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<TITLE>A Makefile</TITLE>
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<H2><A NAME="SECTION00082000000000000000"> </A>
<A NAME="makefile"> </A>
<BR>
A Makefile
</H2>
For the sake of convenience, we give here a typical <I>makefile</I>
for use with the term
processor, <I>yacc</I> and <I>lex</I>.
This example illustrates a naming convention: the input files are called
<I>file1.k</I> and <I>file2.k</I>, all user-provided C code is in the file <I>examplemain.c</I>,
the <I>yacc</I> input is in <I>exampley.y</I>, and the <I>lex</I> input is in
<I>examplel.l</I>.
Note that the makefile makes extensive use of <I>make</I>'s defaults,
and that it attempts to
avoid superfluous recompilations.
<A NAME="1002"> </A>
<PRE><HR><!--lgrindfile: makefile.make 14:14 Oct 27 1992-->
<I># /* Makefile for the term processor */
</I><I># /* 2 input .k-files plus yacc and lex usage. */
</I>IT = example
KFILES = file1.k file2.k
YOURFILES = ${KFILES} ${IT}y.y ${IT}l.l ${IT}main.c
ALLOBJS = k.o rk.o csgiok.o unpk.o\
${KFILES:k=o} ${IT}y.o ${IT}l.o ${IT}main.o
GENERATED_BY_KC = k.c rk.c csgiok.c unpk.c ${KFILES:k=c}\
k.h rk.h csgiok.h unpk.h ${KFILES:k=h}
YFLAGS = -d
<BR>
${IT}: ${ALLOBJS}
${CC} ${CFLAGS} ${ALLOBJS} -ll -o $@
<BR>
${GENERATED_BY_KC}: kctimestamp
<BR>
kctimestamp: ${KFILES}
kc ${KFILES}; touch kctimestamp
<BR>
${ALLOBJS}: k.h
${IT}main.o ${IT}l.o: x.tab.h
${IT}main.o ${KFILES:k=o}: ${KFILES:k=h}
${IT}main.o rk.o: rk.h
${IT}main.o csgiok.o: csgiok.h
${IT}main.o unpk.o: unpk.h
<BR>
<I># /* making copies to prevent unnecessary recompilation after yacc run */
</I>x.tab.h: y.tab.h
-cmp -s x.tab.h y.tab.h || cp y.tab.h x.tab.h
<BR>
<I># /* if you clean up, don't forget to remove the file kctimestamp */
</I>
<HR></PRE>
This makefile is rather complicated, for the following reason.
The target (<I>${IT}</I>) depends on a number of object files, which depend
on a number of <I>.c</I> and <I>.h</I> files, some of which depend on the <I>.k</I> files.
However, if <I>example.k</I> is changed the term processor does not always change
all <I>.c</I> and <I>.h</I> files, and
we want to avoid recompilations of unchanged files.
For this reason, an intermediate target <I>kctimestamp</I> is introduced that `remembers'
when <I>kc</I> was last executed successfully.
<P>
The last rule (for <I>x.tab.h</I>) helps to avoid recompilations when <I>yacc</I>
overwrites the file <I>y.tab.h</I> but doesn't change it.
<P>
There is still a problem with this makefile.
It assumes that if <I>kctimestamp</I> is up to date the generated
files are also accurate.
The user can mess this up.
<P>
How to adapt this to your situation?
If you have a different number of <I>.k</I> files, you will have to adapt the definition of the <I>KFILES</I> macro.
If you do not use <I>yacc</I> you can remove the lines containing <I>x.tab.h</I> (2 lines)
and the filenames
<I>${IT}y.[yo]</I>.
If you do not use <I>lex</I> you can remove the filenames <I>${IT}l.[lo]</I> and the
loader option <I>-ll</I>.
In either case it is sufficient to remove the object file names
from the definition of the macro <I>ALLOBJS</I>.
This is also true for other files that need not be included in the final program.
For example, if no rewriting functions are used you can delete <I>rk.o</I> from <I>ALLOBJS</I>
and it will not be compiled.
<P>
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<BR><I>2000-04-17</I>
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