From 6aa2fe8969e275faa2fbd6e80ebfb91ac2bddc40 Mon Sep 17 00:00:00 2001
From: Bryan Drewery <bdrewery@FreeBSD.org>
Date: Mon, 26 Oct 2015 19:28:20 +0000
Subject: [PATCH] Add a note about DEPFLAGS which is currently a hack around
 not properly passing CXXFLAGS to sub-makes.

The bad passing also causes bsd.dep.mk's logic to selectively pull only some
flags from C[XX]FLAGS to not apply which can be seen with '-L' being passed to
mkdep when using an external compiler.
---
 Makefile.inc1 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Makefile.inc1 b/Makefile.inc1
index b06c9b7964d..275b8a343e7 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -398,6 +398,9 @@ TARGET_ABI=	gnueabi
 .if defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == gcc
 XCFLAGS+=	-isystem ${WORLDTMP}/usr/include -L${WORLDTMP}/usr/lib
 XCXXFLAGS+=	-I${WORLDTMP}/usr/include/c++/v1 -std=gnu++11 -L${WORLDTMP}/../lib/libc++
+# XXX: DEPFLAGS is a workaround for not properly passing CXXFLAGS to sub-makes
+# due to CXX="${XCXX} ${XCXXFLAGS}".  bsd.dep.mk does use CXXFLAGS when
+# building C++ files so this can come out if passing CXXFLAGS down is fixed.
 DEPFLAGS+=	-I${WORLDTMP}/usr/include/c++/v1
 .else
 TARGET_ABI?=	unknown