2018-01-20 10:14:59 +03:00
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# -*- Autoconf -*-
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2018-01-20 10:05:25 +03:00
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AC_DEFUN([RUBY_CHECK_BUILTIN_SETJMP], [
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AS_IF([test x"${ac_cv_func___builtin_setjmp}" = xyes], [
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unset ac_cv_func___builtin_setjmp
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])
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AC_CACHE_CHECK(for __builtin_setjmp, ac_cv_func___builtin_setjmp,
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[
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ac_cv_func___builtin_setjmp=no
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for cast in "" "(void **)"; do
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RUBY_WERROR_FLAG(
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[AC_TRY_LINK([@%:@include <setjmp.h>
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@%:@include <stdio.h>
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jmp_buf jb;
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@%:@ifdef NORETURN
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NORETURN(void t(void));
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@%:@endif
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void t(void) {__builtin_longjmp($cast jb, 1);}
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int jump(void) {(void)(__builtin_setjmp($cast jb) ? 1 : 0); return 0;}],
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[
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void (*volatile f)(void) = t;
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if (!jump()) printf("%d\n", f != 0);
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],
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[ac_cv_func___builtin_setjmp="yes with cast ($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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