Sebastian Sumpf d424134073 cxx: Simplify C++ exception wrapper functions
The wrapper functions (e.g., 'Unwind_*' and friends) now have the same signature
as the original function in 'libgcc', reside in a separate C file which is
archived to cxx.lib.a. In supc++.o we prefix the wrapped functions with '_cxx_'.

This also enables support for riscv.

related to #1880
2016-02-16 14:38:02 +01:00
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