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=== Description (from pull-request) ===
Both are standard in LXC for a long time now. And gcc-4.8 which is the
minimal compiler version we require (same as the Linux kernel) deals
with this.

Closes #3287.
Signed-off-by: Christian Brauner <christian.brau...@ubuntu.com>
From 28572e1057df67d08073d8dfdde8f18d526b7344 Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brau...@ubuntu.com>
Date: Wed, 11 Mar 2020 03:10:09 +0100
Subject: [PATCH] configure: add -Wvla and -std=gnu11

Both are standard in LXC for a long time now. And gcc-4.8 which is the
minimal compiler version we require (same as the Linux kernel) deals
with this.

Closes #3287.
Signed-off-by: Christian Brauner <christian.brau...@ubuntu.com>
---
 configure.ac       | 2 +-
 src/proc_cpuview.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 21ae513..4092883 100644
--- a/configure.ac
+++ b/configure.ac
@@ -248,8 +248,8 @@ AX_CHECK_COMPILE_FLAG([-Wnested-externs], [CFLAGS="$CFLAGS 
-Wnested-externs"],,[
 AX_CHECK_COMPILE_FLAG([-fasynchronous-unwind-tables], [CFLAGS="$CFLAGS 
-fasynchronous-unwind-tables"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-pipe], [CFLAGS="$CFLAGS -pipe"],,[-Werror])
 AX_CHECK_COMPILE_FLAG([-fexceptions], [CFLAGS="$CFLAGS 
-fexceptions"],,[-Werror])
-CFLAGS="$CFLAGS -fvisibility=hidden"
 
+CFLAGS="$CFLAGS -fvisibility=hidden -Wvla -std=gnu11"
 AX_CHECK_LINK_FLAG([-z relro], [LDFLAGS="$LDFLAGS -z relro"],,[])
 AX_CHECK_LINK_FLAG([-z now], [LDFLAGS="$LDFLAGS -z now"],,[])
 
diff --git a/src/proc_cpuview.c b/src/proc_cpuview.c
index 4d8ead5..15a7b5c 100644
--- a/src/proc_cpuview.c
+++ b/src/proc_cpuview.c
@@ -433,7 +433,7 @@ static bool read_cpu_cfs_param(const char *cg, const char 
*param, int64_t *value
        if (!cgroup_ops->get(cgroup_ops, "cpu", cg, file, &str))
                return false;
 
-       if (sscanf(str, first ? "%"PRId64 : "%*"PRId64" %"PRId64, value) != 1)
+       if (sscanf(str, first ? "%" PRId64 : "%*" PRId64 " %" PRId64, value) != 
1)
                return false;
 
        return true;
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