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cmake_minimum_required(VERSION 3.13...3.28)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CORE_DIR ${CMAKE_CURRENT_LIST_DIR}/..)
set(DEP_DIR ${CORE_DIR}/../deps CACHE PATH "Dependencies")
option(USE_MBEDTLS "Use mbed TLS instead of OpenSSL")
option(USE_WERROR "Treat compiler warnings as errors (-Werror)")
option(USE_WCONVERSION "Enable -Wconversion")
if (DEFINED ENV{DEP_DIR})
message("Overriding DEP_DIR setting with environment variable $ENV{DEP_DIR}")
set(DEP_DIR $ENV{DEP_DIR})
endif ()
# Include our DEP_DIR in path used to find libraries
if (APPLE)
set(OPENVPN_PLAT osx)
elseif (WIN32)
set(OPENVPN_PLAT amd64)
else ()
set(OPENVPN_PLAT linux)
endif ()
function(add_ssl_library target)
if (${USE_MBEDTLS})
find_package(mbedTLS REQUIRED)
set(SSL_LIBRARY mbedTLS::mbedTLS)
target_compile_definitions(${target} PRIVATE -DUSE_MBEDTLS)
else ()
find_package(OpenSSL REQUIRED)
SET(SSL_LIBRARY OpenSSL::SSL)
target_compile_definitions(${target} PRIVATE -DUSE_OPENSSL)
endif ()
target_link_libraries(${target} ${SSL_LIBRARY})
endfunction()
function(add_core_dependencies target)
set(PLAT ${OPENVPN_PLAT})
target_include_directories(${target} PRIVATE ${CORE_DIR})
target_compile_definitions(${target} PRIVATE
-DASIO_STANDALONE
-DUSE_ASIO
-DHAVE_LZ4
#-DMBEDTLS_DEPRECATED_REMOVED # with mbed TLS 3.0 we currently still need the deprecated APIs
)
if (WIN32)
target_compile_definitions(${target} PRIVATE
-D_WIN32_WINNT=0x0600
-DTAP_WIN_COMPONENT_ID=tap0901
-D_CRT_SECURE_NO_WARNINGS
-DASIO_DISABLE_LOCAL_SOCKETS
)
set(EXTRA_LIBS fwpuclnt.lib iphlpapi.lib wininet.lib setupapi.lib rpcrt4.lib wtsapi32.lib)
if ("${CMAKE_GENERATOR_PLATFORM}" STREQUAL "ARM64")
# by some reasons CMake doesn't add those for ARM64
list(APPEND EXTRA_LIBS advapi32.lib Ole32.lib Shell32.lib)
endif ()
if (MSVC)
target_compile_options(${target} PRIVATE "/bigobj")
else ()
find_package(Threads REQUIRED)
target_compile_options(${target} PRIVATE "-Wa,-mbig-obj")
list(APPEND EXTRA_LIBS ws2_32 wsock32 ${CMAKE_THREAD_LIBS_INIT})
list(APPEND CMAKE_PREFIX_PATH
${DEP_DIR}/asio/asio
${DEP_DIR}
)
endif ()
else ()
list(APPEND CMAKE_PREFIX_PATH
${DEP_DIR}/asio/asio
${DEP_DIR}/lz4/lz4-${PLAT}
${DEP_DIR}/mbedtls/mbedtls-${PLAT}
)
list(APPEND CMAKE_LIBRARY_PATH
${DEP_DIR}/mbedtls/mbedtls-${PLAT}/library
)
endif ()
# asio should go first since some of our code requires
# a patched version. So we want to prefer its include
# directories.
find_package(asio REQUIRED)
target_link_libraries(${target} asio::asio)
find_package(lz4 REQUIRED)
target_link_libraries(${target} lz4::lz4)
add_ssl_library(${target})
if (APPLE)
find_library(coreFoundation CoreFoundation)
find_library(iokit IOKit)
find_library(coreServices CoreServices)
find_library(systemConfiguration SystemConfiguration)
target_link_libraries(${target} ${coreFoundation} ${iokit} ${coreServices} ${systemConfiguration} ${lz4})
endif()
if(UNIX)
target_link_libraries(${target} pthread)
endif()
target_link_libraries(${target} ${EXTRA_LIBS})
if (USE_WERROR)
if (MSVC)
target_compile_options(${target} PRIVATE /WX)
else ()
target_compile_options(${target} PRIVATE -Werror)
endif ()
endif ()
if (MSVC)
# C4200: nonstandard extension used : zero-sized array in struct/union
# C4146: unary minus operator applied to unsigned type, result still unsigned
target_compile_options(${target} PRIVATE /W3 /wd4200 /wd4146)
else()
target_compile_options(${target} PRIVATE -Wall -Wsign-compare)
if (USE_WCONVERSION)
target_compile_options(${target} PRIVATE -Wconversion -Wno-sign-conversion)
endif()
if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
# disable noisy warnings
target_compile_options(${target} PRIVATE -Wno-maybe-uninitialized)
endif()
if (CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
# display all warnings
target_compile_options(${target} PRIVATE -ferror-limit=0 -Wno-enum-enum-conversion)
endif()
endif()
endfunction()
function (add_json_library target)
find_package(jsoncpp CONFIG)
if (jsoncpp_FOUND AND TARGET JsonCpp::JsonCpp)
target_link_libraries(${target} JsonCpp::JsonCpp)
target_compile_definitions(${target} PRIVATE -DHAVE_JSONCPP)
else()
find_package(PkgConfig REQUIRED)
if (MINGW)
# due to cmake bug, APPEND doesn't work for mingw
# https://github.com/Kitware/CMake/commit/f92a4b23994fa7516f16fbb5b3c02caa07534b3f
set(CMAKE_PREFIX_PATH ${DEP_DIR})
endif ()
pkg_check_modules(JSONCPP REQUIRED IMPORTED_TARGET jsoncpp)
target_link_libraries(${target} PkgConfig::JSONCPP)
target_compile_definitions(${target} PRIVATE -DHAVE_JSONCPP)
endif ()
endfunction ()
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