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For platforms like Mingw and Cygwin, cygwin refuses to generate the shared library without using -no-undefined. Attached patch makes sure the right flags are used, since libtool is already used to link libstdc++. libstdc++-v3/ChangeLog: * src/Makefile.am (libstdc___la_LINK): Add lt_host_flags. * src/Makefile.in: Regenerate.
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.