ;
+        toolset.flags $(toolset).link FINDLIBS-SA-PFX $(condition)/<runtime-link>shared
+            : -Wl,-Bdynamic : unchecked ;
+
+        # On windows allow mixing of static and dynamic libs with static
+        # runtime.
+        toolset.flags $(toolset).link FINDLIBS-ST-PFX $(condition)/<runtime-link>static/<target-os>windows
+            : -Wl,-Bstatic : unchecked ;
+        toolset.flags $(toolset).link FINDLIBS-SA-PFX $(condition)/<runtime-link>static/<target-os>windows
+            : -Wl,-Bdynamic : unchecked ;
+        toolset.flags $(toolset).link OPTIONS $(condition)/<runtime-link>static/<target-os>windows
+            : -Wl,-Bstatic : unchecked ;
+        }
+
+    case hpux :
+        {
+        toolset.flags $(toolset).link OPTIONS $(condition)/<strip>on
+            : -Wl,-s : unchecked ;
+        toolset.flags $(toolset).link OPTIONS $(condition)/<link>shared
+            : -fPIC : unchecked ;
+        }
+
+    case osf :
+        {
+        # No --strip-all, just -s.
+        toolset.flags $(toolset).link OPTIONS $(condition)/<strip>on
+            : -Wl,-s : unchecked ;
+        toolset.flags $(toolset).link RPATH $(condition) : <dll-path>
+            : unchecked ;
+        # This does not supports -R.
+        toolset.flags $(toolset).link RPATH_OPTION $(condition) : -rpath
+            : unchecked ;
+        # -rpath-link is not supported at all.
+        }
+
+    case sun :
+        {
+        toolset.flags $(toolset).link OPTIONS $(condition)/<strip>on
+            : -Wl,-s : unchecked ;
+        toolset.flags $(toolset).link RPATH $(condition) : <dll-path>
+            : unchecked ;
+        # Solaris linker does not have a separate -rpath-link, but allows to use
+        # -L for the same purpose.
+        toolset.flags $(toolset).link LINKPATH $(condition) : <xdll-path>
+            : unchecked ;
+
+        # This permits shared libraries with non-PIC code on Solaris.
+        # VP, 2004/09/07: Now that we have -fPIC hardcode in link.dll, the
+        # following is not needed. Whether -fPIC should be hardcoded, is a
+        # separate question.
+        # AH, 2004/10/16: it is still necessary because some tests link against
+        # static libraries that were compiled without PIC.
+        toolset.flags $(toolset).link OPTIONS $(condition)/<link>shared
+            : -mimpure-text : unchecked ;
+        }
+
+    case * :
+        {
+        errors.user-error
+            "$(toolset) initialization: invalid linker '$(linker)'" :
+            "The value '$(linker)' specified for <linker> is not recognized." :
+            "Possible values are 'aix', 'darwin', 'gnu', 'hpux', 'osf' or 'sun'" ;
+        }
+    }
+}
+
+# Enclose the RPATH variable on 'targets' in (double) quotes,
+# unless it's already enclosed in single quotes.
+# This special casing is done because it's common to pass
+# '$ORIGIN' to linker -- and it has to have single quotes
+# to prevent expansion by shell -- and if we add double
+# quotes then preventing properties of single quotes disappear.
+rule quote-rpath ( targets * )
+{
+    local r = [ on $(targets[1]) return $(RPATH) ] ;
+    if ! [ MATCH "('.*')" : $(r) ] 
+    {
+        r = "\"$(r)\"" ;
+    }
+    RPATH on $(targets) = $(r) ;
+}
+
+# Declare actions for linking.
+rule link ( targets * : sources * : properties * )
+{
+    setup-threading $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+    SPACE on $(targets) = " " ;
+    # Serialize execution of the 'link' action, since running N links in
+    # parallel is just slower. For now, serialize only clang links, it might be a
+    # good idea to serialize all links.
+    JAM_SEMAPHORE on $(targets) = <s>clang-unix-link-semaphore ;
+    quote-rpath $(targets) ;
+}
+
+actions link bind LIBRARIES
+{
+    "$(CONFIG_COMMAND)" -L"$(LINKPATH)" -Wl,$(RPATH_OPTION:E=-R)$(SPACE)-Wl,$(RPATH) -Wl,-rpath-link$(SPACE)-Wl,"$(RPATH_LINK)" -o "$(<)" $(START-GROUP) "$(>)" "$(LIBRARIES)" $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS) $(USER_OPTIONS)
+
+}
+
+# Default value. Mostly for the sake of intel-linux that inherits from clang, but
+# does not have the same logic to set the .AR variable. We can put the same
+# logic in intel-linux, but that's hardly worth the trouble as on Linux, 'ar' is
+# always available.
