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* expr.c (expand_expr_real_1) <case CALL_EXPR>: Use get_callee_fndecl instead of checking CALL_EXPR_FN directly to test for builtins. If error or warning attributes are present, print error resp. warning. * c-common.c (handle_error_attribute): New function. (c_common_attribute_table): Add error and warning attributes. * doc/extend.texi: Document error and warning attributes. * gcc.dg/va-arg-pack-len-1.c: Use error and warning attributes. * gcc.dg/va-arg-pack-len-2.c: New test. * g++.dg/ext/va-arg-pack-len-1.C: Use error and warning attributes. * g++.dg/ext/va-arg-pack-len-2.C: New test. From-SVN: r128687
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