diff options
Diffstat (limited to 'lib/autoconf/functions.m4')
| -rw-r--r-- | lib/autoconf/functions.m4 | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/lib/autoconf/functions.m4 b/lib/autoconf/functions.m4 index 31568872..cbc34135 100644 --- a/lib/autoconf/functions.m4 +++ b/lib/autoconf/functions.m4 @@ -325,17 +325,20 @@ AC_CACHE_CHECK([stack direction for C alloca], [AC_RUN_IFELSE([AC_LANG_SOURCE( [AC_INCLUDES_DEFAULT int -find_stack_direction (char *addr) +find_stack_direction (int *addr, int depth) { - char dummy; - return (! addr ? find_stack_direction (&dummy) - : addr < &dummy ? 1 : -1); + int dir, dummy = 0; + if (! addr) + addr = &dummy; + *addr = addr < &dummy ? 1 : addr == &dummy ? 0 : -1; + dir = depth ? find_stack_direction (addr, depth - 1) : 0; + return dir + dummy; } int -main (void) +main (int argc, char **argv) { - return find_stack_direction (0) < 0; + return find_stack_direction (0, argc + !argv + 20) < 0; }])], [ac_cv_c_stack_direction=1], [ac_cv_c_stack_direction=-1], |