Roland Ver. 4.5 Información técnica descargar pdf (Pagina 124)

114 GNU make

cc -c x.c -o x.o

cc -c y.c -o y.o

cc -c z.c -o z.o

cc x.o y.o z.o -o x

rm -f x.o

rm -f y.o

rm -f z.o

In more complicated cases, such as when there is no object ﬁle whose name

derives from the executable ﬁle name, you must write an explicit recipe for

linking.

Each kind of ﬁle automatically made into ‘.o’ object ﬁles will be automatically

linked by using the compiler (‘$(CC)’, ‘$(FC)’ or ‘$(PC)’; the C compiler ‘$(CC)’

is used to assemble ‘.s’ ﬁles) without the ‘-c’ option. This could be done by

using the ‘.o’ object ﬁles as intermediates, but it is faster to do the compiling

and linking in one step, so that’s how it’s done.

Yacc for C programs

n.c is made automatically from n.y by running Yacc with the recipe ‘$(YACC)

$(YFLAGS)’.

Lex for C programs

n.c is made automatically from n.l by running Lex. The actual recipe is

‘$(LEX) $(LFLAGS)’.

Lex for Ratfor programs

n.r is made automatically from n.l by running Lex. The actual recipe is

‘$(LEX) $(LFLAGS)’.

The convention of using the same suﬃx ‘.l’ for all Lex ﬁles regardless of whether

they produce C code or Ratfor code makes it impossible for make to determine

automatically which of the two languages you are using in any particular case. If

make is called upon to remake an object ﬁle from a ‘.l’ ﬁle, it must guess which

compiler to use. It will guess the C compiler, because that is more common.

If you are using Ratfor, make sure make knows this by mentioning n.r in the

makeﬁle. Or, if you are using Ratfor exclusively, with no C ﬁles, remove ‘.c’

from the list of implicit rule suﬃxes with:

.SUFFIXES:

.SUFFIXES: .o .r .f .l ...

Making Lint Libraries from C, Yacc, or Lex programs

n.ln is made from n.c by running lint. The precise recipe is

‘$(LINT) $(LINTFLAGS) $(CPPFLAGS) -i’. The same recipe is used on the C

code produced from n.y or n.l.

X and Web

n.dvi is made from n.tex with the recipe ‘$(TEX)’. n.tex is made from n.web

with ‘$(WEAVE)’, or from n.w (and from n.ch if it exists or can be made) with

‘$(CWEAVE)’. n.p is made from n.web with ‘$(TANGLE)’ and n.c is made from

n.w (and from n.ch if it exists or can be made) with ‘$(CTANGLE)’.

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Roland Ver. 4.5 Información técnica Pagina 124

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