m4/uintmax_t.m4

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