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, 2 deletions

diff --git a/util.h b/util.h
index 1fc2983..0d50868 100644
--- a/util.h
+++ b/util.h
@@ -136,9 +136,7 @@ enum {
 #define SNDBUF_BIG		(4 * 1024 * 1024)
 #define SNDBUF_SMALL		(128 * 1024)
 
-#include <linux/ipv6.h>
 #include <net/if.h>
-#include <linux/ip.h>
 #include <limits.h>
 #include <stdarg.h>
 
@@ -151,6 +149,7 @@ enum bind_type {
 
 struct ctx;
 
+__attribute__ ((weak)) int ffsl(long int i) { return __builtin_ffsl(i); }
 void __openlog(const char *ident, int option, int facility);
 void passt_vsyslog(int pri, const char *format, va_list ap);
 void __setlogmask(int mask);