Re: Enable top-level recursive 'autoreconf'

[Alexandre Oliva <oliva@adacore.com>]

On Oct 19, 2023, Thomas Schwinge <thomas@codesourcery.com> wrote:

> On 2023-10-18T15:42:18+0100, R jd <3246251196ryan@gmail.com> wrote:
>> I guess I can ask, why there is not a recursive approach for configuring
>> GCC. e.g. AC_SUBDIRS in the top level?

> ('AC_CONFIG_SUBDIRS' you mean.)  You know, often it just takes someone to
> ask the right questions...  ;-)

> What do people think about the attached
> "Enable top-level recursive 'autoreconf'"?  Only lightly tested, so far.

Interesting idea!

It is a little hackish, in that it seems to exploit an implementation
detail in AC_CONFIG_SUBDIRS rather than a documented feature.

I like it!

The autoconf documentation suggests that optional directories can be
tested for:

  if test -d "$srcdir/foo"; then
    AC_CONFIG_SUBDIRS([foo])
  fi

We could use a macro that takes a list and iterates over the list (untested):

dnl Handle a list of optional subdirs.
dnl After AC_OUTPUT, affects autoreconf runs, but not configure runs.
AC_DEFUN([AC_CONFIG_SUBDIRS_OPT], [
  m4_foreach_w([dir], [$1], [
    if test -d "$srcdir/dir"; then
      AC_CONFIG_SUBDIRS(dir)
    fi
  ])
])

Thanks,

-- 
Alexandre Oliva, happy hacker            https://FSFLA.org/blogs/lxo/
   Free Software Activist                   GNU Toolchain Engineer
More tolerance and less prejudice are key for inclusion and diversity
Excluding neuro-others for not behaving ""normal"" is *not* inclusive