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This simplifies the v3-minimum-std procedure slightly, but the main advantage is making v3_modules_std depend on v3_max_std so that we don't have to update two separate variables when new effective targets such as c++29 get added. libstdc++-v3/ChangeLog: * testsuite/lib/libstdc++.exp (v3_default_std, v3_max_std): New global variables. (v3-minimum-std): Use globals instead of arguments. (v3_modules_std): Define in terms of $v3_max_std. (v3-dg-runtest): Use globals instead of local variables. Adjust call to v3-min-std. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
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