travis: Disable warning that causes a false positive in Xcode 8.3+

Xcode 8.3, to which there recently was a switch, spits out a warning for
the potentially unaligned access to ip6_plen in ip-packet.c, which we
explicitly read via untoh16() hence the access to that pointer is not
actually unaligned.  It seems the compiler is not able to determine that
there is no unaligned access even though the function is defined in the
header and marked inline.

diff --git a/scripts/test.sh b/scripts/test.sh
index f89b28f8cd6de1e897ddf99b2ef52cb0a8ae6547..d8a4ec52996ba73c0aaba013572b5887a778b579 100755 (executable)
--- a/scripts/test.sh
+++ b/scripts/test.sh
@@ -96,6 +96,8 @@ win*)
        esac
        ;;
 osx)
+       # this causes a false positive in ip-packet.c since Xcode 8.3
+       CFLAGS="$CFLAGS -Wno-address-of-packed-member"
        # use the same options as in the Homebrew Formula
        CONFIG="--disable-defaults --enable-charon --enable-cmd --enable-constraints
                        --enable-curl --enable-eap-gtc --enable-eap-identity