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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_define_integer_bits.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_DEFINE_INTEGER_BITS (TYPE [, CANDIDATE-TYPE]...)
#
# DESCRIPTION
#
# Given a TYPE of the form "int##_t" or "uint##_t", see if the datatype
# TYPE is predefined. If not, then define TYPE -- both with AC_DEFINE and
# as a shell variable -- to the first datatype of exactly ## bits in a
# list of CANDIDATE-TYPEs. If none of the CANDIDATE-TYPEs contains exactly
# ## bits, then set the TYPE shell variable to "no".
#
# For example, the following ensures that uint64_t is defined as a 64-bit
# datatype:
#
# AX_DEFINE_INTEGER_BITS(uint64_t, unsigned long long, unsigned __int64, long)
# if test "$uint64_t" = no; then
# AC_MSG_ERROR([unable to continue without a 64-bit datatype])
# fi
#
# You should then put the following in your C code to ensure that all
# datatypes defined by AX_DEFINE_INTEGER_BITS are visible to your program:
#
# #include "config.h"
#
# #if HAVE_INTTYPES_H
# # include <inttypes.h>
# #else
# # if HAVE_STDINT_H
# # include <stdint.h>
# # endif
# #endif
#
# LICENSE
#
# Copyright (c) 2008 Scott Pakin <pakin@uiuc.edu>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 7
AU_ALIAS([AC_DEFINE_INTEGER_BITS], [AX_DEFINE_INTEGER_BITS])
AC_DEFUN([AX_DEFINE_INTEGER_BITS],
[m4_define([ac_datatype_bits], [m4_translit($1, [a-zA-Z_])])
m4_define([ac_datatype_bytes], [m4_eval(ac_datatype_bits/8)])
AC_CHECK_TYPE($1, ,
[
AC_MSG_NOTICE([trying to find a suitable ]ac_datatype_bytes[-byte replacement for $1])
$1=no
find_$1 ()
{
_AX_DEFINE_INTEGER_BITS_HELPER($@)
:
}
find_$1
AC_DEFINE_UNQUOTED($1, $$1,
[If not already defined, then define as a datatype of *exactly* ]ac_datatype_bits[ bits.])
])
])
dnl Iterate over arguments $2..$N, trying to find a good match for $1.
m4_define([_AX_DEFINE_INTEGER_BITS_HELPER],
[ifelse($2, , ,
[m4_define([ac_datatype_bits], [m4_translit($1, [a-zA-Z_])])
m4_define([ac_datatype_bytes], [m4_eval(ac_datatype_bits/8)])
AC_CHECK_SIZEOF($2)
if test "$AS_TR_SH(ac_cv_sizeof_$2)" -eq ac_datatype_bytes; then
$1="$2"
return
fi
_AX_DEFINE_INTEGER_BITS_HELPER($1, m4_shift(m4_shift($@)))
])
])
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