passt: Fix build with gcc 7, use std=c99, enable some more Clang checkers

Unions and structs, you all have names now.

Take the chance to enable bugprone-reserved-identifier,
cert-dcl37-c, and cert-dcl51-cpp checkers in clang-tidy.

Provide a ffsl() weak declaration using gcc built-in.

Start reordering includes, but that's not enough for the
llvm-include-order checker yet.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/icmp.h b/icmp.h
index 3ccc598..89b5f55 100644
--- a/icmp.h
+++ b/icmp.h
@@ -26,7 +26,7 @@ union icmp_epoll_ref {
 	struct {
 		uint32_t	v6:1,
 				id:16;
-	};
+	} icmp;
 	uint32_t u32;
 };