+.AR = ar ;
+.RANLIB = ranlib ;
+
+toolset.flags clang-unix.archive AROPTIONS <archiveflags> ;
+
+rule archive ( targets * : sources * : properties * )
+{
+    # Always remove archive and start again. Here is the rationale from
+    #
+    # Andre Hentz:
+    #
+    # I had a file, say a1.c, that was included into liba.a. I moved a1.c to
+    # a2.c, updated my Jamfiles and rebuilt. My program was crashing with absurd
+    # errors. After some debugging I traced it back to the fact that a1.o was
+    # *still* in liba.a
+    #
+    # Rene Rivera:
+    #
+    # Originally removing the archive was done by splicing an RM onto the
+    # archive action. That makes archives fail to build on NT when they have
+    # many files because it will no longer execute the action directly and blow
+    # the line length limit. Instead we remove the file in a different action,
+    # just before building the archive.
+    #
+    local clean.a = $(targets[1])(clean) ;
+    TEMPORARY $(clean.a) ;
+    NOCARE $(clean.a) ;
+    LOCATE on $(clean.a) = [ on $(targets[1]) return $(LOCATE) ] ;
+    DEPENDS $(clean.a) : $(sources) ;
+    DEPENDS $(targets) : $(clean.a) ;
+    common.RmTemps $(clean.a) : $(targets) ;
+}
+
+# Declare action for creating static libraries.
+# The letter 'r' means to add files to the archive with replacement. Since we
+# remove archive, we don't care about replacement, but there's no option "add
+# without replacement".
+# The letter 'c' suppresses the warning in case the archive does not exists yet.
+# That warning is produced only on some platforms, for whatever reasons.
+actions piecemeal archive
+{
+    "$(.AR)" $(AROPTIONS) rc "$(<)" "$(>)"
+    "$(.RANLIB)" "$(<)"
+}
+
+rule link.dll ( targets * : sources * : properties * )
+{
+    setup-threading $(targets) : $(sources) : $(properties) ;
+    setup-address-model $(targets) : $(sources) : $(properties) ;
+    SPACE on $(targets) = " " ;
+    JAM_SEMAPHORE on $(targets) = <s>clang-unix-link-semaphore ;
+    quote-rpath $(targets) ;
+}
+
+# Differs from 'link' above only by -shared.
+actions link.dll bind LIBRARIES
+{
+    "$(CONFIG_COMMAND)" -L"$(LINKPATH)" -Wl,$(RPATH_OPTION:E=-R)$(SPACE)-Wl,$(RPATH) "$(.IMPLIB-COMMAND)$(<[1])" -o "$(<[-1])" $(HAVE_SONAME)-Wl,$(SONAME_OPTION)$(SPACE)-Wl,$(<[-1]:D=) -shared $(START-GROUP) "$(>)" "$(LIBRARIES)" $(FINDLIBS-ST-PFX) -l$(FINDLIBS-ST) $(FINDLIBS-SA-PFX) -l$(FINDLIBS-SA) $(END-GROUP) $(OPTIONS) $(USER_OPTIONS)
+}
+
+rule setup-threading ( targets * : sources * : properties * )
+{
+    local threading = [ feature.get-values threading : $(properties) ] ;
+    if $(threading) = multi
+    {        
+        local target = [ feature.get-values target-os : $(properties) ] ;
+        local option ;
+        local libs ;
+        
+        switch $(target)
+        {
+            case windows :
+            {
+                option = -mthreads ;
+            }
+            case cygwin :
+            {
+                option = -mthreads ;
+            }
+            case solaris :
+            {
+                option = -pthreads ;
+                libs = rt ;
+            }
+            case beos :
+            {            
+                # BeOS has no threading options, so do not set anything here.
+            }        
+            case *bsd :
+            {
+                option = -pthread ;
+                # There is no -lrt on BSD.
+            }
+            case sgi :
+            {
+                # clang on IRIX does not support multi-threading so do not set anything
+                # here.
+            }
+            case darwin :
+            {
+                # Darwin has no threading options so do not set anything here.
+            }
+            case * :
+            {
+                option = -pthread ;
+                libs = rt ;
+            }
+        }
+    
+        if $(option)
+        {
+            OPTIONS on $(targets) += $(option) ;
+        }
+        if $(libs)
+        {
+            FINDLIBS-SA on $(targets) += $(libs) ;
+        }
+    }    
+}
+
+local rule cpu-flags ( toolset variable : architecture : instruction-set + : values + : default ? )
+{
+    if $(default)
+    {
+        toolset.flags $(toolset) $(variable)
+            <architecture>$(architecture)/<instruction-set>
+            : $(values) ;
+    }
+    toolset.flags $(toolset) $(variable)
+        <architecture>/<instruction-set>$(instruction-set)
+        <architecture>$(architecture)/<instruction-set>$(instruction-set)
+        : $(values) ;
+}
+
+# Set architecture/instruction-set options.
