cpp module restricts product.version to x.y.z

        if (!Gcc.isNumericProductVersion(product.version)) {
            // Dynamic library version numbers like "A" or "B" are common on Apple platforms, so
            // don't restrict the product version to a componentized version number here.
            if (cpp.imageFormat === "macho")
                return product.version;

            throw("product.version must be a string in the format x[.y[.z[.w]] "
                  + "where each component is an integer");
        }