Rosen Penev 9f7d36d1a9 libcxx: Add size optimizations
Changed standard to 2a. 2a (as well as 17) contain more constexpr
functions, which are evaluated at compile time. This saves space.

Added --gc-sections. With the CXXABI change, this now makes the package
smaller.

With these, size went down to 210845 on mipsel_24kc.

Also fixed two small compiler warnings. No real change in behavior.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
2020-01-01 16:59:32 +01:00
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