Merge branch 'rm-f-probe' into maint

* rm-f-probe:
  init.m4: add probe to check "rm -f" without args work

5 files changed, 125 insertions, 9 deletions

diff --git a/PLANS/rm-f-without-args.txt b/PLANS/rm-f-without-args.txt
index 5d39e220d..5362f98e6 100644
--- a/PLANS/rm-f-without-args.txt
+++ b/PLANS/rm-f-without-args.txt
@@ -13,13 +13,13 @@ accordingly, to get rid of the awful idiom:
 
 See automake bug#10828.
 
-For Automake 1.13.2 (or 1.13.3)
--------------------------------
+For Automake 1.13.2 (DONE)
+--------------------------
 
 Add a temporary "probe check" in AM_INIT_AUTOMAKE that verifies that
 the no-args "rm -f" usage is supported on the system configure is
-being run on; complain loudly (but not with a fatal error) if this is
-not the case, and tell the user to report the situation to us.
+being run on; complain loudly if this is not the case, and tell the
+user to report the situation to us.
 
 For Automake 1.14
 -----------------
diff --git a/m4/init.m4 b/m4/init.m4
index c5af65cce..ce64a6ccf 100644
--- a/m4/init.m4
+++ b/m4/init.m4
@@ -117,7 +117,48 @@ dnl macro is hooked onto _AC_COMPILER_EXEEXT early, see below.
 AC_CONFIG_COMMANDS_PRE(dnl
 [m4_provide_if([_AM_COMPILER_EXEEXT],
   [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
-])
+
+# POSIX will say in a future version that running "rm -f" with no argument
+# is OK; and we want to be able to make that assumption in our Makefile
+# recipes.  So use an aggressive probe to check that the usage we want is
+# actually supported "in the wild" to an acceptable degree.
+# See automake bug#10828.
+# To make any issue more visible, cause the running configure to be aborted
+# by default if the 'rm' program in use doesn't match our expectations; the
+# user can still override this though.
+if rm -f && rm -fr && rm -rf; then : OK; else
+  cat >&2 <<'END'
+Oops!
+
+Your 'rm' program seems unable to run without file operands specified
+on the command line, even when the '-f' option is present.  This is contrary
+to the behaviour of most rm programs out there, and not conforming with
+the upcoming POSIX standard: <http://austingroupbugs.net/view.php?id=542>
+
+Please tell bug-automake@gnu.org about your system, including the value
+of your $PATH and any error possibly output before this message.  This
+can help us improve future automake versions.
+
+END
+  if test x"$ACCEPT_INFERIOR_RM_PROGRAM" = x"yes"; then
+    echo 'Configuration will proceed anyway, since you have set the' >&2
+    echo 'ACCEPT_INFERIOR_RM_PROGRAM variable to "yes"' >&2
+    echo >&2
+  else
+    cat >&2 <<'END'
+Aborting the configuration process, to ensure you take notice of the issue.
+
+You can download and install GNU coreutils to get an 'rm' implementation
+that behaves properly: <http://www.gnu.org/software/coreutils/>.
+
+If you want to complete the configuration process using your problematic
+'rm' anyway, export the environment variable ACCEPT_INFERIOR_RM_PROGRAM
+to "yes", and re-run configure.
+
+END
+    AC_MSG_ERROR([Your 'rm' program is bad, sorry.])
+  fi
+fi])
 
 dnl Hook into '_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
 dnl add the conditional right here, as _AC_COMPILER_EXEEXT may be further
diff --git a/t/list-of-tests.mk b/t/list-of-tests.mk
index 44f598ed2..0f5dbee01 100644
--- a/t/list-of-tests.mk
+++ b/t/list-of-tests.mk
@@ -953,6 +953,7 @@ t/remake-macrodir.sh \
 t/remake-timing-bug-pr8365.sh \
 t/reqd2.sh \
 t/repeated-options.sh \
+t/rm-f-probe.sh \
 t/rulepat.sh \
 t/self-check-cc-no-c-o.sh \
 t/self-check-configure-help.sh \
diff --git a/t/rm-f-probe.sh b/t/rm-f-probe.sh
new file mode 100755
index 000000000..1cb220aa0
--- /dev/null
+++ b/t/rm-f-probe.sh
@@ -0,0 +1,74 @@
+#! /bin/sh
+# Copyright (C) 2013 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Verify our probe that checks that "rm -f" doesn't complain if called
+# without file operands works as expected.  See automake bug#10828.
+
+. test-init.sh
+
+echo AC_OUTPUT >> configure.ac
+: > Makefile.am
+
+$ACLOCAL
+$AUTOCONF
+$AUTOMAKE
+
+mkdir bin
+cat > bin/rm <<'END'
+#!/bin/sh
+set -e; set -u;
+PATH=$original_PATH; export PATH
+rm_opts=
+while test $# -gt 0; do
+  case $1 in
+    -*) rm_opts="$rm_opts $1";;
+     *) break;;
+  esac
+  shift
+done
+if test $# -eq 0; then
+  echo "Oops, fake rm called without arguments" >&2
+  exit 1
+else
+  exec rm $rm_opts "$@"
+fi
+END
+chmod a+x bin/rm
+
+original_PATH=$PATH
+PATH=$(pwd)/bin$PATH_SEPARATOR$PATH
+export PATH original_PATH
+
+rm -f && exit 99 # Sanity check.
+
+./configure 2>stderr && { cat stderr >&2; exit 1; }
+cat stderr >&2
+
+grep "'rm' program.* unable to run without file operands" stderr
+$FGREP "tell bug-automake@gnu.org about your system" stderr
+$FGREP "install GNU coreutils" stderr
+$EGREP "(^| |')ACCEPT_INFERIOR_RM_PROGRAM($| |')" stderr
+
+ACCEPT_INFERIOR_RM_PROGRAM=yes; export ACCEPT_INFERIOR_RM_PROGRAM
+
+./configure
+$MAKE
+$MAKE distcheck
+
+# For the sake of our exit trap.
+PATH=$original_PATH; export PATH
+
+:
diff --git a/t/spy-rm.tap b/t/spy-rm.tap
index 29840abf4..3b8dd2d10 100755
--- a/t/spy-rm.tap
+++ b/t/spy-rm.tap
@@ -19,10 +19,10 @@
 # to hold on all non-museum systems, and will soon be mandated
 # by POSIX as well) in future version of automake, to simplify
 # automake-provided cleanup rules.
-# References:
-#  <http://lists.gnu.org/archive/html/bug-autoconf/2012-02/msg00002.html>
-#  <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=10819>
-#  <http://austingroupbugs.net/view.php?id=542>
+# See automake bug#10828.
+# Other references:
+# <http://lists.gnu.org/archive/html/bug-autoconf/2012-02/msg00002.html>
+# <http://austingroupbugs.net/view.php?id=542>
 
 am_create_testdir=empty
 . test-init.sh