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I'm not sure what the policy actaully is here, but some newlib functions
now have an extra underscore before them. This defines a bunch of
aliases and some more wrappers to link against the correct newlib
functions for 2.5.0 but maintain compatibility with 2.4.0.
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The e31's init.c calls puts intsead of printf, which oddly enough is a
lot bigger: since we wrap printf, puts pulls in a lot of newlib. This
adds a wrapped puts so it's very small.
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The --wrap feature of GNU ld supports a cleaner framework for linking in
alternative implementations of libc functions without cpp hacks.
Place wrappers in separate object files to reduce static code size.
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