From bcf98160c4ae23dd1ede2cc99b31c1591c08014c Mon Sep 17 00:00:00 2001
From: heister <heister@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Fri, 11 Jan 2013 02:45:34 +0000
Subject: [PATCH] optionally allow running the testsuite with numdiff

git-svn-id: https://svn.dealii.org/trunk@28013 0785d39b-7218-0410-832d-ea1e28bc413d
---
 tests/Makefile.rules | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/tests/Makefile.rules b/tests/Makefile.rules
index 282d3dfc3f..ec4ba33478 100644
--- a/tests/Makefile.rules
+++ b/tests/Makefile.rules
@@ -23,6 +23,11 @@ verbose = off
 # The contents of the mail will be provided on STDIN
 MAIL=mail
 
+#this lets you overwrite the diff tool for comparisons.
+#recommended environment setting:
+#export DEALII_DIFF="numdiff -a 1e-6 -q"
+DEALII_DIFF?=diff 
+
 PLATFORM = $(TARGET)+$(GXX-VERSION:intel_%=%)
 PLATFORM-HIERARCHY = $(shell $(PERL) ../hierarchy.pl $(PLATFORM))
 
@@ -123,9 +128,9 @@ endif
 	    if test -f $$testname/cmp/$$i ; then \
 		cmpfile_found=yes ; \
 		if test "x$(verbose)" = "xon" ; then \
-			cmd="diff $(DIFFOPT) $< $$testname/cmp/$$i" ; \
+			cmd="$(DEALII_DIFF) $(DIFFOPT) $< $$testname/cmp/$$i" ; \
 		 else \
-			cmd="diff $< $$testname/cmp/$$i > /dev/null" ; \
+			cmd="$(DEALII_DIFF) $< $$testname/cmp/$$i > /dev/null" ; \
 		 fi ; \
 		 if eval $$cmd ; then \
 			echo '=====OK============' $@ ; \
-- 
2.39.5