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Some build rule fixes (fix use of libstdc++ and printf) #111

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Some build rule fixes (fix use of libstdc++ and printf) #111

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Commits on Sep 29, 2020

  1. Link using g++ 

    This ensures some C++-specific symbols, such as
`std::_throw_bad_function_call` and probably others, are automatically
included in the link, preventing linker errors when using some standard
c++ library bits (such as `std::function`).

This follows the same change done for SAMD:

    arduino/ArduinoCore-samd#276
    @matthijskooijman
    matthijskooijman committed Sep 29, 2020
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  2. Remove override printf define from c receipe 

    This define would serve to use the integer-only version of printf rather
than the default. In commit 46470a9 (Remove override printf define from
cpp receipe), this was removed from the cpp recipe, probably because
this define could cause problems in C++ code and because the Due has
plenty of memory for this.

However, this same override was still present in the c recipe, so this
introduced an inconsistency between .c and .cpp files, where they would
end up getting different versions of printf. This commit fixes this by
also removing the override for .c files.
    @matthijskooijman
    matthijskooijman committed Sep 29, 2020
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