Use target file name generator exp in CMake test rules.

BUG=aomedia:76,aomedia:549

Change-Id: I692f4ad86061e53f9dc4b9a45d4dd9a8bd0d82d5

test/test.cmake

@@ -364,11 +364,9 @@ function (setup_aom_test_targets)
     set(test_name "test_${shard_index}")
     add_custom_target(${test_name}
                       COMMAND ${CMAKE_COMMAND}
-                      -DAOM_CONFIG_DIR="${AOM_CONFIG_DIR}"
-                      -DAOM_ROOT="${AOM_ROOT}"
-                      -DAOM_TEST_TARGET=test_libaom
                       -DGTEST_SHARD_INDEX=${shard_index}
                       -DGTEST_TOTAL_SHARDS=${num_test_targets}
+                      -DTEST_LIBAOM=$<TARGET_FILE:test_libaom>
                       -P "${AOM_ROOT}/test/test_runner.cmake"
                       DEPENDS testdata test_libaom)
     set(test_targets ${test_targets} ${test_name})
@@ -378,13 +376,10 @@ function (setup_aom_test_targets)
 
   if (MSVC)
     set_target_properties(${testdata_targets} PROPERTIES
-                          EXCLUDE_FROM_ALL TRUE
                           EXCLUDE_FROM_DEFAULT_BUILD TRUE)
     set_target_properties(${test_targets} PROPERTIES
-                          EXCLUDE_FROM_ALL TRUE
                           EXCLUDE_FROM_DEFAULT_BUILD TRUE)
     set_target_properties(testdata runtests PROPERTIES
-                          EXCLUDE_FROM_ALL TRUE
                           EXCLUDE_FROM_DEFAULT_BUILD TRUE)
   endif ()
 endfunction ()

test/test_runner.cmake

@@ -8,13 +8,13 @@
 ## Media Patent License 1.0 was not distributed with this source code in the
 ## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 ##
-if (NOT AOM_ROOT OR NOT AOM_CONFIG_DIR OR NOT AOM_TEST_TARGET
-    OR NOT GTEST_TOTAL_SHARDS OR "${GTEST_SHARD_INDEX}" STREQUAL "")
+if (NOT GTEST_TOTAL_SHARDS OR "${GTEST_SHARD_INDEX}" STREQUAL ""
+    OR NOT TEST_LIBAOM)
   message(FATAL_ERROR
-          "The variables AOM_ROOT AOM_CONFIG_DIR AOM_TEST_TARGET
-          GTEST_SHARD_INDEX and GTEST_TOTAL_SHARDS must be defined.")
+          "The variables GTEST_SHARD_INDEX, GTEST_TOTAL_SHARDS and TEST_LIBAOM
+          must be defined.")
 endif ()
 
 set($ENV{GTEST_SHARD_INDEX} ${GTEST_SHARD_INDEX})
 set($ENV{GTEST_TOTAL_SHARDS} ${GTEST_TOTAL_SHARDS})
-execute_process(COMMAND ${AOM_CONFIG_DIR}/${AOM_TEST_TARGET})
+execute_process(COMMAND ${TEST_LIBAOM})