From d76d2febbfd55243f471ea3521337d81e10f5971 Mon Sep 17 00:00:00 2001
From: Yu Yang <yuyang18@baidu.com>
Date: Mon, 26 Jun 2017 11:52:50 +0800
Subject: [PATCH] Adding platform/must_check.h

__must_check is a macro mark of function return value. It let developer
must check the return value is legal or not.
---
 paddle/platform/CMakeLists.txt                  |  1 +
 .../{utils/Compiler.h => platform/must_check.h} | 17 +++++------------
 paddle/platform/must_check_test.cc              | 10 ++++++++++
 paddle/utils/Error.h                            |  2 +-
 4 files changed, 17 insertions(+), 13 deletions(-)
 rename paddle/{utils/Compiler.h => platform/must_check.h} (78%)
 create mode 100644 paddle/platform/must_check_test.cc

diff --git a/paddle/platform/CMakeLists.txt b/paddle/platform/CMakeLists.txt
index c7d7b1451..7abe2ab89 100644
--- a/paddle/platform/CMakeLists.txt
+++ b/paddle/platform/CMakeLists.txt
@@ -2,3 +2,4 @@ nv_test(cuda_test SRCS cuda_test.cu)
 
 cc_library(place SRCS place.cc)
 cc_test(place_test SRCS place_test.cc DEPS place glog gflags)
+cc_test(must_check_test SRCS must_check_test.cc)
diff --git a/paddle/utils/Compiler.h b/paddle/platform/must_check.h
similarity index 78%
rename from paddle/utils/Compiler.h
rename to paddle/platform/must_check.h
index cebca5a2a..4fcc62afc 100644
--- a/paddle/utils/Compiler.h
+++ b/paddle/platform/must_check.h
@@ -10,24 +10,17 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #pragma once
-/**
- * This header defines some useful attribute by each compiler. It is the
- * abstract layer of compilers.
- */
-#ifdef __GNUC__
-#define GCC_VERSION \
-  (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
-#else
-#define GCC_VERSION
-#endif
-
 /**
  * __must_check macro. It make the function's return value must be used,
  * otherwise it will raise a compile warning. And also Paddle treat all compile
  * warnings as errors.
  */
-#if GCC_VERSION >= 30400
+#ifdef __GNUC__
+#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 30400
 #define __must_check __attribute__((warn_unused_result))
 #else
 #define __must_check
 #endif
+#else
+#define __must_check
+#endif
diff --git a/paddle/platform/must_check_test.cc b/paddle/platform/must_check_test.cc
new file mode 100644
index 000000000..6ee3ea49a
--- /dev/null
+++ b/paddle/platform/must_check_test.cc
@@ -0,0 +1,10 @@
+#include <gtest/gtest.h>
+#include <paddle/platform/must_check.h>
+
+int __must_check SomeFunctionMustCheck() { return 0; }
+
+TEST(MustCheck, all) {
+  //  This line should not be compiled, because the
+  //  return value of SomeFunctionMustCheck marked as __must_check
+  //  SomeFunctionMustCheck();
+}
\ No newline at end of file
diff --git a/paddle/utils/Error.h b/paddle/utils/Error.h
index cda1b5c37..f3d535c69 100644
--- a/paddle/utils/Error.h
+++ b/paddle/utils/Error.h
@@ -19,7 +19,7 @@ limitations under the License. */
 #include <stdio.h>
 #include <memory>
 #include <string>
-#include "Compiler.h"
+#include "paddle/platform/must_check.h"
 
 namespace paddle {
 
-- 
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