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| author | Reuben Thomas <rrt@sc3d.org> | 2019-05-16 22:12:25 +0100 |
|---|---|---|
| committer | Reuben Thomas <rrt@sc3d.org> | 2019-05-16 22:12:25 +0100 |
| commit | 19e02953b3eb27778a7c3961a16883ec16207c24 (patch) | |
| tree | d2b46ab6d8c11c12a961f880a1282539b190e021 /m4/ax_int128.m4 | |
| parent | 92aa35374c4925056289515997d14af100280348 (diff) | |
| download | autoconf-archive-19e02953b3eb27778a7c3961a16883ec16207c24.tar.gz | |
ax_int128.m4: new macro AX_HAVE_INT128
Diffstat (limited to 'm4/ax_int128.m4')
| -rw-r--r-- | m4/ax_int128.m4 | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/m4/ax_int128.m4 b/m4/ax_int128.m4 new file mode 100644 index 0000000..a6c848a --- /dev/null +++ b/m4/ax_int128.m4 @@ -0,0 +1,44 @@ +# ============================================================= +# 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. +# TODO: 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 1 + +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 +]) |