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cmake: fix when cross compiling (#252) 

To compile protobuf, CMake needs to use the protoc and grpc-cpp-plugin
in the host architecture.

Unfortunately by default the protoc and grpc-cpp-plugin are the one for
the Target.
And since gRPC 1.52 they are explictly not exported when Cross Compiling
to avoid architecture mismatch.
See:
831d2a6855

Fix this by looking at the correct program

See example.
https://github.com/grpc/grpc/blob/master/examples/cpp/cmake/common.cmake#L54-L62

Signed-off-by: Clément Péron <peron.clem@gmail.com>
This commit is contained in:
Clément Péron 2023-09-25 03:49:24 +02:00 committed by GitHub
parent 6fc1f164c0
commit 47f0d9e032
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 26 additions and 2 deletions
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28
CMakeLists.txt
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@ -120,10 +120,34 @@ if(Protobuf_PROTOC_EXECUTABLE)
endif() endif()
endif() endif()
# When cross compiling we look for the native protoc compiler
# overwrite protobuf::protoc with the proper protoc
if(CMAKE_CROSSCOMPILING)
find_program(Protobuf_PROTOC_EXECUTABLE REQUIRED NAMES protoc)
if(NOT TARGET protobuf::protoc)
add_executable(protobuf::protoc IMPORTED)
endif()
set_target_properties(protobuf::protoc PROPERTIES
IMPORTED_LOCATION "${Protobuf_PROTOC_EXECUTABLE}")
endif()
find_package(gRPC QUIET) find_package(gRPC QUIET)
if(gRPC_FOUND AND TARGET gRPC::grpc AND TARGET gRPC::grpc_cpp_plugin) if(gRPC_FOUND AND TARGET gRPC::grpc)
# When cross compiling we look for the native grpc_cpp_plugin
if(CMAKE_CROSSCOMPILING)
find_program(GRPC_CPP_PLUGIN REQUIRED NAMES grpc_cpp_plugin)
if(NOT TARGET gRPC::grpc_cpp_plugin)
add_executable(gRPC::grpc_cpp_plugin IMPORTED)
endif()
set_target_properties(gRPC::grpc_cpp_plugin PROPERTIES
IMPORTED_LOCATION "${GRPC_CPP_PLUGIN}")
elseif(TARGET gRPC::grpc_cpp_plugin)
get_target_property(GRPC_CPP_PLUGIN gRPC::grpc_cpp_plugin LOCATION)
else()
message(FATAL_ERROR "Found gRPC but no gRPC CPP plugin defined")
endif()
set(GRPC_LIBRARIES gRPC::gpr gRPC::grpc gRPC::grpc++) set(GRPC_LIBRARIES gRPC::gpr gRPC::grpc gRPC::grpc++)
get_target_property(GRPC_CPP_PLUGIN gRPC::grpc_cpp_plugin LOCATION)
get_target_property(GRPC_INCLUDE_DIR gRPC::grpc INTERFACE_INCLUDE_DIRECTORIES) get_target_property(GRPC_INCLUDE_DIR gRPC::grpc INTERFACE_INCLUDE_DIRECTORIES)
else() else()
include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/FindGRPC.cmake) include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/FindGRPC.cmake)