diff -r 000000000000 -r 6474c204b198 build/unix/print-failed-commands.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/unix/print-failed-commands.sh	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+#!/bin/sh
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#
+# Usage from makefile:
+#   ELOG = . $(topdir)/build/autoconf/print-failed-commands.sh
+#   $(ELOG) $(CC) $CFLAGS -o $@ $<
+#
+# This shell script is used by the build system to print out commands that fail
+# to execute properly.  It is designed to make the "make -s" command more
+# useful.
+#
+# Note that in the example we are sourcing rather than execing the script.
+# Since make already started a shell for us, we might as well use it rather
+# than starting a new one.
+
+( exec "$@" ) || {
+    echo
+    echo "In the directory " `pwd`
+    echo "The following command failed to execute properly:"
+    echo "$@"
+    exit 1;
+}