Now
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Remove "--disable-libstdcxx-dual-abi". This option does not do what
it says: Instead of disabling the dual-abi and letting you choose
which one you want, it disables the cxx11 abi and the
"--with-default-libstdcxx-abi=OPTION" becomes a noop. Removing the
old COW compatibility ABI is not easy. For more info see:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/configure.html
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html
it says: Instead of disabling the dual-abi and letting you choose
which one you want, it disables the cxx11 abi and the
"--with-default-libstdcxx-abi=OPTION" becomes a noop. Removing the
old COW compatibility ABI is not easy. For more info see:
https://gcc.gnu.org/onlinedocs/libstdc++/manual/configure.html
https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html