[R] src/modules/Makefile.in: What is the (practical) difference betw. SUBDIRS and MODULES?

[Kurt Hornik]

>>>>> Prof Brian D Ripley writes:

> On Sat, 6 Oct 2001, Thomas Hoffmann wrote:
>> As the subject says, one has
>> 
>> SUBDIRS = X11 gnome internet lapack vfonts
>> 
>> MODULES = $(R_GUIS) internet lapack vfonts
>> 
>> It is my understanding, that there is a 1:1 correspondence between
>> subdirs and modules. If this were true, then one could use one of
>> both in all places. Or do I overlook something here?

> Not all R_GUIS might be supported: gnome often is not. So there is
> on my Solaris system a gnome subdir but no gnome module.
> Your assumption of a 1:1 correspondence is incorrect for my system, which
> has

> R_GUIS = X11

> in $(top_builddir)/Makeconf.


> MODULES is used for shared libraries to be made (to be dynamically
> loaded).  SUBDIRS is used for things to be cleaned and to be
> distributed.

> One could argue that MODULES should be used for things to be cleaned,
> *BUT* that might have be changed by a re-configure, so SUBDIRS looks
> safer.

> [I'm not the author of any of this, and the choices made look right to
> me.]

Thanks :-)

In general we always use SUBDIRS for cleaning up.  We must do that
because e.g. configure could have created a Makefile in a subdir which
make distclean must remove.

[One could argue that targets that build should always use SUBDIRS too
but that can make things rather tricky.]

-k
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