Link external library (steamapi) by path with cmake - c++

Question

I am trying to link Steam API with cmake.
I've tried Googling it, and there is close to nothing on steamapi cmake. In my case the Steam SDK is stored in C:/Users/user/Documents/Visual Studio 2022/Libraries/steam-sdk/.
This is my broken cmake:
# Project
cmake_minimum_required (VERSION 3.14)
project (MyProject)
#target_include_directories(${PROJECT_NAME} PUBLIC "C:/Users/user/Documents/Visual Studio 2022/Libraries/steam-sdk/public/steam/")
#target_link_directories(${PROJECT_NAME} PUBLIC "C:/Users/user/Documents/Visual Studio 2022/Libraries/steam-sdk/redistributable_bin/win64/")
#add_library(steamapi SHARED IMPORTED) # or STATIC instead of SHARED
#set_target_properties(bar PROPERTIES
# IMPORTED_LOCATION "${CMAKE_SOURCE_DIR}/lib/libbar.so"
# INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_SOURCE_DIR}/include/libbar"
#)
find_library(
steamapi
#external_library_dependency
#external_library_name
PATHS "C:/Users/user/Documents/Visual Studio 2022/Libraries/steam-sdk/" # you can manually provide a path to search for your library if its not in the PATH
#PATH_SUFFIXES "/redistributable_bin/win64/" # possible subfolders inside the top directory of your library
PATH_SUFFIXES "/redistributable_bin" "/redistributable_bin/win64" # possible subfolders inside the top directory of your library
)
#find_library(steamapi "steam_api64.lib" PATHS "C:/Users/Rico/Documents/Visual Studio 2022/Libraries/steam-sdk/redistributable_bin/win64/")
#target_include_directories(${PROJECT_NAME} PUBLIC "C:/Users/Rico/Documents/Visual Studio 2022/Libraries/steam-sdk/public/steam/")
include_directories(${steamapi_INCLUDE_DIRS})
# Linking
add_executable(${PROJECT_NAME}
"src/Main.cpp"
)
target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_20)
target_link_libraries(${PROJECT_NAME}
steamapi
)
How can I do this?

Answer 1

I would end up with a solution similar to CPM.cmake for hands-free installation
# get_steamapi.cmake (located in myproject/cmake)
set(STEAMAPI_ZIP_LOCATION "${CMAKE_BINARY_DIR}/cmake/steamworks_sdk.zip")
set(STEAMAPI_LOCATION "${CMAKE_BINARY_DIR}/cmake/steamworks_sdk")
set(STEAMAPI_BINARY_DIR "${STEAMAPI_LOCATION}/sdk/redistributable_bin/win64/steam_api64.lib")
set(STEAMAPI_SOURCE_DIR "${STEAMAPI_LOCATION}/sdk/public/steam")
set(STEAMAPI_SHARED_DIR "${STEAMAPI_LOCATION}/sdk/redistributable_bin/win64/steam_api64.dll")
#set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
if(NOT (EXISTS ${STEAMAPI_ZIP_LOCATION}))
message(STATUS "Downloading Steam SDK to ${STEAMAPI_ZIP_LOCATION}")
file(DOWNLOAD
https://partner.steamgames.com/downloads/steamworks_sdk.zip
${STEAMAPI_ZIP_LOCATION}
)
endif()
if(NOT(EXISTS ${STEAMAPI_LOCATION}))
message(STATUS "Unzipping Steam SDK to ${STEAMAPI_ZIP_LOCATION}")
file(ARCHIVE_EXTRACT INPUT ${STEAMAPI_ZIP_LOCATION} DESTINATION ${STEAMAPI_LOCATION})
endif()
#include(${STEAMAPI_ZIP_LOCATION})
The CMakeLists.txt
#CMakeLists.txt
# Project
cmake_minimum_required (VERSION 3.14)
project (MyProject)
set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake)
include(get_steamapi)
# Libraries
find_package(Threads REQUIRED)
# Linking
add_executable(${PROJECT_NAME}
"src/Main.cpp"
)
target_include_directories(${PROJECT_NAME}
PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include
PUBLIC ${STEAMAPI_SOURCE_DIR}
#PUBLIC "C:/Users/user/Documents/Visual Studio 2022/Libraries/steam-sdk/public/steam"
)
target_compile_features(${PROJECT_NAME} PRIVATE cxx_std_20)
target_link_libraries(${PROJECT_NAME}
PRIVATE Threads::Threads
PUBLIC ${STEAMAPI_BINARY_DIR}
#"C:/Users/user/Documents/Visual Studio 2022/Libraries/steam-sdk/redistributable_bin/win64/steam_api64.lib"
)
file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/steam_appid.txt
DESTINATION ${CMAKE_CURRENT_BINARY_DIR})
file(COPY ${STEAMAPI_SHARED_DIR}
DESTINATION ${CMAKE_CURRENT_BINARY_DIR}
)
The commented out portions also work but I think the method I came up with is pretty neat.