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coroutines.exp was basically only there to add -std=c++20 to all the tests; removing it lets us use the general support for running tests under multiple standards. Doing this revealed that some tests that specifically run in C++17 mode were relying on -std=c++20 followed by -std=c++17 leaving flag_coroutines set, which seems unintentional, and different from how we handle other feature flags. So this changes that, and adds the missing -fcoroutines to those tests. gcc/testsuite/ChangeLog: * g++.dg/coroutines/co-await-syntax-09-convert.C: Add -fcoroutines. * g++.dg/coroutines/co-await-syntax-10.C * g++.dg/coroutines/co-await-syntax-11.C * g++.dg/coroutines/co-await-void_type.C * g++.dg/coroutines/co-return-warning-1.C * g++.dg/coroutines/ramp-return-a.C * g++.dg/coroutines/ramp-return-c.C: Likewise. * g++.dg/coroutines/coroutines.exp: Removed. * lib/g++-dg.exp: Start at C++20 for coroutines/ gcc/c-family/ChangeLog: * c-opts.cc (c_common_post_options): Set flag_coroutines. (set_std_cxx20, set_std_cxx23, set_std_cxx26): Not here.
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