From 469884765efe2df126f6242ed1b4c77df412a655 Mon Sep 17 00:00:00 2001
From: John Baldwin <jhb@FreeBSD.org>
Date: Mon, 9 Dec 2019 18:58:14 +0000
Subject: MFH: r518116

Use clang 7 as compiler on 11.x and 12.x to fix build.

clang 8 and later error for duplicate definitions of enum values.  mdb
depends on having identical but duplicate definitions.  This was fixed
differently in 13 with a change to the kernel, but that change is
disruptive and cannot be easily backported.

Reported by:	pkg-fallout, Attila Nagy
Approved by:	bdrewery
Differential Revision:	https://reviews.freebsd.org/D22486

Approved by:	ports-secteam (joneum)
---
 devel/mdb/Makefile | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/devel/mdb/Makefile b/devel/mdb/Makefile
index 1e5968658d48..bc73a80b5fa2 100644
--- a/devel/mdb/Makefile
+++ b/devel/mdb/Makefile
@@ -9,7 +9,7 @@ COMMENT=	Solaris Modular Debugger
 
 LICENSE=	CDDL
 
-USES=		uidfix
+USES=		compiler uidfix
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	bsdjhb
@@ -31,6 +31,15 @@ CFLAGS+=	-DMDB_PREFIX=\\\"${PREFIX}\\\" -g
 IGNORE=		requires full source tree with CDDL sources
 .endif
 
+.if ${OSVERSION} < 1300015 && ${COMPILER_TYPE} == "clang" && \
+    ${COMPILER_VERSION} >= 80
+# clang 8 cannot compile due to enum redefinitions in kernel.h
+BUILD_DEPENDS+=	${LOCALBASE}/bin/clang70:devel/llvm70
+CPP=	${LOCALBASE}/bin/clang-cpp70
+CC=	${LOCALBASE}/bin/clang70
+CXX=	${LOCALBASE}/bin/clang++70
+.endif
+
 pre-install:
 	${MKDIR} ${STAGEDIR}${PREFIX}/lib/mdb/kvm/${MACHINE_ARCH}
 
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