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merge from 5.1 repo.

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This commit is contained in:
Andrei Elkin 2013-03-26 23:10:42 +02:00
commit cf23bb763b
1 changed files with 17 additions and 16 deletions
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33
config/ac-macros/misc.m4
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@ -460,22 +460,23 @@ AC_DEFUN([MYSQL_STACK_DIRECTION],
#if defined(__HP_cc) || defined (__HP_aCC) || defined (__hpux)
#pragma noinline
#endif
int find_stack_direction ()
{
static char *addr = 0;
auto char dummy;
if (addr == 0)
{
addr = &dummy;
return find_stack_direction ();
}
else
return (&dummy > addr) ? 1 : -1;
}
int main ()
{
exit (find_stack_direction() < 0);
}], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1,
/* Check stack direction (-1 down, 1 up) */
int f(int *a)
{
int b;
return(&b > a)?1:-1;
}
/*
Prevent compiler optimizations by calling function
through pointer.
*/
volatile int (*ptr_f)(int *) = f;
int main()
{
int a;
exit(ptr_f(&a) < 0);
}
], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1,
ac_cv_c_stack_direction=)])
AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
])dnl