m4/uintmax_t.m4

   1 #serial 2
   2
   3 dnl From Paul Eggert.
   4
   5 AC_PREREQ(2.13)
   6
   7 # Define uintmax_t to `unsigned long' or `unsigned long long'
   8 # if <inttypes.h> does not exist.
   9
  10 AC_DEFUN(jm_AC_TYPE_UINTMAX_T,
  11 [
  12   AC_REQUIRE([jm_AC_HEADER_INTTYPES_H])
  13   if test $jm_ac_cv_header_inttypes_h = no; then
  14     AC_CACHE_CHECK([for unsigned long long], ac_cv_type_unsigned_long_long,
  15     [AC_TRY_COMPILE([],
  16       [unsigned long long i = (unsigned long long) -1;],
  17       ac_cv_type_unsigned_long_long=yes,
  18       ac_cv_type_unsigned_long_long=no)])
  19     test $ac_cv_type_unsigned_long_long = yes \
  20       && ac_type='unsigned long long' \
  21       || ac_type='unsigned long'
  22     AC_DEFINE_UNQUOTED(uintmax_t, $ac_type,
  23 [  Define to \`unsigned long' or \`unsigned long long'
  24    if <inttypes.h> doesn't define.])
  25   fi
  26 ])