OclocInvoke suppress print to stdout if has output

Suppressing output could be achieved with quiet option "-q",
but some information was gone because of it.
Call to oclocInvoke with output parameters passed should not
print message to stdout. All messages should be stored,
and returned to the user via output as stdout.log file.
This commit turns off printing messages to stdout when
output parameters are present.

Signed-off-by: Krystian Chmielewski <krystian.chmielewski@intel.com>

opencl/test/unit_test/offline_compiler/offline_compiler_tests.cpp

@@ -2063,4 +2063,52 @@ TEST(OfflineCompilerTest, GivenDebugFlagWhenSetStatelessToStatefullBufferOffsetF
     }
 }
 
+struct WhiteBoxOclocArgHelper : public OclocArgHelper {
+    using OclocArgHelper::messagePrinter;
+    using OclocArgHelper::OclocArgHelper;
+};
+
+TEST(OclocArgHelperTest, GivenOutputSuppressMessagesAndSaveItToFile) {
+    uint32_t numOutputs = 0U;
+    uint64_t *lenOutputs = nullptr;
+    uint8_t **outputs = nullptr;
+    char **nameOutputs = nullptr;
+    auto helper = std::unique_ptr<WhiteBoxOclocArgHelper>(new WhiteBoxOclocArgHelper(0, nullptr, nullptr, nullptr,
+                                                                                     0, nullptr, nullptr, nullptr,
+                                                                                     &numOutputs, &outputs, &lenOutputs, &nameOutputs));
+    EXPECT_TRUE(helper->messagePrinter.isSuppressed());
+
+    ConstStringRef printMsg = "Hello world!";
+    testing::internal::CaptureStdout();
+    helper->printf(printMsg.data());
+    std::string capturedStdout = testing::internal::GetCapturedStdout();
+    EXPECT_TRUE(capturedStdout.empty());
+
+    helper.reset(); // Delete helper. Destructor saves data to output
+    EXPECT_EQ(1U, numOutputs);
+    EXPECT_EQ(printMsg.length(), lenOutputs[0]);
+    EXPECT_STREQ("stdout.log", nameOutputs[0]);
+    std::string stdoutStr = std::string(reinterpret_cast<const char *>(outputs[0]),
+                                        static_cast<size_t>(lenOutputs[0]));
+    EXPECT_STREQ(printMsg.data(), stdoutStr.c_str());
+
+    delete[] nameOutputs[0];
+    delete[] outputs[0];
+    delete[] nameOutputs;
+    delete[] outputs;
+    delete[] lenOutputs;
+}
+
+TEST(OclocArgHelperTest, GivenNoOutputPrintMessages) {
+    auto helper = WhiteBoxOclocArgHelper(0, nullptr, nullptr, nullptr,
+                                         0, nullptr, nullptr, nullptr,
+                                         nullptr, nullptr, nullptr, nullptr);
+    EXPECT_FALSE(helper.messagePrinter.isSuppressed());
+    ConstStringRef printMsg = "Hello world!";
+    testing::internal::CaptureStdout();
+    helper.printf(printMsg.data());
+    std::string capturedStdout = testing::internal::GetCapturedStdout();
+    EXPECT_STREQ(printMsg.data(), capturedStdout.c_str());
+}
+
 } // namespace NEO