Re: Selecting between directories?

[Alexandre Duret-Lutz]

>>> "Cedric" == Cedric Vandenbergh <address@hidden> writes:

 Cedric> Hi all,
 Cedric> I've looked through the documentation but can't work this out.

Which Automake version?

The 1.7+ manual has a more detailed section about conditional
subdirectories.
http://sources.redhat.com/automake/automake.html#Top%20level

I'm not sure that applies in your case, though.

[...]

 Cedric> Subdir3 & subdir4 are ALWAYS present, while EITHER
 Cedric> subdir1 OR subdir2 is present [depending on release].

Could you explain what `depending on release' means?
In particular, how do you choose MY_PROJECT_DIR?

If MY_PROJECT_DIR is not know statically (i.e., when Autoconf is
run), I don't know what you can do.

[...]

 Cedric> MY_PROJECT_DIR=sub1
 Cedric> AC_SUBST(MY_PROJECT_DIR)
 Cedric> AC_OUTPUT(
 Cedric> Makefile
 Cedric> specific/Makefile
 Cedric> specific/${MY_PROJECT_DIR}/Makefile
 Cedric> common/Makefile
 Cedric> common/Makefile/subdir3
 Cedric> common/Makefile/subdir4
 Cedric> )

 Cedric> in top/configure.in

 Cedric> Automake completes, but doesn't generate
 Cedric> "specific/sub1/Makefile.in" which eventually causes
 Cedric> "./configure" to fail.

Automake tries process the files listed in AC_OUTPUT, but it
knows nothing about the value of the shell variable
$MY_PROJECT_DIR.

Starting with Automake 1.7, I think it will work if you use an
m4 macro for this.  Something along the lines of

  m4_define([MY_PROJECT_DIR_VALUE], [sub1])
  AC_SUBST([MY_PROJECT_DIR], [MY_PROJECT_DIR_VALUE])
  AC_OUTPUT([Makefile
             specific/Makefile
             specific/MY_PROJECT_DIR_VALUE/Makefile
             common/Makefile
             common/Makefile/subdir3
             common/Makefile/subdir4
            ])

-- 
Alexandre Duret-Lutz