2018-01-20 02:14:59 -05:00
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# -*- Autoconf -*-
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2018-01-20 02:05:25 -05:00
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AC_DEFUN([RUBY_STACK_GROW_DIRECTION], [
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AS_VAR_PUSHDEF([stack_grow_dir], [rb_cv_stack_grow_dir_$1])
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AC_CACHE_CHECK(stack growing direction on $1, stack_grow_dir, [
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AS_CASE(["$1"],
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2019-06-19 05:06:57 -04:00
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[m68*|x86*|x64|i?86|ppc*|sparc*|alpha*], [ $2=-1],
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2018-01-20 02:05:25 -05:00
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[hppa*], [ $2=+1],
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[
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2020-12-12 08:55:09 -05:00
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AC_RUN_IFELSE([AC_LANG_SOURCE([[
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2018-01-20 02:05:25 -05:00
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/* recurse to get rid of inlining */
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static int
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stack_growup_p(addr, n)
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volatile int *addr, n;
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{
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volatile int end;
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if (n > 0)
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return *addr = stack_growup_p(addr, n - 1);
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else
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return (&end > addr);
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}
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int main()
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{
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int x;
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return stack_growup_p(&x, 10);
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}
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2020-12-12 08:55:09 -05:00
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]])],[$2=-1],[$2=+1],[$2=0])
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2018-01-20 02:05:25 -05:00
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])
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eval stack_grow_dir=\$$2])
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eval $2=\$stack_grow_dir
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AS_VAR_POPDEF([stack_grow_dir])])dnl
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