From: Damjan Marion <damarion@cisco.com>
Date: Tue, 24 Apr 2018 22:56:08 +0000 (+0200)
Subject: Fix sample-plugin build with newer clang versions
X-Git-Tag: v18.07-rc1~425
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=de02414c3d74efd71cbc1594b19e07027191a3d0;p=vpp.git

Fix sample-plugin build with newer clang versions

Change-Id: Id90e6fb1211b7789e6e3df0b6579c4757e7fdfa6
Signed-off-by: Damjan Marion <damarion@cisco.com>
---

diff --git a/src/examples/sample-plugin/configure.ac b/src/examples/sample-plugin/configure.ac
index 204da2fe1de..588e7dd16b9 100644
--- a/src/examples/sample-plugin/configure.ac
+++ b/src/examples/sample-plugin/configure.ac
@@ -6,6 +6,26 @@ AC_PREFIX_DEFAULT([/usr])
 
 AC_PROG_CC
 
+# Check if compiler supports specific flag
+AC_DEFUN([CC_CHECK_FLAG],
+[
+  AC_MSG_CHECKING([if $CC supports $1])
+  AC_LANG_PUSH([C])
+  ac_saved_cflags="$CFLAGS"
+  CFLAGS="-Werror $1"
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
+  [cc_flag_check=yes],
+  [cc_flag_check=no]
+)
+  AC_MSG_RESULT([$cc_flag_check])
+  CFLAGS="$ac_saved_cflags"
+  AC_LANG_POP([C])
+])
+
+CC_CHECK_FLAG("-Wno-address-of-packed-member")
+AS_IF([test "$cc_flag_check" = yes],
+	[CFLAGS="${CFLAGS} -Wno-address-of-packed-member"], [])
+
 AC_OUTPUT([Makefile])
 
 AC_CONFIG_MACRO_DIR([m4])