2021-04-17 06:14:21 -04:00
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dnl -*- Autoconf -*-
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2018-01-20 02:05:25 -05:00
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AC_DEFUN([RUBY_CHECK_BUILTIN_SETJMP], [
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AS_IF([test x"${ac_cv_func___builtin_setjmp}" = xyes], [
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unset ac_cv_func___builtin_setjmp
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])
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AC_CACHE_CHECK(for __builtin_setjmp, ac_cv_func___builtin_setjmp,
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[
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ac_cv_func___builtin_setjmp=no
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for cast in "" "(void **)"; do
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RUBY_WERROR_FLAG(
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2020-12-12 08:55:09 -05:00
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <setjmp.h>
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2018-01-20 02:05:25 -05:00
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@%:@include <stdio.h>
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jmp_buf jb;
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@%:@ifdef NORETURN
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NORETURN(void t(void));
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@%:@endif
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void t(void) {__builtin_longjmp($cast jb, 1);}
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2020-12-12 08:55:09 -05:00
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int jump(void) {(void)(__builtin_setjmp($cast jb) ? 1 : 0); return 0;}]],
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[[
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2018-01-20 02:05:25 -05:00
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void (*volatile f)(void) = t;
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if (!jump()) printf("%d\n", f != 0);
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2020-12-12 08:55:09 -05:00
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]])],
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2018-01-20 02:05:25 -05:00
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[ac_cv_func___builtin_setjmp="yes with cast ($cast)"])
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])
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test "$ac_cv_func___builtin_setjmp" = no || break
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done])
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])dnl
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