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[PING][PATCH v1.1] Add int128 detection
- From: OndÅej BÃlka <neleai at seznam dot cz>
- To: Roland McGrath <roland at hack dot frob dot com>
- Cc: libc-alpha at sourceware dot org
- Date: Wed, 5 Mar 2014 18:32:57 +0100
- Subject: [PING][PATCH v1.1] Add int128 detection
- Authentication-results: sourceware.org; auth=none
- References: <20140221143228 dot GA11081 at domone dot podge> <20140221175706 dot DB67E7449E at topped-with-meat dot com> <20140224150122 dot GA6178 at domone dot podge>
Ping
On Mon, Feb 24, 2014 at 04:01:22PM +0100, OndÅej BÃlka wrote:
> On Fri, Feb 21, 2014 at 09:57:06AM -0800, Roland McGrath wrote:
> > Use AC_CACHE_CHECK.
>
> Here.
>
> * config.h.in (HAVE_INT128): New macro.
> * configure.ac: Add HAVE_INT128 check.
>
> diff --git a/config.h.in b/config.h.in
> index 40797e7..efb8f19 100644
> --- a/config.h.in
> +++ b/config.h.in
> @@ -192,6 +192,10 @@
> /* Define if STT_GNU_IFUNC support actually works. */
> #undef HAVE_IFUNC
>
> +/* Define if int128 type is usable. */
> +#undef HAVE_INT128
> +
> +
> /* Define if linux/fanotify.h is available. */
> #undef HAVE_LINUX_FANOTIFY_H
>
> diff --git a/configure.ac b/configure.ac
> index f3dd87d..b49c586 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -2114,6 +2114,19 @@ if test "x$build_nscd" = xdefault; then
> build_nscd=$use_nscd
> fi
>
> +
> +AC_CACHE_CHECK(if compiler supports __int128,libc_cv_have_int128,[dnl,
> + AC_TRY_COMPILE([#include <stdint.h>],
> + [ __int128 a = 0;
> + unsigned __int128 b = 1;
> + a = a + b;
> + a = a * b;
> + return 0;], libc_cv_have_int128=yes, libc_cv_have_int128=no)])
> +
> +if test "x$libc_cv_have_int128" = xyes; then
> + AC_DEFINE([HAVE_INT128])
> +fi
> +
> # Test for old glibc 2.0.x headers so that they can be removed properly
> # Search only in includedir.
> AC_MSG_CHECKING(for old glibc 2.0.x headers)