#  (C) Copyright David Abrahams 2001. Permission to copy, use, modify, sell and
#  distribute this software is granted provided this copyright notice appears in
#  all copies. This software is provided "as is" without express or implied
#  warranty, and with no claim as to its suitability for any purpose.

# First of all, check the jam version

if $(JAM_VERSION:J="") < 030103
{
    ECHO "error: Boost.Jam version 3.1.3 or later required" ;
    EXIT ;
} 

# Bootstrap the module system. And bring the import rule into the global module.
#
SEARCH on <module@>modules.jam = $(BOOST_BUILD_PATH) ;
module modules { include <module@>modules.jam ; }
IMPORT modules : import : : import ;

# Reload the modules, to clean up things. The modules module can tolerate
# being included twice.
#
import modules ;

# Check to see if the user is asking for help as soon as possible.
# This is first action, so that we can interrupt the regular build
# process if they are asking for help.
#
import doc ;
if ! [ doc.help ]
{
    # No help requested, go ahead and load and build the users
    # project.
    
    # Allow users to override the build system file from the
    # command-line (mostly for testing)
    local build-system = [ MATCH --build-system=(.*) : $(ARGV) ] ;
    build-system ?= build-system ;
    
    # Use last element in case of multiple command-line options
    import $(build-system[-2]) ;
}