unittest first checks if files exists for neon detection.

BUG=315
TESTED=untested
R=nfullagar@chromium.org, wuwang@google.com

Review URL: https://webrtc-codereview.appspot.com/9589005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@981 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 980
+Version: 981
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 980
+#define LIBYUV_VERSION 981
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

unit_test/cpu_test.cc

@@ -92,16 +92,24 @@ TEST_F(libyuvTest, TestCpuId) {
 }
 #endif
 
+static int FileExists(const char* file_name) {
+  FILE* f = fopen(file_name, "r");
+  if (!f) {
+    return 0;
+  }
+  fclose(f);
+  return 1;
+}
+
 TEST_F(libyuvTest, TestLinuxNeon) {
-  int testdata = ArmCpuCaps("unit_test/testdata/arm_v7.txt");
-  if (testdata) {
-    EXPECT_EQ(0, ArmCpuCaps("unit_test/testdata/arm_v7.txt"));
-    EXPECT_EQ(kCpuHasNEON, ArmCpuCaps("unit_test/testdata/tegra3.txt"));
+  if (FileExists("../../unit_test/testdata/arm_v7.txt")) {
+    EXPECT_EQ(0, ArmCpuCaps("../../unit_test/testdata/arm_v7.txt"));
+    EXPECT_EQ(kCpuHasNEON, ArmCpuCaps("../../unit_test/testdata/tegra3.txt"));
   } else {
-    printf("WARNING: unable to load \"unit_test/testdata/arm_v7.txt\"\n");
+    printf("WARNING: unable to load \"../../unit_test/testdata/arm_v7.txt\"\n");
   }
 #if defined(__linux__) && defined(__ARM_NEON__)
-  EXPECT_NE(0, ArmCpuCaps("/proc/cpuinfo"));
+  EXPECT_EQ(kCpuHasNEON, ArmCpuCaps("/proc/cpuinfo"));
 #endif
 }