From 38da1d906a33dccb9372132a241f906e3dc2eba5 Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Thu, 17 Feb 2022 04:35:03 -0500
Subject: python: use xargs -n when uninstalling files

Fixes automake bug https://bugs.gnu.org/53340.

If the system has xargs, then utilize it to uninstall files to stay
within long command line limits.  If the system doesn't have xargs,
fall back to running the remove command one at a time.  Since every
reasonable system should have `xargs -n`, and POSIX requires it, the
fallback probably rarely gets used, so don't bother optimizing.

* lib/am/inst-vars.am: Use am__xargs_n to call rm -f on the files.
* lib/am/python.am: Drop am__base_list and for loop and let the
am__uninstall_files_from_dir break up the long command lines.
* m4/init.m4: Call _AM_PROG_XARGS_N.
* m4/xargsn.m4: New test for `xargs -n`.
---
 m4/init.m4   |  1 +
 m4/xargsn.m4 | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 m4/xargsn.m4

(limited to 'm4')

diff --git a/m4/init.m4 b/m4/init.m4
index e576b935d..f3abf66c6 100644
--- a/m4/init.m4
+++ b/m4/init.m4
@@ -143,6 +143,7 @@ AC_CONFIG_COMMANDS_PRE(dnl
   [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
 
 AC_REQUIRE([_AM_PROG_RM_F])
+AC_REQUIRE([_AM_PROG_XARGS_N])
 
 dnl The trailing newline in this macro's definition is deliberate, for
 dnl backward compatibility and to allow trailing 'dnl'-style comments
diff --git a/m4/xargsn.m4 b/m4/xargsn.m4
new file mode 100644
index 000000000..8ddf2d8f4
--- /dev/null
+++ b/m4/xargsn.m4
@@ -0,0 +1,20 @@
+##                                                          -*- Autoconf -*-
+# Copyright (C) 2022 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# _AM_PROG_XARGS_N
+# ----------------
+# Check whether 'xargs -n' works.  It should work everywhere, so the fallback
+# is not optimized at all as we never expect to use it.
+AC_DEFUN([_AM_PROG_XARGS_N],
+[AC_CACHE_CHECK([xargs -n works], am_cv_xargs_n_works, [dnl
+AS_IF([test "`echo 1 2 3 | xargs -n2 echo`" = "1 2
+3"], [am_cv_xargs_n_works=yes], [am_cv_xargs_n_works=no])])
+AS_IF([test "$am_cv_xargs_n_works" = yes], [am__xargs_n='xargs -n'], [dnl
+  am__xargs_n='am__xargs_n () { shift; sed "s/ /\\n/g" | while read am__xargs_n_arg; do "$@" "$am__xargs_n_arg"; done; }'
+])dnl
+AC_SUBST(am__xargs_n)
+])
-- 
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