Cmake CPM link with GameNetworkingSockets - c++

Question

I am trying to link Valves GameNetworkingSockets with my c++ cmake project, and am having errors (first failed to compile due to missing defines when I was able to include the headers, later errors were due to unrecognized targets...). I am using the CPM module for package installing. Below is my cmake:
# Basic settings
cmake_minimum_required (VERSION 3.14)
project (Valhalla)
set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
include(get_cpm)
if (NOT CMAKE_BUILD_TYPE)
SET(CMAKE_BUILD_TYPE Release)
endif()
############
# LIBRARIES
############
CPMAddPackage(
NAME gamenetworkingsockets
GITHUB_REPOSITORY ValveSoftware/GameNetworkingSockets
#VERSION 3.11.3
GIT_TAG v1.4.1
DOWNLOAD_ONLY TRUE
OPTIONS
CONFIG REQUIRED
"USE_STEAMWEBRTC ON"
"Protobuf_USE_STATIC_LIBS ON"
)
##add_library(lua STATIC ${Lua_sources})
#add_library(steamnet STATIC ${gamenetworkingsockets_sources})
add_library(gamenetworkingsockets INTERFACE)
target_compile_definitions(gamenetworkingsockets INTERFACE STEAMNETWORKINGSOCKETS_STATIC_LINK)
target_include_directories(gamenetworkingsockets SYSTEM INTERFACE ${gamenetworkingsockets_SOURCE_DIR}/include)
#target_include_directories(gamenetworkingsockets PUBLIC ${gamenetworkingsockets_SOURCE_DIR}/include)
#target_include_directories(gamenetworkingsockets PUBLIC ${gamenetworkingsockets_BINARY_DIR})
#target_compile_definitions(gamenetworkingsockets PUBLIC STEAMNETWORKINGSOCKETS_STATIC_LINK)
#target_include_directories(gamenetworkingsockets SYSTEM INTERFACE ${gamenetworkingsockets_SOURCE_DIR}/include)
#target_include_directories(gamenetworkingsockets SYSTEM INTERFACE ${gamenetworkingsockets_BINARY_DIR}/include)
#target_include_directories(gamenetworkingsockets PRIVATE ${gamenetworkingsockets_INCLUDE_DIR})
#
# Linking
#
add_executable(Valhalla
"src/Main.cpp"
)
target_include_directories(Valhalla PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
target_compile_features(Valhalla PRIVATE cxx_std_20)
target_link_libraries(Valhalla
#gamenetworkingsockets
#GameNetworkingSockets::shared
#steamnet::steamnet_s
#GameNetworkingSockets::GameNetworkingSockets_s
#GameNetworkingSockets::static
#GameNetworkingSockets::GameNetworkingSockets_s
)
set_target_properties(Valhalla PROPERTIES
VS_DEBUGGER_WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/run/
CXX_EXTENSIONS OFF
CXX_STANDARD_REQUIRED ON
)
if (MSVC)
target_compile_options(Valhalla PRIVATE /bigobj "/diagnostics:caret")
endif()
if(MSVC AND CMAKE_BUILD_TYPE MATCHES Release)
set_target_properties(Valhalla PROPERTIES WIN32_EXECUTABLE ON)
endif()
The Cmake above has been stripped to a mostly minimal portion for reproducibility. As you can see, there are many commented-out commands as I have tried to brute force ways of making this work to no avail. I found this Linking with GameNetworkingSockets library on Windows gives "unresolved external" error which doesn't help.
#include <steam/steamnetworkingsockets.h>
int main(int argc, char **argv) {
SteamNetworkingIdentity identity;
identity.ParseString("str:peer-server");
return 0;
}
I have no clue how to interface vcpkg with Cmake from MSVC, and I really do not know how to fix this. Any clues as to how I can get everything to link and eventually compile correctly?

Answer 1

So I found out how to use vcpkg.
Install vcpkg
git clone https://github.com/microsoft/vcpkg
.\vcpkg\bootstrap-vcpkg.bat
Update it with
git pull
Make libraries installed with vcpkg recognizable by msvc
.\vcpkg\vcpkg integrate install
Install GameNetworkingSockets and required Protobuf with
.\vcpkg\vcpkg install GameNetworkingSockets --triplet=x64-windows
.\vcpkg\vcpkg install protobuf --triplet=x64-windows
cmakelists.txt in msvc
# Project
cmake_minimum_required (VERSION 3.14)
project (MyProject)
# Libraries
find_package(protobuf CONFIG REQUIRED)
find_package(GameNetworkingSockets CONFIG REQUIRED)
# Linking
add_executable(${PROJECT_NAME}
"src/Main.cpp"
)
target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_20)
target_link_libraries(${PROJECT_NAME}
PRIVATE GameNetworkingSockets::static GameNetworkingSockets::GameNetworkingSockets
PRIVATE protobuf::libprotobuf
)
Try this simple script
// main.cpp
#include <steam/steamnetworkingsockets.h>
int main(void) {
SteamNetworkingIdentity identity;
identity.ParseString("str:peer-server");
return 0;
}
The above should compile fine if everything worked