Stephanos Ioannidis 7144b5f275 newlib: Add libstdc++ nano-specific CXXFLAGS
This commit adds a new config that can be used to specify the target
CXXFLAGS specific to the libstdc++ newlib-nano variant.

By default, this config is set to specify the `-fno-exceptions` option,
which disables C++ exception handling support and greatly reduces the
compiled binary size.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
2021-06-07 19:53:28 +09:00
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