lxc: temporary workaround for gcc 7 issue

gcc 7 has a bug:
https://bugzilla.yoctoproject.org/show_bug.cgi?id=11672
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78969

In order to avoid the build failure that this causes we reduce the
range by one. Better to have a slight reduction in the range than
having nobody to be able to build and use lxc.

Once gcc is fixed this can be reverted.

Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

2 files changed, 35 insertions, 0 deletions

diff --git a/recipes-containers/lxc/files/cgroups-work-around-issue-in-gcc-7.patch b/recipes-containers/lxc/files/cgroups-work-around-issue-in-gcc-7.patch
new file mode 100644
index 00000000..90740fb3
--- /dev/null
+++ b/recipes-containers/lxc/files/cgroups-work-around-issue-in-gcc-7.patch
@@ -0,0 +1,34 @@
+From 58a2d817a82100d287c60c63315d81445cdba3f9 Mon Sep 17 00:00:00 2001
+From: Mark Asselstine <mark.asselstine@windriver.com>
+Date: Thu, 15 Jun 2017 15:12:08 -0400
+Subject: [PATCH] cgroups: work around issue in gcc 7
+
+This works around
+https://bugzilla.yoctoproject.org/show_bug.cgi?id=11672
+https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78969
+
+By removing a single cgroup entry. For the majority of usecases this
+loss of a single entry should not be an issue and once gcc 7 is fixed
+we can revert this.
+
+Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
+---
+ src/lxc/cgroups/cgfsng.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/lxc/cgroups/cgfsng.c b/src/lxc/cgroups/cgfsng.c
+index ebd548b..c520abd 100644
+--- a/src/lxc/cgroups/cgfsng.c
++++ b/src/lxc/cgroups/cgfsng.c
+@@ -1373,7 +1373,7 @@ static inline bool cgfsng_create(void *hdata)
+        offset = cgname + len - 5;
+ 
+ again:
+-       if (idx == 1000) {
++       if (idx == 999) {
+                ERROR("Too many conflicting cgroup names");
+                goto out_free;
+        }
+-- 
+2.7.4
+
diff --git a/recipes-containers/lxc/lxc_2.0.8.bb b/recipes-containers/lxc/lxc_2.0.8.bb
index 80c8da73..3dd9f63f 100644
--- a/recipes-containers/lxc/lxc_2.0.8.bb
+++ b/recipes-containers/lxc/lxc_2.0.8.bb
@@ -28,6 +28,7 @@ SRC_URI = "http://linuxcontainers.org/downloads/${BPN}-${PV}.tar.gz \
         file://lxc-fix-B-S.patch \
         file://lxc-doc-upgrade-to-use-docbook-3.1-DTD.patch \
         file://logs-optionally-use-base-filenames-to-report-src-fil.patch \
+        file://cgroups-work-around-issue-in-gcc-7.patch \
         "
 
 SRC_URI[md5sum] = "7bfd95280522d7936c0979dfea92cdb5"