Fix TimeValue::now() on Unix.

TimeValue()::now().toEpochTime() is supposed to be the same as time(),
but it wasn't, because toEpoch subtracted PosixZeroTime, but now()
didn't add PosixZeroTime!
Add a unittest to check this works.

llvm-svn: 94178

1 files changed, 16 insertions, 0 deletions

diff --git a/llvm/unittests/Support/System.cpp b/llvm/unittests/Support/System.cpp
new file mode 100644
index 00000000000..b3dd17d380d
--- /dev/null
+++ b/llvm/unittests/Support/System.cpp
@@ -0,0 +1,16 @@
+//===- llvm/unittest/Support/System.cpp - System tests --===//
+#include "gtest/gtest.h"
+#include "llvm/System/TimeValue.h"
+#include <time.h>
+
+using namespace llvm;
+namespace {
+class SystemTest : public ::testing::Test {
+};
+
+TEST_F(SystemTest, TimeValue) {
+  sys::TimeValue now = sys::TimeValue::now();
+  time_t now_t = time(NULL);
+  EXPECT_TRUE(abs(now_t - now.toEpochTime()) < 2);
+}
+}