!60 use c++17 to fix build error

From: @eaglegai 
Reviewed-by: @kircher 
Signed-off-by: @kircher

grpc.spec

@@ -1,9 +1,10 @@
 %global c_so_version 28
 %global cpp_so_version 1.50
+%global cpp_std 17
 
 Name:          grpc
 Version:       1.50.1
-Release:       1
+Release:       2
 Summary:       A modern, open source high performance RPC framework that can run in any environment
 License:       ASL 2.0
 URL:           https://www.grpc.io
@@ -59,11 +60,18 @@ sed -i 's:$(prefix)/lib:$(prefix)/%{_lib}:' Makefile
 sed -i 's:^GTEST_LIB =.*::' Makefile
 #avoid downloading
 mkdir  %{_builddir}/%{name}-%{version}/third_party/opencensus-proto/src
+sed -r -i 's/(std=c\+\+)14/\1%{cpp_std}/g' \
+    setup.py grpc.gyp Rakefile \
+    examples/cpp/*/Makefile \
+    examples/cpp/*/CMakeLists.txt \
+    tools/run_tests/artifacts/artifact_targets.py \
+    tools/distrib/python/grpcio_tools/setup.py
 
 %build
 mkdir -p cmake/build
 cd cmake/build
 cmake ../../ -DgRPC_INSTALL=ON\
+             -DCMAKE_CXX_STANDARD:STRING=%{cpp_std} \
              -DgRPC_CARES_PROVIDER=package \
              -DgRPC_PROTOBUF_PROVIDER=package \
              -DgRPC_SSL_PROVIDER=package      \
@@ -139,6 +147,12 @@ cd ../..
 %{python3_sitearch}/grpcio-%{version}-py*
 
 %changelog
+* Fri Jul 28 2023 eaglegai <eaglegai@163.com> - 1.50.1-2
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:use c++17 to fix build error
+
 * Fri Nov 11 2022 zhouyihang <zhouyihang3@h-partners.com> - 1.50.1-1
 - Type:requirement
 - ID:NA