buildd log scanner tag W-implicit-declaration

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The build log contains the term
warning: implicit declaration of function ...

Implicit declaration means a function is used without being declared, which means C knows nothing about the number of arguments, types of arguments or type of the return value.

This is dangerous as it might hide issues the compiler could otherwise warn about or cause bad code. If this is found together with other warnings indicating especially bad things happening, the tag E-pointer-trouble-at-implicit is generated instead.

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