gnu: linux-libre: Fix build on AArch64.

* gnu/packages/patches/binutils-aarch64-symbol-relocation.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/base.scm (binutils/fixed): New public variable.
* gnu/packages/linux.scm (make-linux-libre)[native-inputs]: On aarch64, define
new ld-wrapper with the above binutils and use it.

gnu/local.mk

@@ -582,6 +582,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/bash-completion-directories.patch	\
   %D%/packages/patches/bazaar-CVE-2017-14176.patch		\
   %D%/packages/patches/bind-CVE-2018-5738.patch			\
+  %D%/packages/patches/binutils-aarch64-symbol-relocation.patch	\
   %D%/packages/patches/binutils-loongson-workaround.patch	\
   %D%/packages/patches/blast+-fix-makefile.patch		\
   %D%/packages/patches/boost-fix-icu-build.patch		\

gnu/packages/base.scm

@@ -480,6 +480,17 @@ (define-public binutils
    (license gpl3+)
    (home-page "https://www.gnu.org/software/binutils/")))
 
+(define-public binutils/fixed
+  ;; TODO: Incorporate this in binutils during the next rebuild cycle.
+  (hidden-package
+   (package
+     (inherit binutils)
+     (source (origin
+               (inherit (package-source binutils))
+               (patches (append (origin-patches (package-source binutils))
+                                (search-patches
+                                 "binutils-aarch64-symbol-relocation.patch"))))))))
+
 (define* (make-ld-wrapper name #:key
                           (target (const #f))
                           binutils

gnu/packages/linux.scm

@@ -295,6 +295,12 @@ (define* (make-linux-libre version hash supported-systems
                  (or (%current-target-system) (%current-system)))
            ((or "x86_64" "i386")
             `(("gcc" ,gcc-7)))
+           ("arm64"
+            ;; Work around a binutils 2.30 bug where some kernel symbols would
+            ;; be incorrectly marked as relocatable:
+            ;; <https://sourceware.org/bugzilla/show_bug.cgi?id=22764>.
+            `(("ld-wrapper" ,(make-ld-wrapper "ld-wrapper"
+                                              #:binutils binutils/fixed))))
            (_
             '()))
        ,@(match (and configuration-file

gnu/packages/patches/binutils-aarch64-symbol-relocation.patch

@@ -0,0 +1,36 @@
+Fix a regression in Binutils 2.30 where some symbols are incorrectly assumed
+to be addresses:
+
+https://sourceware.org/bugzilla/show_bug.cgi?id=22764
+
+Patch taken from upstream (with ChangeLog entries and tests omitted):
+
+https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;h=279b2f94168ee91e02ccd070d27c983fc001fe12
+
+diff --git a/bfd/elfnn-aarch64.c b/bfd/elfnn-aarch64.c
+index af448f9..2737773 100644
+--- a/bfd/elfnn-aarch64.c
++++ b/bfd/elfnn-aarch64.c
+@@ -7189,10 +7189,19 @@ elfNN_aarch64_check_relocs (bfd *abfd, struct bfd_link_info *info,
+ #if ARCH_SIZE == 64
+ 	case BFD_RELOC_AARCH64_32:
+ #endif
+-	  if (bfd_link_pic (info)
+-	      && (sec->flags & SEC_ALLOC) != 0
+-	      && (sec->flags & SEC_READONLY) != 0)
++	  if (bfd_link_pic (info) && (sec->flags & SEC_ALLOC) != 0)
+ 	    {
++	      if (h != NULL
++		  /* This is an absolute symbol.  It represents a value instead
++		     of an address.  */
++		  && ((h->root.type == bfd_link_hash_defined
++		       && bfd_is_abs_section (h->root.u.def.section))
++		      /* This is an undefined symbol.  */
++		      || h->root.type == bfd_link_hash_undefined))
++		break;
++
++	      /* For local symbols, defined global symbols in a non-ABS section,
++		 it is assumed that the value is an address.  */
+ 	      int howto_index = bfd_r_type - BFD_RELOC_AARCH64_RELOC_START;
+ 	      _bfd_error_handler
+ 		/* xgettext:c-format */