general: deprecate 'configure.in' as autoconf input

It has been years since that has been deprecated in the documentation,
in favour of 'configure.ac':

  Previous versions of Autoconf promoted the name configure.in, which
  is somewhat ambiguous (the tool needed to process this file is not
  described by its extension), and introduces a slight confusion with
  config.h.in and so on (for which '.in' means "to be processed by
  configure"). Using configure.ac is now preferred.

It's now time to start giving runtime warning about the use of
'configure.in', so that support for it can be removed in future
versions of autoconf/automake.

* lib/Autom4te/Configure_ac.pm: Issue a warning in the 'obsolete'
category if 'configure.in' is detected.  Since this module is synced
from Automake, this change is to be backported there (and will be
soon).
* doc/autoconf.texi: Update.
* tests/tools.at: Adjust to avoid spurious failures.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>

1 files changed, 14 insertions, 14 deletions

diff --git a/tests/tools.at b/tests/tools.at
index 31d4aadb..5a9ee63c 100644
--- a/tests/tools.at
+++ b/tests/tools.at
@@ -1135,7 +1135,7 @@ AT_SETUP([autoupdating with aclocal and m4@&t@_include])
 AT_CHECK([aclocal --version || exit 77], [], [ignore], [ignore])
 
 mkdir m4 aclocal
-AT_DATA([configure.in],
+AT_DATA([configure.ac],
 [[AC_INIT(x,0)
 AC_UNCHANGED_MACRO
 AC_OLD_MACRO
@@ -1169,7 +1169,7 @@ AT_CHECK([automake --version || exit 77], [], [stdout], [ignore])
 AT_CHECK([[grep '[1-9]\.[0-9]' stdout || exit 77]], [], [ignore])
 AT_CHECK([test ! -f $HOME/.autom4te.cfg || exit 77], [], [ignore], [ignore])
 
-AT_DATA([configure.in],
+AT_DATA([configure.ac],
 [[AC_INIT(GNU foo, 1.0)
 AM_INIT_AUTOMAKE
 AC_CONFIG_FILES([Makefile])
@@ -1294,9 +1294,9 @@ do
   export TMPDIR
 
   # skip if we cannot create such a file or directory
-  AT_CHECK([mkdir "$dir" "$TMPDIR" && touch "$file.in" || exit 77])
+  AT_CHECK([mkdir "$dir" "$TMPDIR" && touch "$file.ac" || exit 77])
 
-  cat >"$file.in" <<'END'
+  cat >"$file.ac" <<'END'
 [AC_INIT(x,0)
 m4@&t@_include([foo.m4])
 AC_CONFIG_HEADERS([config.h:config.hin])
@@ -1307,20 +1307,20 @@ END
 [AC_DEFUN([AC_MACRO], [echo hi])]
 END
 
-  AT_CHECK_AUTOHEADER([-B "$dir" "$file.in"])
-  AT_CHECK_AUTOHEADER([--force -I "$dir" "$file.in"])
-  AT_CHECK_AUTOUPDATE([-B "$dir" "$file.in"])
-  AT_CHECK_AUTOUPDATE([--force -I "$dir" "$file.in"])
-  AT_CHECK_AUTOUPDATE([-B "$dir" - < "$file.in"], [], [ignore])
-  AT_CHECK_AUTOCONF([-B "$dir" -o "$file" "$file.in"])
-  AT_CHECK_AUTOCONF([-I "$dir" -o "$file" "$file.in"])
+  AT_CHECK_AUTOHEADER([-B "$dir" "$file.ac"])
+  AT_CHECK_AUTOHEADER([--force -I "$dir" "$file.ac"])
+  AT_CHECK_AUTOUPDATE([-B "$dir" "$file.ac"])
+  AT_CHECK_AUTOUPDATE([--force -I "$dir" "$file.ac"])
+  AT_CHECK_AUTOUPDATE([-B "$dir" - < "$file.ac"], [], [ignore])
+  AT_CHECK_AUTOCONF([-B "$dir" -o "$file" "$file.ac"])
+  AT_CHECK_AUTOCONF([-I "$dir" -o "$file" "$file.ac"])
   # In autoconf, these exercise a slightly different code path:
-  AT_CHECK_AUTOCONF([--prepend-include="$dir" -o "$file" "$file.in"])
-  AT_CHECK_AUTOCONF([--include="$dir" -o "$file" "$file.in"])
+  AT_CHECK_AUTOCONF([--prepend-include="$dir" -o "$file" "$file.ac"])
+  AT_CHECK_AUTOCONF([--include="$dir" -o "$file" "$file.ac"])
   AT_CHECK([autoscan -B "$dir"], [], [], [ignore])
   AT_CHECK([autoscan --force -I "$dir"], [], [], [ignore])
   # autoreconf requires a sane input file name.  Also, disable aclocal.
-  mv -f "$file.in" configure.in
+  mv -f "$file.ac" configure.ac
   AT_DATA([aclocal.m4])
   AT_CHECK([autoreconf -B "$dir"])
   AT_CHECK([autoreconf --force -I "$dir"])