From c7440f2f366809e9a51d260327fcdef78427bd0a Mon Sep 17 00:00:00 2001
From: Allen Byrne <byrn@hdfgroup.org>
Date: Wed, 28 Nov 2012 16:37:37 -0500
Subject: [svn-r23064] HDFFV-8202: Add diff display to cmake output on error.
 Merged changes from runTest.cmake.

---
 config/cmake/prunTest.cmake | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/config/cmake/prunTest.cmake b/config/cmake/prunTest.cmake
index 8bcf729..261f8a4 100644
--- a/config/cmake/prunTest.cmake
+++ b/config/cmake/prunTest.cmake
@@ -103,16 +103,30 @@ IF (NOT TEST_SKIP_COMPARE)
   ENDIF (WIN32 AND NOT MINGW)
 
   # now compare the output with the reference
-  EXECUTE_PROCESS (
-      COMMAND ${CMAKE_COMMAND} -E compare_files ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_FOLDER}/P_${TEST_REFERENCE}
-      RESULT_VARIABLE TEST_RESULT
-  )
+  SET (TEST_RESULT 0)
+  FILE (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} test_act)
+  LIST (LENGTH "${test_act}" len_act)
+  FILE (STRINGS ${TEST_FOLDER}/P_${TEST_REFERENCE} test_ref)
+  LIST (LENGTH "${test_ref}" len_ref)
+  MATH (EXPR _FP_LEN "${len_ref} - 1")
+  FOREACH (line RANGE 0 ${_FP_LEN})
+    LIST (GET "${test_act}" ${line} str_act)
+    LIST (GET "${test_ref}" ${line} str_ref)
+    STRING (COMPARE NOTEQUAL ${str_act} ${str_ref} str_res)
+    IF (${str_res})
+      SET (TEST_RESULT 1)
+      MESSAGE ("line = ${line}\n***ACTUAL: ${str_act}\n****REFER: ${str_ref}")
+    ENDIF (${str_res})
+  ENDFOREACH (line RANGE 0 ${_FP_LEN})
+  IF (NOT ${len_act} STREQUAL ${len_ref})
+    SET (TEST_RESULT 1)
+  ENDIF (NOT ${len_act} STREQUAL ${len_ref})
 
   MESSAGE (STATUS "COMPARE Result: ${TEST_RESULT}")
 
   # again, if return value is !=0 scream and shout
   IF (NOT ${TEST_RESULT} STREQUAL 0)
-    MESSAGE (FATAL_ERROR "Failed: The output of ${TEST_PROGRAM} did not match P_${TEST_REFERENCE}")
+    MESSAGE (FATAL_ERROR "Failed: The output of ${TEST_OUTPUT} did not match P_${TEST_REFERENCE}")
   ENDIF (NOT ${TEST_RESULT} STREQUAL 0)
 ENDIF (NOT TEST_SKIP_COMPARE)
 
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