arts the include
server so that throughout the build it can answer include queries
by distcc commands.<BR>
<P>
The include server uses static analysis of the macro language
to deal with conditional compilation and computed includes.  It
uses the property that when a given header file has already been
analyzed for includes, it is not necessary to do so again if all
the include options (-I's) are unchanged (along with other conditions).<BR>
<P>
For large builds, header files are included, on average, hundreds