1enable_language(C) 2 3if(NOT CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "x86_64") 4 message(FATAL_ERROR "CMAKE_HOST_SYSTEM_PROCESSOR is '${CMAKE_HOST_SYSTEM_PROCESSOR}', not 'x86_64'") 5endif() 6if(NOT CMAKE_OSX_ARCHITECTURES STREQUAL "") 7 message(FATAL_ERROR "CMAKE_OSX_ARCHITECTURES is '${CMAKE_OSX_ARCHITECTURES}', not empty ''") 8endif() 9 10add_library(x86_64 x86_64.c) 11