Spoke to volodya about this; these changes add support for bootstrapping the

Boost.Build system with clang. I also fixed a few things in the clang-linux
toolchain;

  - Clang doesn't support -pg.
  - Adding -O0 to turn optimization off is silly, because it is set to zero by
    default if omitted on the command line. The compiler will whine about
    unused options if you later add another -O flag. The Boost.Build UTF
    interface adds a second -O0, so you end up with two redundant command line
    options and a warning from bjam/clang for every invocation of the compiler
    when using the test framework.



[SVN r66441]

v2/bootstrap.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 # Copyright (C) 2005, 2006 Douglas Gregor.
 # Copyright (C) 2006 The Trustees of Indiana University
+# Copyright (C) 2010 Bryce Lelbach 
 #
 # 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)
@@ -68,6 +69,10 @@ if test "x$TOOLSET" = x; then
     TOOLSET=gcc
     ;;
     
+    clang* )
+    TOOLSET=clang
+    ;;
+
     sun* )
     TOOLSET=sun
     ;;
@@ -78,6 +83,13 @@ if test "x$TOOLSET" = x; then
   esac
 fi
 
+case $TOOLSET in 
+  clang*)
+  TOOLSET=clang
+  ;;
+esac
+
+
 rm -f config.log
 
 # Build bjam
@@ -104,4 +116,4 @@ Bootstrapping is done. To build and install, run:
 
     ./bjam install --prefix=<DIR>
 
-EOF
+EOF

v2/engine/src/build.jam

@@ -193,6 +193,14 @@ toolset como como : "-o " : -D
     [ opt --debug : --no_inlining ]
     -I$(--python-include) -I$(--extra-include)
     : -L$(--python-lib[1]) -l$(--python-lib[2]) ;
+## Clang Linux 2.8+
+toolset clang clang :  "-o " : -D
+    : -Wno-unused -Wno-format
+    [ opt --release : -Os ]
+    [ opt --debug : -g -O0 -fno-inline ]
+    [ opt --profile : -finline-functions -g ]
+    -I$(--python-include) -I$(--extra-include)
+    : -L$(--python-lib[1]) -l$(--python-lib[2]) ;
 ## MacOSX Darwin, using GCC 2.9.x, 3.x
 toolset darwin cc :  "-o " : -D
     :

v2/engine/src/build.sh

@@ -208,6 +208,11 @@ case $BOOST_JAM_TOOLSET in
     BOOST_JAM_CC=cc
     ;;
 
+    clang*)
+    BOOST_JAM_CC="clang -Wno-unused -Wno-format"
+    BOOST_JAM_TOOLSET=clang
+    ;;
+
     tru64cxx)
     BOOST_JAM_CC=cc
     ;;

v2/engine/src/modules/order.c

@@ -50,8 +50,8 @@ void do_ts(int** graph, int current_vertex, int* colors, int** result_ptr)
 
         if (colors[adjacent_vertex] == white)
             do_ts(graph, adjacent_vertex, colors, result_ptr);
-        else if (colors[adjacent_vertex] == gray)
-            ; /* This is loop. Not sure what to do... */
+        //else if (colors[adjacent_vertex] == gray)
+            //; /* This is loop. Not sure what to do... */
     }
     colors[current_vertex] = black;
     **result_ptr = current_vertex;    

v2/tools/clang-linux.jam

@@ -71,7 +71,7 @@ rule init ( version ? :  command * : options * )
 SPACE = " " ;
 
 # Declare flags and action for compilation.
-toolset.flags clang-linux.compile OPTIONS <optimization>off   : -O0 ;
+toolset.flags clang-linux.compile OPTIONS <optimization>off   : ;
 toolset.flags clang-linux.compile OPTIONS <optimization>speed : -O3 ;
 toolset.flags clang-linux.compile OPTIONS <optimization>space : -Os ;
 
@@ -85,7 +85,7 @@ toolset.flags clang-linux.compile OPTIONS <warnings>all : -Wall -pedantic ;
 toolset.flags clang-linux.compile OPTIONS <warnings-as-errors>on : -Werror ;
 
 toolset.flags clang-linux.compile OPTIONS <debug-symbols>on : -g ;
-toolset.flags clang-linux.compile OPTIONS <profiling>on : -pg ;
+toolset.flags clang-linux.compile OPTIONS <profiling>on : ;
 toolset.flags clang-linux.compile OPTIONS <rtti>off : -fno-rtti ;
 
 rule compile.c++ ( targets * : sources * : properties * )