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#define weak_alias(name, aliasname) \
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extern __typeof (name) aliasname __attribute__ ((__weak__, __alias__ (#name)));
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#if 0
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#define weak_extern(symbol) _weak_extern (symbol)
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#define _weak_extern(symbol) asm (".weak " #symbol);
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#endif
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#define weak_function __attribute__ ((__weak__))
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