gnu: classpath: Add aarch64-linux support.

* gnu/packages/java.scm (classpath-bootstrap, classpath-0.99)[source]:
Add patch.
* gnu/packages/patches/classpath-aarch64-support.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu/local.mk

@@ -594,6 +594,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/clang-3.8-libc-search-path.patch		\
   %D%/packages/patches/clang-runtime-asan-build-fixes.patch	\
   %D%/packages/patches/clang-runtime-esan-build-fixes.patch	\
+  %D%/packages/patches/classpath-aarch64-support.patch		\
   %D%/packages/patches/clementine-remove-crypto++-dependency.patch	\
   %D%/packages/patches/clementine-use-openssl.patch		\
   %D%/packages/patches/clisp-glibc-2.26.patch			\

gnu/packages/java.scm

@@ -129,7 +129,8 @@ and binary format defined in The Java Virtual Machine Specification.")
                                   version ".tar.gz"))
               (sha256
                (base32
-                "0i99wf9xd3hw1sj2sazychb9prx8nadxh2clgvk3zlmb28v0jbfz"))))
+                "0i99wf9xd3hw1sj2sazychb9prx8nadxh2clgvk3zlmb28v0jbfz"))
+              (patches (search-patches "classpath-aarch64-support.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:configure-flags
@@ -424,7 +425,8 @@ the standard javac executable.")))
                                   version ".tar.gz"))
               (sha256
                (base32
-                "1j7cby4k66f1nvckm48xcmh352b1d1b33qk7l6hi7dp9i9zjjagr"))))
+                "1j7cby4k66f1nvckm48xcmh352b1d1b33qk7l6hi7dp9i9zjjagr"))
+              (patches (search-patches "classpath-aarch64-support.patch"))))
     (arguments
      `(#:configure-flags
        (list (string-append "--with-ecj-jar="

gnu/packages/patches/classpath-aarch64-support.patch

@@ -0,0 +1,29 @@
+This is modeled after the ia64 support. Aarch64 can be either big endian
+or little endian, so we add the case for both.
+
+---
+ native/fdlibm/ieeefp.h | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/native/fdlibm/ieeefp.h b/native/fdlibm/ieeefp.h
+index 1a9740f..73455c0 100644
+--- a/native/fdlibm/ieeefp.h
++++ b/native/fdlibm/ieeefp.h
+@@ -27,6 +27,14 @@
+ #endif
+ #endif
+ 
++#ifdef __aarch64__
++#ifdef __BIG_ENDIAN__
++#define __IEEE_BIG_ENDIAN
++#else
++#define __IEEE_LITTLE_ENDIAN
++#endif
++#endif
++
+ #ifdef __hppa__
+ #define __IEEE_BIG_ENDIAN
+ #endif
+-- 
+2.16.3
+