m4/sd_check_max_int_size.m4

   1 dnl Find what INT_MAX define to use for a type
   2
   3 #serial 1
   4
   5 ifdef([AC_TR_SH],[], [
   6 define([AC_TR_SH],
   7        [patsubst(translit([[$1]], [*+], [pp]), [[^a-zA-Z0-9_]], [_])])
   8 define([AC_TR_CPP],
   9        [patsubst(translit([[$1]],
  10                           [*abcdefghijklmnopqrstuvwxyz],
  11                           [PABCDEFGHIJKLMNOPQRSTUVWXYZ]),
  12                  [[^A-Z0-9_]], [_])])
  13 ])
  14
  15 AC_DEFUN([SD_CHECK_MAX_INT_SIZE],
  16         [AC_CHECK_SIZEOF([long],,)
  17          AC_CHECK_SIZEOF([long long],,)
  18          AC_CHECK_SIZEOF([$1],,[$2])
  19          AS_CASE([$ac_cv_sizeof_[]AC_TR_SH($1)],
  20                  [$ac_cv_sizeof_long], [sd_type_max=LONG_MAX],
  21                  [$ac_cv_sizeof_long_long], [sd_type_max=LONG_LONG_MAX],
  22                  [AC_MSG_ERROR([Don't know how to map $1 to an integer])])
  23          AC_DEFINE_UNQUOTED(AC_TR_CPP($1_MAX), [$sd_type_max],
  24                    [what int to use to maximize $1])
  25          AC_MSG_CHECKING([what int to to use to maximize $1])
  26          AC_MSG_RESULT([$sd_type_max])
  27 ])