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Chun-wei Fan authored
There are now C99 functions that the printf items want to use that may not be necessarily supported by the math.h that is shipped by the compiler, such as signbit(), isinf(), isnan() and isfinite() and their double, long and float counterparts. This checks for whether these functions are provided by the math.h shipped by the compiler, and builds the gnulib implementations of them if they cannot be found. Currently no attempt is made to check whether these, if available from the compiler's math.h, are compliant with the specs.
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