From c588541ab548aa093b6b31196ae3cff7bb9250fe Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@debian.org>
Date: Sat, 5 Jan 2019 10:53:43 +0000
Subject: Use tar --sort=name if available

* m4/man-tar-sort-name.m4: New file.
* configure.ac: Call MAN_TAR_SORT_NAME.
---
 m4/man-tar-sort-name.m4 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 m4/man-tar-sort-name.m4

(limited to 'm4')

diff --git a/m4/man-tar-sort-name.m4 b/m4/man-tar-sort-name.m4
new file mode 100644
index 00000000..00a3cab6
--- /dev/null
+++ b/m4/man-tar-sort-name.m4
@@ -0,0 +1,21 @@
+# man-tar-sort-name.m4 serial 1
+dnl MAN_TAR_SORT_NAME
+dnl Use the --sort=name option of GNU tar if it is available.
+dnl Note that this only works with Automake's default tar-v7 option.
+
+AC_DEFUN([MAN_TAR_SORT_NAME],
+[
+AC_BEFORE([AM_INIT_AUTOMAKE], [$0])
+AC_MSG_CHECKING([if tar --sort=name works])
+rm -rf conftest.dir
+mkdir conftest.dir
+echo GrepMe > conftest.dir/file
+AM_RUN_LOG([${TAR-tar} chof - conftest.dir --sort=name >conftest.tar])
+if test -s conftest.tar; then
+	AC_MSG_RESULT([yes])
+	am__tar="$am__tar --sort=name"
+else
+	AC_MSG_RESULT([no])
+fi
+rm -rf conftest.dir
+])
-- 
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