avr-libstdcpp
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<cmath> not compatible with -mdouble=64
As it seems, this library is not compatible with -mdouble=64, which is enabled in the default conrigurations since v10, see
- https://gcc.gnu.org/gcc-10/changes.html#avr
- https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html#index-mdouble