diff options
Diffstat (limited to 'tool/m4/ruby_check_builtin_setjmp.m4')
| -rw-r--r-- | tool/m4/ruby_check_builtin_setjmp.m4 | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tool/m4/ruby_check_builtin_setjmp.m4 b/tool/m4/ruby_check_builtin_setjmp.m4 new file mode 100644 index 0000000000..8f25db8eed --- /dev/null +++ b/tool/m4/ruby_check_builtin_setjmp.m4 @@ -0,0 +1,26 @@ +AC_DEFUN([RUBY_CHECK_BUILTIN_SETJMP], [ +AS_IF([test x"${ac_cv_func___builtin_setjmp}" = xyes], [ + unset ac_cv_func___builtin_setjmp +]) +AC_CACHE_CHECK(for __builtin_setjmp, ac_cv_func___builtin_setjmp, + [ + ac_cv_func___builtin_setjmp=no + for cast in "" "(void **)"; do + RUBY_WERROR_FLAG( + [AC_TRY_LINK([@%:@include <setjmp.h> + @%:@include <stdio.h> + jmp_buf jb; + @%:@ifdef NORETURN + NORETURN(void t(void)); + @%:@endif + void t(void) {__builtin_longjmp($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 |