Add a port for the Solaris Modular Debugger (mdb).

Currently it only supports debugging of FreeBSD/amd64 kernels via kernel
crashes (vmcores) or live systems via /dev/mem.  It does not include a
port of the in-kernel kmdb debugger.

PR:		220891
Reviewed by:	mat
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D11682

devel/Makefile

@@ -1637,6 +1637,7 @@
     SUBDIR += maven31
     SUBDIR += maven33
     SUBDIR += mcpp
+    SUBDIR += mdb
     SUBDIR += mdds
     SUBDIR += memleax
     SUBDIR += menhir

devel/mdb/Makefile

@@ -0,0 +1,36 @@
+# $FreeBSD$
+
+PORTNAME=	mdb
+PORTVERSION=	0.1
+CATEGORIES=	devel
+
+MAINTAINER=	jhb@FreeBSD.org
+COMMENT=	Solaris Modular Debugger
+
+LICENSE=	CDDL
+
+USES=		uidfix
+
+USE_GITHUB=	yes
+GH_ACCOUNT=	bsdjhb
+GH_PROJECT=	illumos-gate
+GH_TAGNAME=	b8a73a7590
+
+ONLY_FOR_ARCHS=	amd64
+
+MAKE_ARGS=	WITH_CTF=yes
+MAKE_ARGS+=	BINDIR=${PREFIX}/bin
+MAKE_ARGS+=	LIBDIR=${PREFIX}/lib
+WRKSRC_SUBDIR=	freebsd/cddl/usr.bin/mdb
+CFLAGS+=	-DMDB_PREFIX=\\\"${PREFIX}\\\" -g
+
+.include <bsd.port.pre.mk>
+
+.if !exists(${SRC_BASE}/cddl/compat) || !exists(${SRC_BASE}/sys/cddl/compat)
+IGNORE=		requires full source tree with CDDL sources
+.endif
+
+pre-install:
+	${MKDIR} ${STAGEDIR}${PREFIX}/lib/mdb/kvm/${MACHINE_ARCH}
+
+.include <bsd.port.post.mk>

devel/mdb/distinfo

@@ -0,0 +1,3 @@
+TIMESTAMP = 1500586203
+SHA256 (bsdjhb-illumos-gate-0.1-b8a73a7590_GH0.tar.gz) = 6fe907ac8c107400ccf68ed4dc240b35361e14e18ddac571e554c261d46f758c
+SIZE (bsdjhb-illumos-gate-0.1-b8a73a7590_GH0.tar.gz) = 115104723

devel/mdb/pkg-descr

@@ -0,0 +1,6 @@
+This is a port of the Solaris Modular Debugger to FreeBSD.  Currently it
+only supports debugging of FreeBSD/amd64 kernels via kernel crashes
+(vmcores) or live systems via /dev/mem.  It does not include a port of the
+in-kernel kmdb debugger.
+
+WWW: https://docs.oracle.com/cd/E19683-01/806-6545/index.html

devel/mdb/pkg-plist

@@ -0,0 +1,4 @@
+bin/mdb
+lib/mdb/kvm/amd64/kernel.so
+lib/mdb/kvm/amd64/kld.so
+lib/mdb/kvm/amd64/mdb_ks.so