gnu: libvirt: Don't use bogus cgroup.

Should fix <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36634>.

* gnu/packages/virtualization.scm (libvirt)[source]: Add patch.
* gnu/packages/patches/libvirt-remove-ATTRIBUTE_UNUSED.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.

2 files changed, 43 insertions, 7 deletions

diff --git a/gnu/packages/patches/libvirt-remove-ATTRIBUTE_UNUSED.patch b/gnu/packages/patches/libvirt-remove-ATTRIBUTE_UNUSED.patch
new file mode 100644
index 0000000000..5bfefa70bb
--- /dev/null
+++ b/gnu/packages/patches/libvirt-remove-ATTRIBUTE_UNUSED.patch
@@ -0,0 +1,34 @@
+From: Tobias Geerinckx-Rice <me@tobias.gr>
+Date: Thu, 25 Jul 2019 21:48:25 +0200
+Subject: [PATCH]: libvirt: remove ATTRIBUTE_UNUSED
+
+This should fix the error reported here[0].  Patch taken verbatim from
+upstream[1].
+
+[0]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36634#28
+[1]: https://github.com/libvirt/libvirt/commit/759bf903a6c24a8efa25c7cf4b099d952eda9bd3
+
+From 759bf903a6c24a8efa25c7cf4b099d952eda9bd3 Mon Sep 17 00:00:00 2001
+From: Pavel Hrdina <phrdina@redhat.com>
+Date: Mon, 22 Jul 2019 14:46:34 +0200
+Subject: [PATCH] vircgroupv2: remove ATTRIBUTE_UNUSED for used attribute
+
+Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
+Acked-by: Peter Krempa <pkrempa@redhat.com>
+---
+ src/util/vircgroupv2.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
+index af3192c99c..e36c36685b 100644
+--- a/src/util/vircgroupv2.c
++++ b/src/util/vircgroupv2.c
+@@ -399,7 +399,7 @@ virCgroupV2EnableController(virCgroupPtr group,
+ 
+ 
+ static int
+-virCgroupV2MakeGroup(virCgroupPtr parent ATTRIBUTE_UNUSED,
++virCgroupV2MakeGroup(virCgroupPtr parent,
+                      virCgroupPtr group,
+                      bool create,
+                      unsigned int flags)
diff --git a/gnu/packages/virtualization.scm b/gnu/packages/virtualization.scm
index c6371a6ac1..7c69f7b60e 100644
--- a/gnu/packages/virtualization.scm
+++ b/gnu/packages/virtualization.scm
@@ -391,13 +391,15 @@ manage system or application containers.")
   (package
     (name "libvirt")
     (version "5.5.0")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append "https://libvirt.org/sources/libvirt-"
-                                  version ".tar.xz"))
-              (sha256
-               (base32
-                "1s1mzw4cmkcfivs1kphpgy4lpddx0w1qnjysr4ggk5558w4yy1i3"))))
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://libvirt.org/sources/libvirt-"
+                           version ".tar.xz"))
+       (sha256
+        (base32 "1s1mzw4cmkcfivs1kphpgy4lpddx0w1qnjysr4ggk5558w4yy1i3"))
+       (patches
+        (search-patches "libvirt-remove-ATTRIBUTE_UNUSED.patch"))))
     (build-system gnu-build-system)
     (arguments
      `(#:configure-flags