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-# ============================================================================
-# https://www.gnu.org/software/autoconf-archive/ax_compile_check_sizeof.html
-# ============================================================================
-#
-# SYNOPSIS
-#
-# AX_COMPILE_CHECK_SIZEOF(TYPE [, HEADERS [, EXTRA_SIZES...]])
-#
-# DESCRIPTION
-#
-# This macro checks for the size of TYPE using compile checks, not run
-# checks. You can supply extra HEADERS to look into. the check will cycle
-# through 1 2 4 8 16 and any EXTRA_SIZES the user supplies. If a match is
-# found, it will #define SIZEOF_`TYPE' to that value. Otherwise it will
-# emit a configure time error indicating the size of the type could not be
-# determined.
-#
-# The trick is that C will not allow duplicate case labels. While this is
-# valid C code:
-#
-# switch (0) case 0: case 1:;
-#
-# The following is not:
-#
-# switch (0) case 0: case 0:;
-#
-# Thus, the AC_COMPILE_IFELSE will fail if the currently tried size does
-# not match.
-#
-# Here is an example skeleton configure.in script, demonstrating the
-# macro's usage:
-#
-# AC_PROG_CC
-# AC_CHECK_HEADERS(stddef.h unistd.h)
-# AC_TYPE_SIZE_T
-# AC_CHECK_TYPE(ssize_t, int)
-#
-# headers='#ifdef HAVE_STDDEF_H
-# #include <stddef.h>
-# #endif
-# #ifdef HAVE_UNISTD_H
-# #include <unistd.h>
-# #endif
-# '
-#
-# AX_COMPILE_CHECK_SIZEOF(char)
-# AX_COMPILE_CHECK_SIZEOF(short)
-# AX_COMPILE_CHECK_SIZEOF(int)
-# AX_COMPILE_CHECK_SIZEOF(long)
-# AX_COMPILE_CHECK_SIZEOF(unsigned char *)
-# AX_COMPILE_CHECK_SIZEOF(void *)
-# AX_COMPILE_CHECK_SIZEOF(size_t, $headers)
-# AX_COMPILE_CHECK_SIZEOF(ssize_t, $headers)
-# AX_COMPILE_CHECK_SIZEOF(ptrdiff_t, $headers)
-# AX_COMPILE_CHECK_SIZEOF(off_t, $headers)
-#
-# LICENSE
-#
-# Copyright (c) 2008 Kaveh Ghazi <ghazi@caip.rutgers.edu>
-# Copyright (c) 2017 Reini Urban <rurban@cpan.org>
-#
-# This program is free software: you can redistribute it and/or modify it
-# under the terms of the GNU General Public License as published by the
-# Free Software Foundation, either version 3 of the License, or (at your
-# option) any later version.
-#
-# This program is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program. If not, see <https://www.gnu.org/licenses/>.
-#
-# As a special exception, the respective Autoconf Macro's copyright owner
-# gives unlimited permission to copy, distribute and modify the configure
-# scripts that are the output of Autoconf when processing the Macro. You
-# need not follow the terms of the GNU General Public License when using
-# or distributing such scripts, even though portions of the text of the
-# Macro appear in them. The GNU General Public License (GPL) does govern
-# all other use of the material that constitutes the Autoconf Macro.
-#
-# This special exception to the GPL applies to versions of the Autoconf
-# Macro released by the Autoconf Archive. When you make and distribute a
-# modified version of the Autoconf Macro, you may extend this special
-# exception to the GPL to apply to your modified version as well.
-
-#serial 8
-
-AU_ALIAS([AC_COMPILE_CHECK_SIZEOF], [AX_COMPILE_CHECK_SIZEOF])
-AC_DEFUN([AX_COMPILE_CHECK_SIZEOF],
-[changequote(<<, >>)dnl
-dnl The name to #define.
-define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl
-dnl The cache variable name.
-define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl
-changequote([, ])dnl
-AC_MSG_CHECKING(size of $1)
-AC_CACHE_VAL(AC_CV_NAME,
-[for ac_size in 4 8 1 2 16 $3 ; do # List sizes in rough order of prevalence.
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-#include <sys/types.h>
-$2
-]], [[switch (0) case 0: case (sizeof ($1) == $ac_size):;]])], [AC_CV_NAME=$ac_size])
- if test x$AC_CV_NAME != x ; then break; fi
-done
-])
-if test x$AC_CV_NAME = x ; then
- AC_MSG_ERROR([cannot determine a size for $1])
-fi
-AC_MSG_RESULT($AC_CV_NAME)
-AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1])
-undefine([AC_TYPE_NAME])dnl
-undefine([AC_CV_NAME])dnl
-])