Merge pull request #16527 from swift-nav/silverjam/buildroot-cross-compile

Don't overwrite HOST_* make variables

Makefile

@@ -478,11 +478,11 @@ LDFLAGS += $(EXTRA_LDFLAGS)
 DEFINES += $(EXTRA_DEFINES)
 LDLIBS += $(EXTRA_LDLIBS)
 
-HOST_CPPFLAGS = $(CPPFLAGS)
-HOST_CFLAGS = $(CFLAGS)
-HOST_CXXFLAGS = $(CXXFLAGS)
-HOST_LDFLAGS = $(LDFLAGS)
-HOST_LDLIBS = $(LDLIBS)
+HOST_CPPFLAGS += $(CPPFLAGS)
+HOST_CFLAGS += $(CFLAGS)
+HOST_CXXFLAGS += $(CXXFLAGS)
+HOST_LDFLAGS += $(LDFLAGS)
+HOST_LDLIBS += $(LDLIBS)
 
 # These are automatically computed variables.
 # There shouldn't be any need to change anything from now on.

templates/Makefile.template

@@ -345,11 +345,11 @@
   ${arg} += $(EXTRA_${arg})
   % endfor
 
-  HOST_CPPFLAGS = $(CPPFLAGS)
-  HOST_CFLAGS = $(CFLAGS)
-  HOST_CXXFLAGS = $(CXXFLAGS)
-  HOST_LDFLAGS = $(LDFLAGS)
-  HOST_LDLIBS = $(LDLIBS)
+  HOST_CPPFLAGS += $(CPPFLAGS)
+  HOST_CFLAGS += $(CFLAGS)
+  HOST_CXXFLAGS += $(CXXFLAGS)
+  HOST_LDFLAGS += $(LDFLAGS)
+  HOST_LDLIBS += $(LDLIBS)
 
   # These are automatically computed variables.
   # There shouldn't be any need to change anything from now on.