d2c737c40c
The <syncstream> header is only supported for the cxx11 ABI. The declarations of basic_syncbuf, basic_osyncstream, syncbuf and osyncstream were already correctly guarded by a check for _GLIBCXX_USE_CXX11_ABI, but the wsyncbuf and wosyncstream declarations were not. libstdc++-v3/ChangeLog: * testsuite/27_io/headers/iosfwd/synopsis.cc: Make wsyncbuf and wosyncstream depend on _GLIBCXX_USE_CXX11_ABI. (cherry picked from commit f9f05e483984bf89fec7778aaa55ece8ba2a86bb)
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