# determine compiler
if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  set(CMAKE_COMPILER_IS_CLANG TRUE)
endif()

# determine the target arch

if (CROSS_COMPILE_AARCH64)
  set(ARCH_AARCH64 TRUE)
  set(ARCH_64_BIT TRUE)
  message(STATUS "Cross compiling for aarch64")
else()
  # really only interested in the preprocessor here
  CHECK_C_SOURCE_COMPILES("#if !(defined(__x86_64__) || defined(_M_X64))\n#error not 64bit\n#endif\nint main(void) { return 0; }" ARCH_X86_64)
  CHECK_C_SOURCE_COMPILES("#if !(defined(__i386__) || defined(_M_IX86))\n#error not 32bit\n#endif\nint main(void) { return 0; }" ARCH_IA32)
  CHECK_C_SOURCE_COMPILES("#if !defined(__ARM_ARCH_ISA_A64)\n#error not 64bit\n#endif\nint main(void) { return 0; }" ARCH_AARCH64)
  CHECK_C_SOURCE_COMPILES("#if !defined(__ARM_ARCH_ISA_ARM)\n#error not 32bit\n#endif\nint main(void) { return 0; }" ARCH_ARM32)
  CHECK_C_SOURCE_COMPILES("#if !defined(__PPC64__) && !(defined(__LITTLE_ENDIAN__) && defined(__VSX__))\n#error not ppc64el\n#endif\nint main(void) { return 0; }" ARCH_PPC64EL)
  if (ARCH_X86_64 OR ARCH_AARCH64 OR ARCH_PPC64EL)
    set(ARCH_64_BIT TRUE)
  else()
    set(ARCH_32_BIT TRUE)
  endif()
endif()