From 215a6021df9bd82f4712cf6b0087b11599453d96 Mon Sep 17 00:00:00 2001
From: yueyuankun <yueyuankun@kylinos.cn>
Date: Tue, 26 Aug 2025 17:32:03 +0800
Subject: [PATCH] Fix timing bug on high-speed builds

---
 autoconf.spec                                 | 13 +++-
 ...-Fix-timing-bug-on-high-speed-builds.patch | 72 +++++++++++++++++++
 2 files changed, 82 insertions(+), 3 deletions(-)
 create mode 100644 backport-Fix-timing-bug-on-high-speed-builds.patch

diff --git a/autoconf.spec b/autoconf.spec
index c9222c4..29a05e4 100644
--- a/autoconf.spec
+++ b/autoconf.spec
@@ -3,7 +3,7 @@
 
 Name:           autoconf
 Version:        2.71
-Release:        9
+Release:        10
 Summary:        An extensible package to automatically configure software source code packages
 License:        GPLv2+ and GPLv3+ and GFDL-1.3-only
 URL:            https://www.gnu.org/software/%{name}/
@@ -11,8 +11,9 @@ Source0:        http://ftp.gnu.org/gnu/%{name}/%{name}-%{version}.tar.xz
 Source1:        config.site
 Source2:        autoconf-el.el
 
-Patch1:         backport-_AC_PROG_CXX_STDCXX_EDITION_TRY-fix-typo-in-variable.patch
-Patch2:         backport-Fix-testsuite-failures-with-bash-5.2.patch
+Patch6001:      backport-_AC_PROG_CXX_STDCXX_EDITION_TRY-fix-typo-in-variable.patch
+Patch6002:      backport-Fix-testsuite-failures-with-bash-5.2.patch
+Patch6003:      backport-Fix-timing-bug-on-high-speed-builds.patch
 
 Patch9000:      skip-one-test-at-line-1616-of-autotest.patch
 
@@ -73,6 +74,12 @@ fi
 
 
 %changelog
+* Tue Aug 26 2025 yueyuankun <yueyuankun@kylinos.cn> - 2.71-10
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:Fix timing bug on high-speed builds
+
 * Fri Dec 06 2024 Funda Wang <fundawang@yeah.net> - 2.71-9
 - revert previous fix, as it causes too many regressions
 
diff --git a/backport-Fix-timing-bug-on-high-speed-builds.patch b/backport-Fix-timing-bug-on-high-speed-builds.patch
new file mode 100644
index 0000000..67afb09
--- /dev/null
+++ b/backport-Fix-timing-bug-on-high-speed-builds.patch
@@ -0,0 +1,72 @@
+From 713d9822bbfb2923115065efaefed34a0113f8a1 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Sat, 1 Apr 2023 16:44:03 -0700
+Subject: Fix timing bug on high-speed builds
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Problem reported by Bogdan via Jacob Bachmeyer in:
+https://lists.gnu.org/r/autoconf/2023-04/msg00002.html
+* bin/autom4te.in: If a file timestamp equals a dependency’s
+timestamp, consider the file to be out of date.  Although this may
+result in extra work, it fixes some rare timing bugs.
+---
+ bin/autom4te.in | 12 +++++-------
+ 1 file changed, 5 insertions(+), 7 deletions(-)
+
+diff --git a/bin/autom4te.in b/bin/autom4te.in
+index 4b61f0a8..71d7e6a6 100644
+--- a/bin/autom4te.in
++++ b/bin/autom4te.in
+@@ -910,10 +910,8 @@ sub up_to_date ($)
+   return 0
+     if ! -f $tfile || ! -f $ofile;
+ 
+-  # The youngest of the cache files must be older than the oldest of
++  # The younger of the cache files must be older than the oldest of
+   # the dependencies.
+-  # FIXME: These timestamps have only 1-second resolution.
+-  # Time::HiRes fixes this, but assumes Perl 5.8 or later.
+   my $tmtime = mtime ($tfile);
+   my $omtime = mtime ($ofile);
+   my ($file, $mtime) = ($tmtime < $omtime
+@@ -926,7 +924,7 @@ sub up_to_date ($)
+   # We depend at least upon the arguments.
+   foreach my $dep (@ARGV)
+     {
+-      if ($mtime < mtime ($dep))
++      if ($mtime <= mtime ($dep))
+ 	{
+ 	  verb "up_to_date ($file): outdated: $dep";
+ 	  return 0;
+@@ -949,7 +947,7 @@ sub up_to_date ($)
+       # timestamp of that missing file was newer).
+       return 0
+ 	if ! $dep;
+-      if ($mtime < mtime ($dep))
++      if ($mtime <= mtime ($dep))
+ 	{
+ 	  verb "up_to_date ($file): outdated: $dep";
+ 	  return 0;
+@@ -1038,7 +1036,7 @@ $icache_file = new Autom4te::XFile $icache, O_RDWR|O_CREAT;
+ $icache_file->lock (LOCK_EX)
+   if ($flock_implemented eq "yes");
+ 
+-# Read the cache index if available and older than autom4te itself.
++# Read the cache index if available and younger than autom4te itself.
+ # If autom4te is younger, then some structures such as C4che might
+ # have changed, which would corrupt its processing.
+ Autom4te::C4che->load ($icache_file)
+@@ -1105,7 +1103,7 @@ else
+     # Actual M4 expansion, if the user wants it, or if $output is old
+     # (STDOUT is pretty old).
+     handle_output ($req, $output)
+-      if $force || mtime ($output) < mtime ($ocache . $req->id);
++      if $force || mtime ($output) <= mtime ($ocache . $req->id);
+   }
+ 
+ # If we ran up to here, the cache is valid.
+-- 
+cgit v1.2.3
+
-- 
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