Index: tools/build/v2/tools/gcc.jam
===================================================================
RCS file: /cvsroot/boost/boost/tools/build/v2/tools/gcc.jam,v
retrieving revision 1.57
diff -u -r1.57 gcc.jam
--- tools/build/v2/tools/gcc.jam	21 Sep 2005 13:44:06 -0000	1.57
+++ tools/build/v2/tools/gcc.jam	20 Nov 2005 18:29:57 -0000
@@ -15,7 +15,9 @@
 import "class" : new ;
 import set ;
 import common ;
+
 import errors ;
+import pch ;
 
 feature.extend toolset : gcc ;
 
@@ -68,6 +70,8 @@
 generators.register-c-compiler gcc.compile.c : C : OBJ : <toolset>gcc ;
 generators.register-c-compiler gcc.compile.asm : ASM : OBJ : <toolset>gcc ;
 
+generators.register
+  [ new pch-generator gcc.compile.pch : HPP : PCH : <toolset>gcc ] ;
 
 # Declare flags and action for compilation
 flags gcc.compile OPTIONS <optimization>off : -O0 ;
@@ -124,7 +128,11 @@
 flags gcc.compile DEFINES <define> ;
 flags gcc.compile INCLUDES <include> ;
 
-rule compile.c++
+flags gcc.compile PCH_SOURCE <pch-source> ;
+flags gcc.compile PCH_HEADER <pch>on : <pch-header> ;
+flags gcc.compile PCH_FILE <pch>on : <pch-file> ;
+
+rule compile.c++ ( targets + : sources * : properties * )
 {
     # Some extensions are compiled as C++ by default. For others, we need
     # to pass -x c++.
@@ -132,16 +140,37 @@
     if ! $(>:S) in .cc .cp .cxx .cpp .c++ .C
     {
         LANG on $(<) = "-x c++" ;
-    }    
+    }
+    DEPENDS $(<) : [ on $(<) return $(PCH_HEADER) ] ;
+    DEPENDS $(<) : [ on $(<) return $(PCH_FILE) ] ;
 }
 
 
-actions compile.c++
+actions compile.c++ bind PCH_HEADER PCH_FILE
 {
-    "$(CONFIG_COMMAND)" $(LANG) -ftemplate-depth-100 $(OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)" 
+    "$(CONFIG_COMMAND)" $(LANG) -include"$(PCH_FILE:W)"  -ftemplate-depth-100 $(OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)" 
 }
 
-rule compile.c
+rule compile.pch ( 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 $(PCH_HEADER) ] ;
+}
+
+actions compile.pch bind PCH_SOURCE
+{
+    "$(CONFIG_COMMAND)" $(LANG) -x c++-header $(OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -c -o "$(<)" "$(>)" 
+}
+
+
+rule compile.c ( targets + : sources * : properties * )
 {
     # If we use the name g++ then default file suffix -> language mapping
     # does not work. So have to pass -x option. Maybe, we can work around this
@@ -150,6 +179,10 @@
     #{
         LANG on $(<) = "-x c" ;
     #}    
+
+    DEPENDS $(<) : [ on $(<) return $(PCH_HEADER) ] ;
+    DEPENDS $(<) : [ on $(<) return $(PCH_FILE) ] ;
+
 }