c-common.h (enum cxx_dialect): Add cxx_unset.
gcc/c-family/ * c-common.h (enum cxx_dialect): Add cxx_unset. * c-common.c (cxx_dialect): Initialize to cxx_unset. * c-opts.c (c_common_post_options): Set C++ dialect to C++98 if unset. gcc/testsuite/ * lib/target-supports.exp (cxx_default): New global. (check_effective_target_c++11_only) (check_effective_target_c++14_only) (check_effective_target_c++98_only) (check_effective_target_c++1z_only): Check it. From-SVN: r222977
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