When you say: XXX target.t : source.s ;

you are invoking rule XXX with arguments target.t and source.s Since there isn't a definition of rule XXX in your Jamfile, it gives the message.

dave

> From: Jack Andrews <jack...@str.com.au> > Date: Fri, 26 Feb 1999 11:41:40 +1100 > MIME-Version: 1.0 > X-Mailer: Internet Mail Service (5.5.1960.3) > Content-Type: text/plain > Precedence: list > Errors-To: list...@perforce.com > X-Sequence: 656 > > Why do I get this message: > > > Compiler is Microsoft Visual C++ > warning: unknown rule XXX > ...found 7 target(s)... > > > when I run jam in the directory that this Jamfile (i created) exists in: > > > XXX target.t : source.s ; > > rule UserObject > { > switch $(>) > { > case *.s : SourceCompiler $(<) : $(>) ; > case * : ECHO "unknown suffix on" $(>) ; > } > } > > rule SourceCompiler > { > DEPENDS $(<) : $(>) ; > Clean clean : $(<) ; > } > > > actions SourceCompiler > { > copy $(>) $(<) > }