Hi,<br />I noticed that there is some limited support for building objective-c code, but it doesn&#39;t seem like there is an appropriate scanner for the header dependencies of #import lines.<br /><br />I added the following code to builtin.jam, which is just a copy of the c-scanner but replacing the code to match &quot;include&quot; with the code to match &quot;import<br /><br />I also added register and set-scanner lines.<br /><br />I don&#39;t claim to be a Jam expert, so maybe someone can look over this, add some tests, and check it in.<br /><br />Chris<br /><br />class m-scanner : scanner<br />{<br />    import path ;<br />    import regex ;<br />    import scanner ;<br />    import sequence ;<br />    import virtual-target ;<br /><br />    rule __init__ ( includes * )<br />    {<br />        scanner.__init__ ;<br /><br />        for local i in $(includes)<br />        {<br />            self.includes += [ sequence.transform path.native<br />                                : [ regex.split $(i:G=) &quot;&&&quot; ] ] ;<br />        }<br />    }<br /><br />    rule pattern ( )<br />    {<br />        return &quot;#[ \t]*import[ ]*(&lt;(.*)&gt;|\&quot;(.*)\&quot;)&quot; ;<br />    }<br /><br />    rule process ( target : matches * : binding )<br />    {<br />        local angle  = [ regex.transform $(matches) : &quot;&lt;(.*)&gt;&quot;   ] ;<br />        local quoted = [ regex.transform $(matches) : &quot;\&quot;(.*)\&quot;&quot; ] ;<br /><br />        # CONSIDER: the new scoping rule seem to defeat &quot;on target&quot; variables.<br />        local g = [ on $(target) return $(HDRGRIST) ] ;<br />        local b = [ NORMALIZE_PATH $(binding:D) ] ;<br /><br />        # Attach binding of including file to included targets. When a target is<br />        # directly created from virtual target this extra information is<br />        # unnecessary. But in other cases, it allows us to distinguish between<br />        # two headers of the same name included from different places. We do not<br />        # need this extra information for angle includes, since they should not<br />        # depend on including file (we can not get literal &quot;.&quot; in include path).<br />        local g2 = $(g)&quot;#&quot;$(b) ;<br /><br />        angle = $(angle:G=$(g)) ;<br />        quoted = $(quoted:G=$(g2)) ;<br /><br />        local all = $(angle) $(quoted) ;<br /><br />        INCLUDES $(target) : $(all) ;<br />        NOCARE $(all) ;<br />        SEARCH on $(angle) = $(self.includes:G=) ;<br />        SEARCH on $(quoted) = $(b) $(self.includes:G=) ;<br /><br />        # Just propagate the current scanner to includes in hope that includes<br />        # do not change scanners.<br />        scanner.propagate $(__name__) : $(angle) $(quoted) : $(target) ;<br /><br />        ISFILE $(angle) $(quoted) ;<br />    }<br />}<br /><br />scanner.register m-scanner : include ;<br /><br />type.set-scanner OBJECTIVE_C   : m-scanner ;<br />type.set-scanner OBJECTIVE_CPP  : m-scanner ;<br />type.set-scanner OBJECTIVE_C   : c-scanner ;<br />type.set-scanner OBJECTIVE_CPP  : c-scanner ;