Don't wrongly detect libstdc++ 6.4 as >= 7
6.4 has been release after 20170502 but still throws ios_base::failure with old ABI. It is not a good idea to use the timestamp to distinguish release versions. Note that _GLIBCXX_RELEASE is not defined in older GCC versions. But if the macro is not present, we also know that it will throw the old version.
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@ -4,7 +4,7 @@
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#include <cstddef>
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// ensure the old ABI is used under libstd++ < 7 and the new ABI under libstd++ >= 7
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#if __GLIBCXX__ >= 20170502
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#if defined(_GLIBCXX_RELEASE) && _GLIBCXX_RELEASE >= 7
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#undef _GLIBCXX_USE_CXX11_ABI
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#define _GLIBCXX_USE_CXX11_ABI 1
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#endif
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