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>Writing a make-rule to generate dependency information</TITLE
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>Chapter 3. Writing a make-rule to generate dependency information</A
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><P
>In general it is much more convenient to let your makefiles
generate their own dependency information instead of doing it by hand
as described in the previous chapter.</P
><P
>Let's say we have a variable in our makefile that lists all
source files, <TT
CLASS="VARNAME"
>SOURCES</TT
>. We also want
to save dependency information to a file named <TT
CLASS="FILENAME"
>.depend</TT
>.
Here is how to write a make rule to accomplish just that.</P
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><B
>Example 3-1. Makefile fragment to generate dependencies from
a number of sources</B
></P
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>.depend:
fastdep $(SOURCES) > .depend
-include .depend
</PRE
></DIV
><P
>It adds a new target <TT
CLASS="FILENAME"
>.depend</TT
>,
which is file to hold the dependency information generated by fastdep
for all files listed in <TT
CLASS="VARNAME"
>SOURCES</TT
>. The fragment
also includes this file in the Makefile itself when it exist. If not
make will generate it first (using the rule
we specified), restart itself and include it next.</P
><P
>Now each time we want to regenerate dependencies, all we
have to do is delete the <TT
CLASS="FILENAME"
>.depend</TT
> file and launch
make.</P
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