Bug 717372 - The clobber information should live in the tree; r=khuey

CLOBBER

@@ -0,0 +1,18 @@
+# To Trigger a clobber replace ALL of the textual description below,
+# giving a bug number and a one line description of why a clobber is
+# required. Modifying this file will make configure check that a
+# clobber has been performed before the build can continue.
+#
+# MERGE NOTE: When merging two branches that require a CLOBBER, you should
+#             merge both CLOBBER descriptions, to ensure that users on
+#             both branches correctly see the clobber warning.
+#
+#                  O   <-- Users coming from both parents need to Clobber
+#               /     \
+#          O               O
+#          |               |
+#          O <-- Clobber   O  <-- Clobber
+#
+# Note: The description below will be part of the error message shown to users.
+#
+Bug 717372 - The clobber information should live in the tree

client.mk

@@ -279,6 +279,7 @@ CONFIG_STATUS_DEPS := \
   $(wildcard $(TOPSRCDIR)/*/confvars.sh) \
   $(CONFIGURES) \
   $(TOPSRCDIR)/allmakefiles.sh \
+  $(TOPSRCDIR)/CLOBBER \
   $(TOPSRCDIR)/nsprpub/configure \
   $(TOPSRCDIR)/config/milestone.txt \
   $(TOPSRCDIR)/js/src/config/milestone.txt \

configure.in

@@ -123,6 +123,22 @@ then
 fi
 MOZ_BUILD_ROOT=`pwd`
 
+dnl Do not allow building if a clobber is required
+dnl ==============================================================
+dnl TODO Make this better, ideally this would clobber automaticially
+if test -e $_objdir/CLOBBER; then
+  if test $_topsrcdir/CLOBBER -nt $_objdir/CLOBBER; then
+    echo "	***"
+    echo "	*	CLOBBER has been modified indicating a clobber is required:"
+    cat $_topsrcdir/CLOBBER | sed '/^#/d' | sed 's/^/	*	/'
+    echo "	***"
+    exit 1
+    break;
+  fi
+else
+  touch $_objdir/CLOBBER
+fi
+
 MOZ_PATH_PROGS(PYTHON, $PYTHON python2.7 python2.6 python2.5 python)
 if test -z "$PYTHON"; then
     AC_MSG_ERROR([python was not found in \$PATH])