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dnl -*- Autoconf -*-
AC_DEFUN([RUBY_CHECK_BUILTIN_SETJMP], [
AS_IF([test x"${ac_cv_func___builtin_setjmp}" = xyes], [
unset ac_cv_func___builtin_setjmp
])
AC_CACHE_CHECK(for __builtin_setjmp, ac_cv_func___builtin_setjmp,
[
ac_cv_func___builtin_setjmp=no
for cast in "" "(void **)"; do
RUBY_WERROR_FLAG(
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <setjmp.h>
@%:@include <stdio.h>
jmp_buf jb;
@%:@ifdef NORETURN
NORETURN(void t(void));
@%:@endif
void t(void) {__builtin_longjmp($cast jb, 1);}
int jump(void) {(void)(__builtin_setjmp($cast jb) ? 1 : 0); return 0;}]],
[[
void (*volatile f)(void) = t;
if (!jump()) printf("%d\n", f != 0);
]])],
[ac_cv_func___builtin_setjmp="yes with cast ($cast)"])
])
test "$ac_cv_func___builtin_setjmp" = no || break
done])
])dnl
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