vcpkg/scripts/toolchains/osx.cmake

if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
    set(CMAKE_CROSSCOMPILING OFF CACHE BOOL "")

    set(CMAKE_SYSTEM_VERSION "${CMAKE_HOST_SYSTEM_VERSION}" CACHE STRING "")
    set(CMAKE_SYSTEM_PROCESSOR "${CMAKE_HOST_SYSTEM_PROCESSOR}" CACHE STRING "")
else()
    set(CMAKE_SYSTEM_VERSION "17.0.0" CACHE STRING "")
    set(CMAKE_SYSTEM_PROCESSOR "x86_64" CACHE STRING "")
endif()
set(CMAKE_SYSTEM_NAME Darwin CACHE STRING "")

set(CMAKE_MACOSX_RPATH ON CACHE BOOL "")

get_property( _CMAKE_IN_TRY_COMPILE GLOBAL PROPERTY IN_TRY_COMPILE )
if(NOT _CMAKE_IN_TRY_COMPILE)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${VCPKG_CXX_FLAGS} -fPIC" CACHE STRING "")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${VCPKG_C_FLAGS} -fPIC" CACHE STRING "")

    set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} ${VCPKG_CXX_FLAGS_DEBUG}" CACHE STRING "")
    set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} ${VCPKG_C_FLAGS_DEBUG}" CACHE STRING "")
    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${VCPKG_CXX_FLAGS_RELEASE}" CACHE STRING "")
    set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} ${VCPKG_C_FLAGS_RELEASE}" CACHE STRING "")

    set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} ${VCPKG_LINKER_FLAGS}" CACHE STRING "")
    set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} ${VCPKG_LINKER_FLAGS}" CACHE STRING "")
endif()