build: prefer using find_package for gPRC

adding CMAKE_TOOLCHAIN_FILE for source ExternalProject

Author: okhowang

CMakeLists.txt

@@ -55,6 +55,7 @@ ExternalProject_Add(BearSource
             -DCMAKE_CXX_FLAGS:STRING=${CMAKE_CXX_FLAGS}
             -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
             -DPKG_CONFIG_EXECUTABLE:PATH=${PKG_CONFIG_EXECUTABLE}
+            -DCMAKE_TOOLCHAIN_FILE:PATH=${CMAKE_TOOLCHAIN_FILE}
         CMAKE_CACHE_ARGS
             -DCMAKE_PREFIX_PATH:PATH=${CMAKE_PREFIX_PATH}
             -DCMAKE_INSTALL_PREFIX:PATH=${STAGED_INSTALL_PREFIX}

source/CMakeLists.txt

@@ -27,7 +27,13 @@ find_package(nlohmann_json REQUIRED)
 find_package(fmt REQUIRED)
 find_package(spdlog REQUIRED)
 find_package(PkgConfig REQUIRED)
-pkg_check_modules(gRPC REQUIRED IMPORTED_TARGET protobuf grpc++)
+find_package(gRPC)
+if (gRPC_FOUND)
+    set(GRPC_TARGET gRPC::grpc++)
+else ()
+    pkg_check_modules(gRPC REQUIRED IMPORTED_TARGET protobuf grpc++)
+    set(GRPC_TARGET PkgConfig::gRPC)
+endif()
 
 if (UNIX AND NOT APPLE)
     set(SUPPORT_PRELOAD 1)

source/intercept/proto/CMakeLists.txt

@@ -62,4 +62,4 @@ target_sources(rpc_a
         INTERFACE
             $<TARGET_OBJECTS:rpc_a>
         )
-target_link_libraries(rpc_a PUBLIC PkgConfig::gRPC)
+target_link_libraries(rpc_a PUBLIC ${GRPC_TARGET})