1c02928295
<https://gcc.gnu.org/ml/libstdc++/2016-08/msg00006.html> arranged for libstdc++ tests to use -fno-show-column by default, but only for build-tree testing. This patch adds it to the options used for installed testing as well. Tested with installed testing for a cross to x86_64-linux-gnu, where it fixes various test failures. * testsuite/lib/libstdc++.exp (libstdc++_init): Use -fno-show-column in default cxxflags. From-SVN: r264784
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