Re: AC_CONFIG_SUBDIRS and subdirs

[Akim Demaille]

>>>>> "Ralf" == Ralf Corsepius <address@hidden> writes:

Ralf> Hi, I think, we've had this issue, before ;):

:)

Ralf> Alternatively, it should be clearly documented that that
Ralf> AC_CONFIG_SUBDIRS does not support conditionally present subdirs
Ralf> and users are supposed to check for presence of directories
Ralf> themselves.  (Which, IMHO, would contradict the intention of
Ralf> current autoconf's documentation on AC_CONFIG_SUBDIRS).

Well, maybe the doc ought to be adjusted, nevertheless, I think this
is the correct feature.  Being able to detect an error seems better to
me.  In addition, this is consistent with all the other AC_CONFIG.

So I don't plan to change this.  Please, help us improve the doc, but
if foo is optional, then the correct directives are

if test -f foo.in; then
  AC_CONFIG_FILES(foo)
fi

and

if test -d foo; then
  AC_CONFIG_SUBDIRS(foo)
fi