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# ===========================================================================
# https://www.gnu.org/software/autoconf-archive/ax_int128.html
# ===========================================================================
#
# SYNOPSIS
#
# AX_HAVE_INT128
#
# DESCRIPTION
#
# Check whether the compiler provides __int128. If so, define HAVE_INT128.
#
# Works with GCC >= 4.6.
#
# TODO: Provide int128[u]_t & work with other compilers.
#
# LICENSE
#
# Copyright (c) 2019 Reuben Thomas <rrt@sc3d.org>
#
# 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 2
AC_DEFUN([AX_HAVE_INT128],
[
dnl First test whether we already found it.
AC_CACHE_CHECK([for __int128], [ax_cv_int128], [
ax_cv_int128=
AC_EGREP_CPP([Found it], [
#ifdef __SIZEOF_INT128__
Found it
#endif
], [ax_cv_int128=yes])
])
if test "$ax_cv_int128" = yes; then
AC_DEFINE([HAVE_INT128], [1],
[Define to 1 if you have the type __int128.])
fi
])
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