From 9daa9346e2bfca4aa8ef6c459cf9ad8ccf81a8c9 Mon Sep 17 00:00:00 2001
From: Lubomir Rintel <lkundrak@v3.sk>
Date: Fri, 16 Feb 2018 16:05:31 +0100
Subject: [PATCH] build: disable -Wgnu-variable-sized-type-not-at-end for
 systemd code

clang 5.0.1 complains:

  src/systemd/src/libsystemd-network/dhcp6-option.c:40:28: error:
      field 'option' with variable sized type 'struct DHCP6Option' not at
      the end of a struct or class is a GNU extension
      [-Werror,-Wgnu-variable-sized-type-not-at-end]
        struct DHCP6Option option;
                           ^

systemd disables this warning too.
---
 Makefile.am  | 1 +
 configure.ac | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index 7688695eec..c19acb2730 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1225,6 +1225,7 @@ src_libsystemd_nm_la_cppflags = \
 	-I$(srcdir)/src/systemd/src/shared \
 	-I$(srcdir)/src/systemd/src/libsystemd-network \
 	-DNETWORKMANAGER_COMPILATION=NM_NETWORKMANAGER_COMPILATION_SYSTEMD \
+	$(LIBSYSTEMD_NM_CFLAGS) \
 	$(GLIB_CFLAGS) \
 	$(CODE_COVERAGE_CFLAGS)
 
diff --git a/configure.ac b/configure.ac
index 3fd4090a7e..7c6e62007e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1097,6 +1097,9 @@ fi
 
 NM_COMPILER_WARNINGS(CFLAGS, ${more_warnings_default})
 
+NM_COMPILER_FLAG(LIBSYSTEMD_NM_CFLAGS, "-Wno-gnu-variable-sized-type-not-at-end")
+AC_SUBST(LIBSYSTEMD_NM_CFLAGS)
+
 CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
 	-fno-strict-aliasing \
 ])