GNU bug report logs - #20713
aclocal/tar.m4 and solaris 5.10 where `id -u` is not supported

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From: Mike Frysinger <vapier <at> gentoo.org>
To: 20713 <at> debbugs.gnu.org
Subject: bug#20713: [PATCH] m4: handle id failures when checking ustar support
Date: Thu, 24 Feb 2022 22:23:34 -0500

Fixes automake bug https://bugs.gnu.org/20713.

If `id` fails, display a specific warning message to the user.

* m4/tar.m4: Check $am_uid & $am_gid if they're unknown.
---
 m4/tar.m4 | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/m4/tar.m4 b/m4/tar.m4
index 7e3df4f98e1c..8f4d2f21394b 100644
--- a/m4/tar.m4
+++ b/m4/tar.m4
@@ -46,15 +46,19 @@ m4_if([$1], [v7],
       am_uid=`id -u || echo unknown`
       am_gid=`id -g || echo unknown`
       AC_MSG_CHECKING([whether UID '$am_uid' is supported by ustar format])
-      if test $am_uid -le $am_max_uid; then
-         AC_MSG_RESULT([yes])
+      if test x$am_uid = xunknown; then
+        AC_MSG_WARN([ancient id detected; assuming current UID is ok, but dist-ustar might not work])
+      elif test $am_uid -le $am_max_uid; then
+        AC_MSG_RESULT([yes])
       else
-         AC_MSG_RESULT([no])
-         _am_tools=none
+        AC_MSG_RESULT([no])
+        _am_tools=none
       fi
       AC_MSG_CHECKING([whether GID '$am_gid' is supported by ustar format])
-      if test $am_gid -le $am_max_gid; then
-         AC_MSG_RESULT([yes])
+      if test x$gm_gid = xunknown; then
+        AC_MSG_WARN([ancient id detected; assuming current GID is ok, but dist-ustar might not work])
+      elif test $am_gid -le $am_max_gid; then
+        AC_MSG_RESULT([yes])
       else
         AC_MSG_RESULT([no])
         _am_tools=none
-- 
2.34.1

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