+#
+# x86 and compatible
+cpu-flags clang-unix OPTIONS : x86 : native : -march=native : default ;
+cpu-flags clang-unix OPTIONS : x86 : i386 : -march=i386 ;
+cpu-flags clang-unix OPTIONS : x86 : i486 : -march=i486 ;
+cpu-flags clang-unix OPTIONS : x86 : i586 : -march=i586 ;
+cpu-flags clang-unix OPTIONS : x86 : i686 : -march=i686 ;
+cpu-flags clang-unix OPTIONS : x86 : pentium : -march=pentium ;
+cpu-flags clang-unix OPTIONS : x86 : pentium-mmx : -march=pentium-mmx ;
+cpu-flags clang-unix OPTIONS : x86 : pentiumpro : -march=pentiumpro ;
+cpu-flags clang-unix OPTIONS : x86 : pentium2 : -march=pentium2 ;
+cpu-flags clang-unix OPTIONS : x86 : pentium3 : -march=pentium3 ;
+cpu-flags clang-unix OPTIONS : x86 : pentium3m : -march=pentium3m ;
+cpu-flags clang-unix OPTIONS : x86 : pentium-m : -march=pentium-m ;
+cpu-flags clang-unix OPTIONS : x86 : pentium4 : -march=pentium4 ;
+cpu-flags clang-unix OPTIONS : x86 : pentium4m : -march=pentium4m ;
+cpu-flags clang-unix OPTIONS : x86 : prescott : -march=prescott ;
+cpu-flags clang-unix OPTIONS : x86 : nocona : -march=nocona ;
+cpu-flags clang-unix OPTIONS : x86 : core2 : -march=core2 ;
+cpu-flags clang-unix OPTIONS : x86 : k6 : -march=k6 ;
+cpu-flags clang-unix OPTIONS : x86 : k6-2 : -march=k6-2 ;
+cpu-flags clang-unix OPTIONS : x86 : k6-3 : -march=k6-3 ;
+cpu-flags clang-unix OPTIONS : x86 : athlon : -march=athlon ;
+cpu-flags clang-unix OPTIONS : x86 : athlon-tbird : -march=athlon-tbird ;
+cpu-flags clang-unix OPTIONS : x86 : athlon-4 : -march=athlon-4 ;
+cpu-flags clang-unix OPTIONS : x86 : athlon-xp : -march=athlon-xp ;
+cpu-flags clang-unix OPTIONS : x86 : athlon-mp : -march=athlon-mp ;
+##
+cpu-flags clang-unix OPTIONS : x86 : k8 : -march=k8 ;
+cpu-flags clang-unix OPTIONS : x86 : opteron : -march=opteron ;
+cpu-flags clang-unix OPTIONS : x86 : athlon64 : -march=athlon64 ;
+cpu-flags clang-unix OPTIONS : x86 : athlon-fx : -march=athlon-fx ;
+cpu-flags clang-unix OPTIONS : x86 : winchip-c6 : -march=winchip-c6 ;
+cpu-flags clang-unix OPTIONS : x86 : winchip2 : -march=winchip2 ;
+cpu-flags clang-unix OPTIONS : x86 : c3 : -march=c3 ;
+cpu-flags clang-unix OPTIONS : x86 : c3-2 : -march=c3-2 ;
+
diff --git a/v2/tools/clang.jam b/v2/tools/clang.jam
new file mode 100644
index 000000000..818ba8778
--- /dev/null
+++ b/v2/tools/clang.jam
@@ -0,0 +1,27 @@
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt
+# or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+# This is a generic 'clang' toolset. Depending on the current system, it
+# forwards either to 'clang-unix' or 'clang-darwin' modules.
+
+import feature ;
+import os ;
+import toolset ;
+
+feature.extend toolset : clang ;
+feature.subfeature toolset clang : platform : : propagated link-incompatible ;
+
+rule init ( * : * )
+{
+    if [ os.name ] = MACOSX
+    {
+        toolset.using clang-darwin : 
+          $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ;
+    }
+    else
+    {
+        toolset.using clang-unix : 
+          $(1) : $(2) : $(3) : $(4) : $(5) : $(6) : $(7) : $(8) : $(9) ;
+    }
+}
diff --git a/v2/tools/common.jam b/v2/tools/common.jam
index 05cd392d2..f56b9d00e 100644
--- a/v2/tools/common.jam
+++ b/v2/tools/common.jam
@@ -825,6 +825,8 @@ local rule toolset-tag ( name : type ? : property-set )
     switch [ $(property-set).get <toolset> ]
     {
         case borland* : tag += bcb ;
+        case clang-unix* : tag += gcc ;
+        case clang-darwin* : tag += xgcc ;
         case como* : tag += como ;
         case cw : tag += cw ;
         case darwin* : tag += xgcc ;