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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 1ea6eb143a
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) #if defined(__HP_cc) || defined (__HP_aCC) || defined (__hpux)
#pragma noinline #pragma noinline
#endif #endif
int find_stack_direction () /* Check stack direction (-1 down, 1 up) */
{ int f(int *a)
static char *addr = 0; {
auto char dummy; int b;
if (addr == 0) return(&b > a)?1:-1;
{ }
addr = &dummy; /*
return find_stack_direction (); Prevent compiler optimizations by calling function
} through pointer.
else */
return (&dummy > addr) ? 1 : -1; volatile int (*ptr_f)(int *) = f;
} int main()
int main () {
{ int a;
exit (find_stack_direction() < 0); exit(ptr_f(&a) < 0);
}], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1, }
], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1,
ac_cv_c_stack_direction=)]) ac_cv_c_stack_direction=)])
AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction) AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)
])dnl ])dnl