[PATCH 1/4] maint: no Autoconf 2.72

[Paul Eggert]

Rewrite commentary to not mention Autoconf 2.72, as the plan is to
jump from 2.71 to 2.73 with no 2.72.  Leave code uses of
‘m4_version_prereq([2.72], ...)’ alone, though as they’re still
correct for Autoconf released versions and will help test Autoconf
release candidates.
---
 ChangeLog       | 6 +++---
 m4/largefile.m4 | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 7a17b548ce..30aafccaed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5495,7 +5495,7 @@
 
        stdbool: port to C23
        * m4/stdbool.m4 (AC_CHECK_HEADER_STDBOOL): Copy from bleeding-edge
-       Autoconf.  Don’t define if Autoconf 2.72 or later.
+       Autoconf.  Define only if Autoconf 2.71 and earlier.
        * tests/test-stdbool.c (bool, false, true)
        (__bool_true_false_are_defined): Do not require these to be
        defined.  C23 still requires __bool_true_false_are_defined but
@@ -5674,11 +5674,11 @@
 
 2022-08-09  Paul Eggert  <eggert@cs.ucla.edu>
 
-       largefile, year2038: simplify if Autoconf 2.72
+       largefile, year2038: simplify if > Autoconf 2.71
        * m4/largefile.m4 (gl_SET_LARGEFILE_SOURCE)
        (_AC_SYS_LARGEFILE_MACRO_VALUE):
        * m4/year2038.m4 (gl_YEAR2038_EARLY, gl_YEAR2038, gl_YEAR2038_BODY):
-       Adjust to Autoconf 2.72, which should contain the Gnulib
+       Adjust to Autoconf versions after 2.71, which should contain the Gnulib
        patches in this area and so should not need to be overridden.
 
 2022-08-07  Bruno Haible  <bruno@clisp.org>
diff --git a/m4/largefile.m4 b/m4/largefile.m4
index 7fb81b864a..b128e24353 100644
--- a/m4/largefile.m4
+++ b/m4/largefile.m4
@@ -10,7 +10,7 @@
 # It does not set _LARGEFILE_SOURCE=1 on HP-UX/ia64 32-bit, although this
 # setting of _LARGEFILE_SOURCE is needed so that <stdio.h> declares fseeko
 # and ftello in C++ mode as well.
-# Fixed in Autoconf 2.72, which has AC_SYS_YEAR2038.
+# This problem occurs in Autoconf 2.71 and earlier, which lack AC_SYS_YEAR2038.
 AC_DEFUN([gl_SET_LARGEFILE_SOURCE],
  m4_ifndef([AC_SYS_YEAR2038], [[
   AC_REQUIRE([AC_CANONICAL_HOST])
-- 
2.37.2