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use configure-defined macro instead of __GNUC__
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64852 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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@ -1770,7 +1770,7 @@ VALUE rb_check_symbol(volatile VALUE *namep);
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do RUBY_CONST_ID_CACHE((var) =, (str)) while (0)
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#define CONST_ID_CACHE(result, str) RUBY_CONST_ID_CACHE(result, str)
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#define CONST_ID(var, str) RUBY_CONST_ID(var, str)
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#ifdef __GNUC__
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#ifdef HAVE_BUILTIN___BUILTIN_CONSTANT_P
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/* __builtin_constant_p and statement expression is available
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* since gcc-2.7.2.3 at least. */
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#define rb_intern(str) \
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