[PATCH v2 02/19] bsd-user: Ifdef a few MAP_ constants for NetBSD / OpenBSD.

[Warner Losh <imp@bsdimp.com>]

MAP_GUARD, MAP_EXCL, and MAP_NOCORE are FreeBSD only. Define them to be
0 if they aren't defined, and rely on the compiler to optimize away
sections not relevant. Added only to the top of mmap.c since that's the
only place we need this.

Signed-off-by: Warner Losh <imp@bsdimp.com>
---
 bsd-user/mmap.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
index d6c5a344c9b..2d91e8e8826 100644
--- a/bsd-user/mmap.c
+++ b/bsd-user/mmap.c
@@ -20,6 +20,20 @@
 
 #include "qemu.h"
 
+/*
+ * Not all the BSDs have all the MAP flags, so define some of them to 0 here and
+ * rely on the compiler optimizing always false conditions away.
+ */
+#ifndef MAP_GUARD
+#define MAP_GUARD 0
+#endif
+#ifndef MAP_EXCL
+#define MAP_EXCL 0
+#endif
+#ifndef MAP_NOCORE
+#define MAP_NOCORE 0
+#endif
+
 static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
 static __thread int mmap_lock_count;
 
-- 
2.40.0