gnu: Add julia-quadmath.

* gnu/packages/julia-xyz.scm (julia-quadmath-0.5.2): New variable.

gnu/packages/julia-xyz.scm

@@ -1933,3 +1933,25 @@ Hankel, Airy, error, Dawson, sine and cosine integrals, eta, zeta, digamma,
 inverse digamma, trigamma, and polygamma functions. Most of these functions
 were formerly part of Base in early versions of Julia.")
     (license license:expat)))
+
+(define-public julia-quadmath
+  (package
+    (name "julia-quadmath")
+    (version "0.5.2")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/JuliaMath/Quadmath.jl")
+             (commit (string-append "v" version))))
+       (file-name "Quadmath")
+       (sha256
+        (base32 "0gq0zxkqwv9z8w0635zcp86q7q67vgc91b6f4xrr3miq2fiy44q3"))))
+    (propagated-inputs `(("julia-requires" ,julia-requires)
+                         ("julia-specialfunctions" ,julia-specialfunctions)))
+    (build-system julia-build-system)
+    (home-page "https://github.com/JuliaMath/Quadmath.jl")
+    (synopsis "Float128 and libquadmath for the Julia language")
+    (description "This is a Julia interface to libquadmath, providing a
+Float128 type corresponding to the IEEE754 binary128 floating point format.")
+    (license license:expat)))