Fix sample-plugin build with newer clang versions

[vpp.git] / src / examples / sample-plugin / configure.ac

diff --git a/src/examples/sample-plugin/configure.ac b/src/examples/sample-plugin/configure.ac
index 204da2f..588e7dd 100644 (file)
--- 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])