fix ci

Author: wuxianrong

.github/workflows/pika.yml

@@ -36,15 +36,18 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y autoconf libprotobuf-dev protobuf-compiler clang-tidy
 
+      - name: Check CMake version
+        run: cmake --version 
+
       - name: Configure CMake
         # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
         # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
-        run: cmake -B build -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} -DUSE_PIKA_TOOLS=ON -DCMAKE_CXX_FLAGS_DEBUG=-fsanitize=address -D CMAKE_C_COMPILER_LAUNCHER=ccache -D CMAKE_CXX_COMPILER_LAUNCHER=ccache
+        run: cmake -DCMAKE_POLICY_VERSION_MINIMUM=3.5 -B build -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} -DUSE_PIKA_TOOLS=ON -DCMAKE_CXX_FLAGS_DEBUG=-fsanitize=address -D CMAKE_C_COMPILER_LAUNCHER=ccache -D CMAKE_CXX_COMPILER_LAUNCHER=ccache
 
       - name: Build
         # Build your program with the given configuration
         run: cmake --build build --config ${{ env.BUILD_TYPE }}
-
+       
       - name: Cleanup
         run: |
           rm -rf  ./deps

CMakeLists.txt

@@ -190,7 +190,7 @@ ExternalProject_Add(gflags
   1
   BUILD_ALWAYS
   1
-  CMAKE_ARGS
+  CMAKE_ARGS 
   -DCMAKE_INSTALL_PREFIX=${STAGED_INSTALL_PREFIX}
   -DCMAKE_BUILD_TYPE=${LIB_BUILD_TYPE}
   -DGFLAGS_NAMESPACE=gflags