cmake/modules/GMPLimbSize.cmake

   1
   2 include(CheckCXXSourceCompiles)
   3
   4 set(_save_required_libraries ${CMAKE_REQUIRED_LIBRARIES})
   5 set(_save_required_includes ${CMAKE_REQUIRED_INCLUDES})
   6 set(CMAKE_REQUIRED_LIBRARIES "${GMP_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES}")
   7 set(CMAKE_REQUIRED_INCLUDES "${GMP_INCLUDE_DIR} ${CMAKE_REQUIRED_INCLUDES}")
   8
   9 CHECK_CXX_SOURCE_COMPILES("
  10         #include <gmp.h>
  11         template<bool COND> struct Static_Assert;
  12         template<> struct Static_Assert<true> { };
  13         #if defined(__GMP_BITS_PER_MP_LIB)
  14         Static_Assert<8*sizeof(mp_limb_t) == __GMP_BITS_PER_MP_LIB> check;
  15         int main() { return 0; }
  16         #endif
  17         "
  18         cl_gmp_has_nails
  19 )
  20 if (${cl_gmp_has_nails})
  21     message(SEND_ERROR "nails in MP limbs are not supported.")
  22 endif()
  23
  24 CHECK_CXX_SOURCE_COMPILES("
  25         #include <gmp.h>
  26         template<bool COND> struct Static_Assert;
  27         template<> struct Static_Assert<true> { };
  28         Static_Assert<sizeof(mp_limb_t) == sizeof(long)> check;
  29         int main() { return 0; }
  30         "
  31         mp_limb_t_is_long
  32 )
  33
  34 CHECK_CXX_SOURCE_COMPILES("
  35         #include <gmp.h>
  36         template<bool COND> struct Static_Assert;
  37         template<> struct Static_Assert<true> { };
  38         Static_Assert<sizeof(mp_limb_t) == sizeof(long long)> check;
  39         int main() { return 0; }
  40         "
  41         mp_limb_t_is_long_long
  42 )
  43 set(CMAKE_REQUIRED_INCLUDES ${_save_required_includes})
  44 set(CMAKE_REQUIRED_LIBRARIES ${_save_required_libraries})
  45
  46 if (mp_limb_t_is_long)
  47     message(STATUS "sizeof(mp_limb_t) == sizeof(long)")
  48     set(GMP_DEMANDS_UINTD_LONG 1 CACHE INTERNAL "sizeof(mp_limb_t) == sizeof(long)")
  49 else (mp_limb_t_is_long)
  50     if (mp_limb_t_is_long_long)
  51         message(STATUS "sizeof(mp_limb_t) == sizeof(long long)")
  52         set(GMP_DEMANDS_UINTD_LONG_LONG 1 CACHE INTERNAL "sizeof(mp_limb_t) == sizeof(long long)")
  53     else()
  54         message(SEND_ERROR "Don't know which C integer type has sizeof(mp_limb_t)")
  55     endif()
  56 endif (mp_limb_t_is_long)