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As explained in the PR, flockfile and funlockfile are always declared by newlib and there's no easy way to detect whether they're actually defined. Ensure that ac_stdio_locking=no gets set for non-cygwin newlib targets. libstdc++-v3/ChangeLog: PR libstdc++/123406 * acinclude.m4 (GLIBCXX_CHECK_STDIO_LOCKING): Override detection of flockfile for non-cygwin newlib targets. * configure: Regenerate. Reviewed-by: Tomasz Kamiński <tkaminsk@redhat.com>
file: libstdc++-v3/README New users may wish to point their web browsers to the file index.html in the 'doc/html' subdirectory. It contains brief building instructions and notes on how to configure the library in interesting ways.