Merge branch 'ticket31687_035' into ticket31687_040

changes/ticket31687_1

@@ -0,0 +1,4 @@
+  o Minor bugfixes (compilation):
+    - Suppress spurious float-conversion warnings from GCC when calling
+      floating-point classifier functions on FreeBSD.  Fixes part of bug
+      31687; bugfix on 0.3.1.5-alpha.

changes/ticket31687_2

@@ -0,0 +1,5 @@
+  o Minor bugfixes (FreeBSD, PF-based proxy, IPv6):
+    - When extracting an IPv6 address from a PF-based proxy, verify
+      that we are actually configured to receive an IPv6 address,
+      and log an internal error if not. Fixes part of bug 31687;
+      bugfix on 0.2.3.4-alpha.

src/core/or/connection_edge.c

@@ -2559,8 +2559,11 @@ destination_from_pf(entry_connection_t *conn, socks_request_t *req)
   } else if (proxy_sa->sa_family == AF_INET6) {
     struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)proxy_sa;
     pnl.af = AF_INET6;
-    memcpy(&pnl.saddr.v6, tor_addr_to_in6(&ENTRY_TO_CONN(conn)->addr),
-           sizeof(struct in6_addr));
+    const struct in6_addr *dest_in6 =
+      tor_addr_to_in6(&ENTRY_TO_CONN(conn)->addr);
+    if (BUG(!dest_in6))
+      return -1;
+    memcpy(&pnl.saddr.v6, dest_in6, sizeof(struct in6_addr));
     pnl.sport = htons(ENTRY_TO_CONN(conn)->port);
     memcpy(&pnl.daddr.v6, &sin6->sin6_addr, sizeof(struct in6_addr));
     pnl.dport = sin6->sin6_port;

src/lib/math/fp.c

@@ -62,12 +62,16 @@ clamp_double_to_int64(double number)
 {
   int exponent;
 
-#if defined(MINGW_ANY) && GCC_VERSION >= 409
+#if (defined(MINGW_ANY)||defined(__FreeBSD__)) && GCC_VERSION >= 409
 /*
   Mingw's math.h uses gcc's __builtin_choose_expr() facility to declare
   isnan, isfinite, and signbit.  But as implemented in at least some
   versions of gcc, __builtin_choose_expr() can generate type warnings
   even from branches that are not taken.  So, suppress those warnings.
+
+  FreeBSD's math.h uses an __fp_type_select() macro, which dispatches
+  based on sizeof -- again, this can generate type warnings from
+  branches that are not taken.
 */
 #define PROBLEMATIC_FLOAT_CONVERSION_WARNING
 DISABLE_GCC_WARNING(float-conversion)