cmake HAVE_SHADOW examples

mysql/mysql-router ext/protobuf/CMakeLists.txt :75 

CHECK_CXX_COMPILER_FLAG("-Wshadow" HAVE_SHADOW)

mysql/mysql-router ext/yassl/CMakeLists.txt :73 

CHECK_CXX_COMPILER_FLAG("-Wshadow" HAVE_SHADOW)

mysql/mysql-router src/mock_server/src/CMakeLists.txt :45 

check_cxx_compiler_flag("-Wshadow" HAVE_SHADOW)

mysql/mysql-router src/plugin_info/CMakeLists.txt :30 

check_cxx_compiler_flag("-Wshadow" HAVE_SHADOW)

mysql/mysql-router src/plugin_info/tests/CMakeLists.txt :32 

check_cxx_compiler_flag("-Wshadow" HAVE_SHADOW)