Support dynamically-linked NetBSD libc when cross-compiling

.gitattributes

@@ -3,6 +3,8 @@
 *.txt text eol=lf
 langref.html.in text eol=lf
 
+lib/libc/*/abilists binary
+
 lib/std/compress/testdata/** binary
 lib/std/compress/flate/testdata/** binary
 lib/std/compress/lzma/testdata/** binary

CMakeLists.txt

@@ -588,6 +588,7 @@ set(ZIG_STAGE2_SOURCES
     src/dev.zig
     src/libs/freebsd.zig
     src/libs/glibc.zig
+    src/libs/netbsd.zig
     src/introspect.zig
     src/libs/libcxx.zig
     src/libs/libtsan.zig

lib/libc/include/aarch64-netbsd-none/aarch64/ansi.h

@@ -0,0 +1,3 @@
+/* $NetBSD: ansi.h,v 1.1 2014/08/10 05:47:37 matt Exp $ */
+
+#include <arm/ansi.h>

lib/libc/include/aarch64-netbsd-none/aarch64/aout_machdep.h

@@ -0,0 +1,37 @@
+/* $NetBSD: aout_machdep.h,v 1.2 2018/04/01 04:35:03 ryo Exp $ */
+
+/*-
+ * Copyright (c) 2014 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Matt Thomas of 3am Software Foundry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _AARCH64_AOUT_MACHDEP_H_
+#define	_AARCH64_AOUT_MACHDEP_H_
+
+#include <arm/aout_machdep.h>
+
+#endif /* !_AARCH64_AOUT_MACHDEP_H_ */