+\layout Subsection
+
+VPATH
+\begin_inset LatexCommand \index{VPATH}
+
+\end_inset
+
+ feature
+\layout Standard
+
+SDCC supports the VPATH feature provided by configure and make.
+ It allows to separate the source and build trees.
+ Here's an example:
+\layout Standard
+
+
+\family typewriter
+cd ~\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+# cd $HOME
+\layout Standard
+
+
+\family typewriter
+tar -xzf sdcc.src.tar.gz\SpecialChar ~
+# extract source to directory sdcc
+\layout Standard
+
+
+\family typewriter
+mkdir sdcc.build\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+# put output in sdcc.build
+\layout Standard
+
+
+\family typewriter
+cd sdcc.build
+\layout Standard
+
+
+\family typewriter
+../sdcc/configure\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+\SpecialChar ~
+# configure is doing all the magic!
+\layout Standard
+
+
+\family typewriter
+make
+\layout Standard
+\noindent
+That's it!
+\series bold
+configure
+\series default
+ will create the directory tree will all the necessary Makefiles in ~/sdcc.build.
+ It automagically computes the variables srcdir, top_srcdir and top_buildir
+ for each directory.
+ After running
+\series bold
+make
+\series default
+ the generated files will be in ~/sdcc.build, while the source files stay
+ in ~/sdcc.
+\newline
+This is not only usefull for building different binaries, e.g.
+ when cross compiling.
+ It also gives you a much better overview in the source tree when all the
+ generated files are not scattered between the source files.
+ And the best thing is: if you want to change a file you can leave the original
+ file untouched in the source directory.
+ Simply copy it to the build directory, edit it, enter `make clean`, `rm
+ Makefile.dep` and `make`.
+
+\series bold
+make
+\series default
+ will do the rest for you!