eval_intern.h: prevent core dump with clang and make test-all
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61041 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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@ -144,7 +144,11 @@ LONG WINAPI rb_w32_stack_overflow_handler(struct _EXCEPTION_POINTERS *);
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#define EC_REPUSH_TAG() (void)(_ec->tag = &_tag)
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#if defined __GNUC__ && __GNUC__ == 4 && (__GNUC_MINOR__ >= 6 && __GNUC_MINOR__ <= 8)
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#if defined __GNUC__ && __GNUC__ == 4 && (__GNUC_MINOR__ >= 6 && __GNUC_MINOR__ <= 8) || __clang__
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/* This macro prevents GCC 4.6--4.8 from emitting maybe-uninitialized warnings.
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* This macro also prevents Clang from dumping core in EC_EXEC_TAG().
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* (I confirmed Clang 4.0.1 and 4.0.0.)
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*/
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# define VAR_FROM_MEMORY(var) __extension__(*(__typeof__(var) volatile *)&(var))
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# define VAR_INITIALIZED(var) ((var) = VAR_FROM_MEMORY(var))
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# define VAR_NOCLOBBERED(var) volatile var
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