[source] build: introduce default HOST_MAKE_VARS for host-builds

[LEDE Commits]

jow pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/83c9bfad1e8a76e04efe8b540b404a2148374333

commit 83c9bfad1e8a76e04efe8b540b404a2148374333
Author: Alexandru Ardelean <ardeleanalex at gmail.com>
AuthorDate: Mon Jan 9 14:59:02 2017 +0200

    build: introduce default HOST_MAKE_VARS for host-builds
    
    Inspired/adapted from `package-defaults.mk` MAKE_VARS.
    
    Signed-off-by: Alexandru Ardelean <ardeleanalex at gmail.com>
---
 include/host-build.mk | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/host-build.mk b/include/host-build.mk
index 5cfbdeb..c54ee37 100644
--- a/include/host-build.mk
+++ b/include/host-build.mk
@@ -67,6 +67,11 @@ HOST_CONFIGURE_ARGS = \
 	--localstatedir=$(HOST_BUILD_PREFIX)/var \
 	--sbindir=$(HOST_BUILD_PREFIX)/bin
 
+HOST_MAKE_VARS = \
+	CFLAGS="$(HOST_CFLAGS)" \
+	CXXFLAGS="$(HOST_CPPFLAGS)" \
+	LDFLAGS="$(HOST_LDFLAGS)"
+
 HOST_MAKE_FLAGS =
 
 HOST_CONFIGURE_CMD = $(BASH) ./configure
@@ -89,7 +94,8 @@ define Host/Configure
 endef
 
 define Host/Compile/Default
-	+$(MAKE) $(HOST_JOBS) -C $(HOST_BUILD_DIR) \
+	+$(HOST_MAKE_VARS) \
+	$(MAKE) $(HOST_JOBS) -C $(HOST_BUILD_DIR) \
 		$(HOST_MAKE_FLAGS) \
 		$(1)
 endef