Add Lapack warning

cmake/external/openblas.cmake

@@ -15,7 +15,6 @@
 INCLUDE(cblas)
 
 IF(NOT ${CBLAS_FOUND})
-    SET(LAPACK_FOUND OFF)
     INCLUDE(ExternalProject)
 
     SET(CBLAS_SOURCES_DIR ${THIRD_PARTY_PATH}/openblas)

paddle/math/tests/test_matrixCompare.cpp

@@ -236,8 +236,16 @@ TEST(Matrix, unary) {
       testMatrixTranspose(height, width);
       testMatrixRotate(height, width);
     }
+    #ifdef LAPACK_FOUND
     // inverse matrix
     testMatrixInverse(height);
+    #else
+    LOG(WARNING) << "Cannot run Matrix Inverse Unit Test.\n"
+                 << "Failed to find lapack library in current system.\n"
+                 << "To address this issue, Please adopt one of the following approaches: \n"
+                 << "1. Simply issue `sudo apt-get install liblapacke-dev` to avoid re-build source code. \n"
+                 << "2. Install MKL/Openblas/ATLAS and re-build PaddlePaddle source code."
+    #endif
   }
 }