From 40418c3c021f381ac83ab483156caed98393f792 Mon Sep 17 00:00:00 2001
From: bdrewery <bdrewery@FreeBSD.org>
Date: Fri, 3 Mar 2017 21:46:30 +0000
Subject: MFC r313907:

  xdev: Fix after libc++ update in r300873.
---
 Makefile.inc1 | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/Makefile.inc1 b/Makefile.inc1
index 5be4d30..797140a 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -2461,10 +2461,25 @@ CDBENV=MAKEOBJDIRPREFIX=${MAKEOBJDIRPREFIX}/${XDDIR} \
 	INSTALL="sh ${.CURDIR}/tools/install.sh"
 CDENV= ${CDBENV} \
 	TOOLS_PREFIX=${XDTP}
-CD2CFLAGS=-isystem ${XDDESTDIR}/usr/include -L${XDDESTDIR}/usr/lib \
-	--sysroot=${XDDESTDIR}/ -B${XDDESTDIR}/usr/libexec \
-	-B${XDDESTDIR}/usr/bin -B${XDDESTDIR}/usr/lib
-CD2ENV=${CDENV} CC="${CC} ${CD2CFLAGS}" CXX="${CXX} ${CD2CFLAGS}" \
+
+.if ${WANT_COMPILER_TYPE} == gcc || \
+    (defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == gcc)
+# GCC requires -isystem and -L when using a cross-compiler.  --sysroot
+# won't set header path and -L is used to ensure the base library path
+# is added before the port PREFIX library path.
+CD2CFLAGS+=	-isystem ${XDDESTDIR}/usr/include -L${XDDESTDIR}/usr/lib
+# GCC requires -B to find /usr/lib/crti.o when using a cross-compiler
+# combined with --sysroot.
+CD2CFLAGS+=	-B${XDDESTDIR}/usr/lib
+# Force using libc++ for external GCC.
+# XXX: This should be checking MK_GNUCXX == no
+.if ${X_COMPILER_VERSION} >= 40800
+CD2CXXFLAGS+=	-isystem ${XDDESTDIR}/usr/include/c++/v1 -std=c++11 \
+		-nostdinc++
+.endif
+.endif
+CD2CFLAGS+=	--sysroot=${XDDESTDIR}/
+CD2ENV=${CDENV} CC="${CC} ${CD2CFLAGS}" CXX="${CXX} ${CD2CXXFLAGS} ${CD2CFLAGS}" \
 	CPP="${CPP} ${CD2CFLAGS}" \
 	MACHINE=${TARGET} MACHINE_ARCH=${TARGET_ARCH}
 
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