regex, threads, and python will all build from the top level. If you build the 'test' target from the top level, it will run all regressions.

Jamfile:
  subincludes for thread, python libs, and status for regression tests

Jamrules:
  Use the new path-global rule to establish BOOST_ROOT correctly for all subprojects

libs/regex/build/Jamfile
  Take advantage of correct BOOST_ROOT setting

libs/python/build/Jamfile
  Search for python executable; don't try to build anything if it can't be found.
  don't build tests by default
  improved comments, organization, and naming.

status/Jamfile
  Fixed references to config test files
  Failed tests now leave their stdout results in <testname>.error instead of removing it
  No test targets are dependencies of 'all' anymore
  Added comments
  Reorganized

tools/build/Jambase
  Meant to check this in long ago.

tools/build/allyourbase.jam
  Fixed SHELL_EXPORT setting, added SHELL_SET
  removed 'test' from the dependencies of 'all'; tests no longer run by default.
  Fixed the direction of slashes for Windows when ALL_LOCATE_TARGET is used.
  Added path-global rule for declaring path variables which may be relative
  rule in-invocation-subdir returns true if the current subproject is the one
     from which Jam was invoked
  rule protect-subdir is now used to protect subproject variables
  rule tokens-to-simple-path converts path tokens to a simplified path.

tools/build/boost-base.jam
  Fixed bugs

tools/build/jam_src/makedebugjam.bat
  Fixed a bug which prevented a final debug build

tools/build/jam_src/search.c
  Fixed a bug of mine which caused LOCATE to be ignored (!).


[SVN r11348]

build/Jamfile

@@ -5,23 +5,23 @@ SOURCES = c_regex_traits c_regex_traits_common cpp_regex_traits
        regex_synch w32_regex_traits wide_posix_api ;
        
 lib libboost_regex$(SUFLIB) : ../src/$(SOURCES).cpp 
-	: 
-		<include>../../../
-		<define>BOOST_RE_NO_LIB=1
-	: 
-		debug release
+    : 
+        <include>$(BOOST_ROOT)
+        <define>BOOST_RE_NO_LIB=1
+    : 
+        debug release
       <runtime-link>dynamic
-	;
+    ;
 
 
 dll libboost_regex$(SUFDLL[1]) : ../src/$(SOURCES).cpp 
-	: 
-		<include>../../../
-		<define>BOOST_RE_BUILD_DLL=1
-	: 
-		debug release
+    : 
+        <include>$(BOOST_ROOT)
+        <define>BOOST_RE_BUILD_DLL=1
+    : 
+        debug release
       <runtime-link>dynamic
-	;
+    ;