diff --git a/cmake/external/openblas.cmake b/cmake/external/openblas.cmake
index 0eeccbf7d8a1df17351c8914df6dabf005802787..0002a470d90f722e3f9106ca56d70e6bf2cea339 100644
--- a/cmake/external/openblas.cmake
+++ b/cmake/external/openblas.cmake
@@ -25,7 +25,12 @@ IF(NOT ${CBLAS_FOUND})
         "${CBLAS_INSTALL_DIR}/lib/${CMAKE_STATIC_LIBRARY_PREFIX}openblas${CMAKE_STATIC_LIBRARY_SUFFIX}"
         CACHE FILEPATH "openblas library." FORCE)
 
-    SET(COMMON_ARGS CC=${CMAKE_C_COMPILER} NO_SHARED=1 NO_LAPACK=1 libs)
+    IF(APPLE)
+        SET(OPENBLAS_CC "${CMAKE_C_COMPILER} -isysroot ${CMAKE_OSX_SYSROOT}")
+        SET(COMMON_ARGS CC=${OPENBLAS_CC} NO_SHARED=1 NO_LAPACK=1 libs)
+    ELSE()
+        SET(COMMON_ARGS CC=${CMAKE_C_COMPILER} NO_SHARED=1 NO_LAPACK=1 libs)
+    ENDIF()
 
     IF(CMAKE_CROSSCOMPILING)
         IF(ANDROID)
@@ -40,11 +45,11 @@ IF(NOT ${CBLAS_FOUND})
             SET(OPTIONAL_ARGS HOSTCC=${HOST_C_COMPILER} TARGET=${TARGET} ARM_SOFTFP_ABI=1 USE_THREAD=0)
         ELSEIF(RPI)
             # use hardfp
-            SET(OPENBLAS_COMMIT "v0.2.19")
+            SET(OPENBLAS_COMMIT "v0.2.20")
             SET(OPTIONAL_ARGS HOSTCC=${HOST_C_COMPILER} TARGET=ARMV7 USE_THREAD=0)
         ENDIF()
     ELSE()
-        SET(OPENBLAS_COMMIT "v0.2.19")
+        SET(OPENBLAS_COMMIT "v0.2.20")
         SET(OPTIONAL_ARGS "")
         IF(CMAKE_SYSTEM_PROCESSOR MATCHES "^x86(_64)?$")
             SET(OPTIONAL_ARGS DYNAMIC_ARCH=1 NUM_THREADS=64)
diff --git a/paddle/gserver/layers/CrossEntropyOverBeam.cpp b/paddle/gserver/layers/CrossEntropyOverBeam.cpp
index 4acc077035b17fdf5ec06e0d4d916fa0a62f6cba..578bdbbe72120abccc63ed13d11e1dec65d41e44 100644
--- a/paddle/gserver/layers/CrossEntropyOverBeam.cpp
+++ b/paddle/gserver/layers/CrossEntropyOverBeam.cpp
@@ -223,7 +223,7 @@ void CrossEntropyOverBeam::checkInputs() {
                                 << inputLayers_[i * 3]->getName()
                                 << " should be a nested sequence";
       CHECK_EQ(getInputValue(i * 3 + 1)->getWidth(), beamSize_);
-      CHECK_EQ(scores.getNumSequences(), batchSize_);
+      CHECK_EQ(batchSize_, static_cast<size_t>(scores.getNumSequences()));
       CHECK_EQ(scores.getNumSubSequences(), selCandidates.getBatchSize());
     } else {
       CHECK(scores.hasSeq()) << "input " << i << " "
@@ -231,10 +231,10 @@ void CrossEntropyOverBeam::checkInputs() {
                              << " should be a sequence";
       batchSize_ = scores.getNumSequences();
       beamSize_ = getInputValue(i * 3 + 1)->getWidth();
-      CHECK_EQ(batchSize_, selCandidates.getBatchSize());
+      CHECK_EQ(batchSize_, static_cast<size_t>(selCandidates.getBatchSize()));
     }
     CHECK_EQ(1U, scores.value->getWidth());
-    CHECK_EQ(batchSize_, goldSeq.getBatchSize());
+    CHECK_EQ(batchSize_, static_cast<size_t>(goldSeq.getBatchSize()));
   }
 }
 
@@ -377,8 +377,8 @@ void CrossEntropyOverBeam::forward(PassType passType) {
 
   MatrixPtr outputValue = getOutputValue();
   for (size_t i = 0; i < batchSize_; ++i) {
-    beamCosts_[i].setData(
-        std::move(std::make_shared<BeamExpansion>(beamPerSeq_[i])), beamSize_);
+    BeamExpansionPtr ptr = std::make_shared<BeamExpansion>(beamPerSeq_[i]);
+    beamCosts_[i].setData(std::move(ptr), beamSize_);
     outputValue->getData()[i] = beamCosts_[i].forward();
   }
 }