Enable building tar for non-FreeBSD host

For DIRDEPS_BUILD we need Makefile.depend.options to
force libegacy to be built on older FreeBSD and non-FreeBSD hosts.

Add readpassphrase to libegacy to avoid the need for libbsd on Linux

src.opts.mk disable TESTS for host if MK_host_egacy is yes

Reviewed by:	imp
Sponsored by:	Juniper Networks, Inc.
Differential Revision:	https://reviews.freebsd.org/D39766

lib/libarchive/config_freebsd.h

@@ -100,7 +100,9 @@
 #define HAVE_DIRENT_H 1
 #define HAVE_DIRFD 1
 #define HAVE_DLFCN_H 1
+#ifndef __linux__
 #define HAVE_D_MD_ORDER 1
+#endif
 #define HAVE_EFTYPE 1
 #define HAVE_EILSEQ 1
 #define HAVE_ERRNO_H 1

share/mk/src.opts.mk

@@ -360,6 +360,12 @@ __DEFAULT_YES_OPTIONS+=NETLINK_SUPPORT
 __DEFAULT_NO_OPTIONS+=NETLINK_SUPPORT
 .endif
 
+# MK_host_egacy is set by local.sys.mk so is valid here
+.if ${MACHINE} == "host" && ${MK_host_egacy} == "yes"
+# we cannot expect tests to work
+BROKEN_OPTIONS+= TESTS
+.endif
+
 .-include <site.src.opts.mk>
 
 .include <bsd.mkopt.mk>

tools/build/Makefile

@@ -208,6 +208,18 @@ CFLAGS.closefrom.c+=	-DSTDC_HEADERS -DHAVE_SYS_DIR_H -DHAVE_DIRENT_H \
 SRCS+=	progname.c
 # Stub implementations of fflagstostr/strtofflags
 SRCS+=	fflags.c
+
+# tar needs readpassphrase
+# the version from openssh is already "portable"
+# but we need to take care with .PATH as we
+# do not want getopt_long.c from crypto/openssh/openbsd-compat
+# and we do not want readpassphrase.c from libc/gen
+.PATH: ${SRCTOP}/crypto/openssh
+OBJS_SRCS_FILTER= T R
+SRCS+=	openbsd-compat/readpassphrase.c
+
+INCS+=		${SRCTOP}/crypto/openssh/openbsd-compat/readpassphrase.h
+
 .endif # ${MAKE.OS} == "Linux"
 
 .if ${.MAKE.OS} == "Darwin"

tools/build/cross-build/include/linux/includes.h

@@ -0,0 +1,4 @@
+#include <sys/cdefs.h>
+#include <paths.h>
+
+#define DEF_WEAK(a)

usr.bin/tar/Makefile.depend.host

@@ -0,0 +1,11 @@
+# $FreeBSD$
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif

usr.bin/tar/Makefile.depend.options

@@ -0,0 +1,6 @@
+DIRDEPS_OPTIONS = host_egacy
+
+DIRDEPS.host_egacy.yes = tools/build
+
+.include <dirdeps-options.mk>
+