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* lib/autoconf/types.m4 (AC_TYPE_LONG_LONG_INT): Detect bug in

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Tandem NonStop Kernel (OSS) cc -O circa 2004, reported by
Matthew Woehlke.
This commit is contained in:
Paul Eggert 2006-11-08 06:25:34 +00:00
parent a015d2f327
commit 4bb5b9260b
2 changed files with 33 additions and 3 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2006-11-07 Paul Eggert <eggert@cs.ucla.edu>
* lib/autoconf/types.m4 (AC_TYPE_LONG_LONG_INT): Detect bug in
Tandem NonStop Kernel (OSS) cc -O circa 2004, reported by
Matthew Woehlke.
2006-10-28 Ralf Wildenhues <Ralf.Wildenhues@gmx.de>
* tests/torture.at (Configuring subdirectories): Do not skip

30
lib/autoconf/types.m4
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@ -480,10 +480,34 @@ AC_DEFUN([AC_TYPE_LONG_LONG_INT],
int i = 63;]],
[[long long int llmax = 9223372036854775807ll;
return ((ll << 63) | (ll >> 63) | (ll < i) | (ll > i)
| llmax / ll | llmax % ll);]])],
[ac_cv_type_long_long_int=yes],
| (llmax / ll) | (llmax % ll));]])],
[dnl This catches a bug in Tandem NonStop Kernel (OSS) cc -O circa 2004.
dnl If cross compiling, assume the bug isn't important, since
dnl nobody cross compiles for this platform as far as we know.
AC_RUN_IFELSE(
[AC_LANG_PROGRAM(
[[@%:@include <limits.h>
@%:@ifndef LLONG_MAX
@%:@ define HALF \
(1LL << (sizeof (long long int) * CHAR_BIT - 2))
@%:@ define LLONG_MAX (HALF - 1 + HALF)
@%:@endif]],
[[long long int n = 1;
int i;
for (i = 0; ; i++)
{
long long int m = n << i;
if (m >> i != n)
return 1;
if (LLONG_MAX / 2 < m)
break;
}
return 0;]])],
[ac_cv_type_long_long_int=yes],
[ac_cv_type_long_long_int=no],
[ac_cv_type_long_long_int=cross-compiling])],
[ac_cv_type_long_long_int=no])])
if test $ac_cv_type_long_long_int = yes; then
if test $ac_cv_type_long_long_int != no; then
AC_DEFINE([HAVE_LONG_LONG_INT], 1,
[Define to 1 if the system has the type `long long int'.])
fi