allow c++ tests to run without internet (deepmodeling#785)

* fix bug when trying to find gtest in cmake

* link librt explicitly

* add script to test cc without installing tf

source/api_cc/tests/CMakeLists.txt

@@ -95,17 +95,17 @@ else()
 endif()
 
 if (USE_CUDA_TOOLKIT)
-  target_link_libraries(runUnitTests gtest gtest_main ${libname} ${apiname} ${opname} pthread ${TensorFlow_LIBRARY} deepmd_op_cuda coverage_config)
+  target_link_libraries(runUnitTests gtest gtest_main ${libname} ${apiname} ${opname} pthread ${TensorFlow_LIBRARY} rt deepmd_op_cuda coverage_config)
 elseif(USE_ROCM_TOOLKIT)
-  target_link_libraries(runUnitTests gtest gtest_main ${libname} ${apiname} ${opname} pthread ${TensorFlow_LIBRARY} deepmd_op_rocm coverage_config)
+  target_link_libraries(runUnitTests gtest gtest_main ${libname} ${apiname} ${opname} pthread ${TensorFlow_LIBRARY} rt deepmd_op_rocm coverage_config)
 else()
-  target_link_libraries(runUnitTests gtest gtest_main ${libname} ${apiname} ${opname} pthread ${TensorFlow_LIBRARY} coverage_config)
+  target_link_libraries(runUnitTests gtest gtest_main ${libname} ${apiname} ${opname} pthread ${TensorFlow_LIBRARY} rt coverage_config)
 endif()
 
 add_test( runUnitTests runUnitTests )
 
 find_package(GTest)
-if(NOT GTEST_LIBRARY)
+if(NOT GTEST_LIBRARIES)
   configure_file(../../cmake/googletest.cmake.in googletest-download/CMakeLists.txt)
   execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
     RESULT_VARIABLE result

source/install/test_cc_local.sh

@@ -0,0 +1,33 @@
+set -e
+
+#------------------
+
+SCRIPT_PATH=$(dirname $(realpath -s $0))
+NPROC=$(nproc --all)
+
+#------------------
+
+BUILD_TMP_DIR=${SCRIPT_PATH}/../build_tests
+mkdir -p ${BUILD_TMP_DIR}
+cd ${BUILD_TMP_DIR}
+cmake ../lib/tests
+make -j${NPROC}
+
+#------------------
+${BUILD_TMP_DIR}/runUnitTests
+
+
+#------------------
+
+echo "try to find tensorflow in ${tensorflow_root}"
+BUILD_TMP_DIR=${SCRIPT_PATH}/../build_cc_tests
+INSTALL_PREFIX=${SCRIPT_PATH}/../../dp
+mkdir -p ${BUILD_TMP_DIR}
+mkdir -p ${INSTALL_PREFIX}
+cd ${BUILD_TMP_DIR}
+cmake -DINSTALL_TENSORFLOW=FALSE -DTENSORFLOW_ROOT=${tensorflow_root} ../api_cc/tests
+make -j${NPROC}
+
+#------------------
+cd ${SCRIPT_PATH}/../api_cc/tests
+${BUILD_TMP_DIR}/runUnitTests

source/lib/tests/CMakeLists.txt

@@ -87,7 +87,7 @@ add_test( runUnitTests runUnitTests )
 # )
 
 find_package(GTest)
-if(NOT GTEST_LIBRARY)
+if(NOT GTEST_LIBRARIES)
   configure_file(../../cmake/googletest.cmake.in googletest-download/CMakeLists.txt)
   execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
     RESULT_VARIABLE result