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##xxxxxxxxxxxxxxxxxxxxxx --*- Makefile -*-- xxxxxxxxxxxxxxxx>>> config.make
## By default, make will jump into any sub directory that contains a file
## named "Makefile". This is done in the order implied by "/bin/ls" which
## is in almost all cases correct (note that you should not design
## Makefiles which depend on a specific invocation order). You can override
## specific behaviour by using variable SUBDIRS. If given and not empty,
## "/bin/ls" is not used. Also, if you want to disable jumping subdirs you
## may use either ".", ".." as value for SUBDIRS. Note that SUBDIRS may
## contain any directory (except "." and "..).
## This is very much GNU specific, sigh. Variable SUBDIRS is used to tell
## make which subdirectory to jump. It's value is normally preset or just
## empty, in which case /bin/ls is used as discussed above. However, I also
## want that a user can say
##
## make SUBDIRS="d1 d2 .. dn"
##
## That means, ignore defaults and go ahead and make exactly this director-
## ies mentioned. Of course, this should only have an impact on Makefile
## being used by "make" but not for any makefils in d1 .. dn, right? For
## example, if di needs to make directories a,b and c, then they need to
## be made of course. So all burns down to the question how to prevent a
## variable from being passed to submakes. Below you can see the answer. If
## you believe that there's a simpler answer to the problem don't hesistate
## to try it out. If it works, send me an email: ora dot et dot labora at
## web dot de. But be warned - you need to try all variations.
##
## Here is in short what I found and how it works. Variables given on
## command line are saved in variable MAKEOVERRIDES. This variable is
## exported and passed down. On invocation of a submake file, make will
## have a look into MAKEOVERRIDES and unpack each variable found therein.
## Therefore I'm just going to remove every (?) occurance of SUBDIRS from
## this variable.
MAKEOVERRIDES := $(patsubst SUBDIRS=%,,$(MAKEOVERRIDES))
## The actuall rule on how to make a recursive target.
all clean distclean test install force-target clean-target ::
@dirs="$(SUBDIRS)" ; \
test -z "$${dirs}" && { \
dirs=`/bin/ls` ; \
} ; \
for d in . $${dirs} ; do \
case $${d} in \
. | .. ) ;; \
$(SUBDIRS_NOT) ) ;; \
*) \
if test -f "$${d}/Makefile" ; then \
echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>" ; \
echo ">> @MAKE@ -C $(subdir)/$${d} $@ " ; \
echo ">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>" ; \
@MAKE@ -C "$$d" $@ || exit 1 ;\
fi ; \
;; \
esac ; \
done
## For historical reasons only you can make local targets as "this-*" or
## "*-this" rules. The default is to do nothing. Although this targets
## exists, it is recommended to define further "all", "clean" etc. double
## colon rules.
all :: this-all all-this
clean :: this-clean clean-this
distclean :: this-distclean distclean-this
test :: this-test test-this
install :: this-install install-this
this-all ::
this-clean ::
this-distclean ::
this-test ::
this-install ::
all-this ::
clean-this ::
distclean-this ::
test-this ::
install-this ::
force-target :: clean-target all
distclean :: clean
distclean ::
$(RM) Makefile
## xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx<< config.make
|
