m4/inttypes.m4

   1 #serial 6
   2
   3 dnl From Paul Eggert.
   4
   5 AC_PREREQ(2.13)
   6
   7 # Define HAVE_INTTYPES_H if <inttypes.h> exists,
   8 # doesn't clash with <sys/types.h>, and declares intmax_t and uintmax_t.
   9
  10 AC_DEFUN([jm_AC_HEADER_INTTYPES_H],
  11 [
  12   AC_CACHE_CHECK([for inttypes.h], jm_ac_cv_header_inttypes_h,
  13   [AC_TRY_COMPILE(
  14     [#include <sys/types.h>
  15 #include <inttypes.h>],
  16     [intmax_t i = (intmax_t) -1; uintmax_t ui = (uintmax_t) -1;],
  17     jm_ac_cv_header_inttypes_h=yes,
  18     jm_ac_cv_header_inttypes_h=no)])
  19   if test $jm_ac_cv_header_inttypes_h = yes; then
  20     AC_DEFINE_UNQUOTED(HAVE_INTTYPES_H, 1,
  21 [Define if <inttypes.h> exists, doesn't clash with <sys/types.h>,
  22    and declares intmax_t and uintmax_t.])
  23   fi
  24 ])
  25
  26 # Define intmax_t to long or long long if <inttypes.h> doesn't define.
  27
  28 AC_DEFUN([jm_AC_TYPE_INTMAX_T],
  29 [
  30   AC_REQUIRE([jm_AC_HEADER_INTTYPES_H])
  31   if test $jm_ac_cv_header_inttypes_h = no; then
  32     AC_REQUIRE([jm_AC_TYPE_LONG_LONG])
  33     test $ac_cv_type_long_long = yes \
  34       && ac_type='long long' \
  35       || ac_type='long'
  36     AC_DEFINE_UNQUOTED(intmax_t, $ac_type,
  37       [Define to long or long long if <inttypes.h> doesn't define.])
  38   fi
  39 ])
  40
  41 # Define uintmax_t to unsigned long or unsigned long long
  42 # if <inttypes.h> doesn't define.
  43
  44 AC_DEFUN([jm_AC_TYPE_UINTMAX_T],
  45 [
  46   AC_REQUIRE([jm_AC_HEADER_INTTYPES_H])
  47   if test $jm_ac_cv_header_inttypes_h = no; then
  48     AC_REQUIRE([jm_AC_TYPE_UNSIGNED_LONG_LONG])
  49     test $ac_cv_type_unsigned_long_long = yes \
  50       && ac_type='unsigned long long' \
  51       || ac_type='unsigned long'
  52     AC_DEFINE_UNQUOTED(uintmax_t, $ac_type,
  53 [Define to unsigned long or unsigned long long
  54    if <inttypes.h> doesn't define.])
  55   fi
  56 ])